Updated on 2024/02/02

写真a

 
SHIOTA Tadashi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
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Degree

  • Doctor of Engineering ( Osaka University )

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Machine elements and tribology

  • Nanotechnology/Materials / Thin film/surface and interfacial physical properties

  • Nanotechnology/Materials / Structural materials and functional materials

Education

  • Osaka University   大学院工学研究科   物質・生命工学専攻

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    Notes： 博士後期課程

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Research History

  • Okayama University   The Graduate School of Natural Science and Technology   Associate Professor

    2018.4

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  • Tokyo Institute of Technology   School of Materials and Chemical Technology   Assistant Professor

    2016.4 - 2018.3

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  • Leiden University   カマリン・オンネス研究所

    2010.3 - 2010.8

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  • Tokyo Institute of Technology   Graduate School of Science and Engineering   Assistant Professor

    2007.4 - 2016.3

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  • Universiteit Leiden   Kamerlingh Onnes Laboratorium   Visiting researcher

    2005.2 - 2006.3

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  • Tokyo Institute of Technology   Graduate School of Science and Engineering   Research Assistant

    2001.10 - 2007.3

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  • 科学技術振興事業団   科学技術特別研究員

    2001.1 - 2001.9

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  • 工業技術院 機械技術研究所   特別技術補助職員

    2000.4 - 2000.12

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Professional Memberships

 

Papers

  • Photon Emission Induced by Fracture of Hard Brittle Materials

    SHIOTA Tadashi, YASUDA Kouichi

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   61 ( 8 )   531 - 538   2016

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    Language：Japanese   Publisher：Japanese Society of Tribologists  

    DOI： 10.18914/tribologist.61.8_531

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  • Theoretical Estimation of Changes in Plane Elastic Waves due to Cylindrical Inclusions Reviewed

    Ryoichi Furushima, Yohtaro Matsuo, Tadashi Shiota, Kouichi Yasuda

    JOURNAL OF NONDESTRUCTIVE EVALUATION   30 ( 1 )   29 - 40   2011.3

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER/PLENUM PUBLISHERS  

    Changes in amplitude and phase shifts in plane elastic waves were theoretically estimated when they propagated through an elastic body containing cylindrical inclusions. Based on the integral equation suggested by Lavrov et al., these changes were calculated in the case when only one cylindrical inclusion was located in the body and the propagating waves have a single frequency. These calculations were expanded to more practical case when multiple cylindrical inclusions aligned in the body and the waves have some frequency band. The changes in amplitude and phase shifts calculated were associated to the changes in apparent sonic velocity and attenuation coefficient due to a structural change in the material. This theoretical approach contributes to a quantitative damage evaluation based upon structural changes in various materials by measuring the acoustical parameters such as apparent sonic velocity and attenuation coefficient.

    DOI： 10.1007/s10921-010-0087-z

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  • Grain motion statistics of polycrystalline zirconia during superplastic deformation Reviewed

    Taku Okamoto, Kouichi Yasuda, Tadashi Shiota

    SCRIPTA MATERIALIA   64 ( 3 )   253 - 255   2011.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

    This study focuses on grain motion in tetragonal zirconia polycrystal ceramics during superplastic deformation. Since grains were found to move in a zigzag motion in previous experiments, the present study attempts to analyze the grain motion based on random walk theory. The analysis shows that the zigzag motion results from changes in constraint by surrounding grains. The constraint is spatially distributed at first, and its distribution gradually becomes uniform as superplastic deformation advances. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI： 10.1016/j.scriptamat.2010.10.011

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  • Detection of photon emission during crack propagation in silica glass by fast time-resolved measurement Reviewed

    Yoshitaka Sato, Tadashi Shiota, Kouichi Yasuda

    Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A   77 ( 779 )   1028 - 1031   2011

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    Language：Japanese   Publishing type：Research paper (international conference proceedings)  

    Fast time-resolved measurement was carried out to detect photon emission (PE) during crack propagation in silica glass. The specimen was fractured by three-point bending at room temperature under 10 -4 Pa. The top and bottom surfaces of the specimen were coated with Au. Resistance of those surfaces was monitored to detect crack propagation in the specimen. Simultaneously, the PE was detected with photomultiplier tube. The PE around 650 nm increased and then gradually decreased during the crack propagation, while the strong the PE around 450 nm was observed at the beginning of the crack propagation. Moreover, both of the emissions started just before the onset of the crack propagation. It might be due to micro-cracks leading to a main crack propagation. The result suggests that a fracture precursor can be detected by monitoring the PE. © 2011 The Japan Society of Mechanical Engineers.

    DOI： 10.1299/kikaia.77.1028

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  • Analysis of Fracture Causes in Gadolinia-Doped Ceria Ceramics

    UEMURA Kazuhiro, YASUDA Kouichi, SHIOTA Tadashi

    Transactions of the Japan Society of Mechanical Engineers Series B   77 ( 775 )   535 - 543   2011

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    Publisher：The Japan Society of Mechanical Engineers  

    The aim of this study is to determine fracture causes of GDC ceramics. GDC ceramics were prepared by sintering Ce0.9Gd0.1O2 powder compacts at 1200, 1300, 1400°C for 2 hours in air. To discuss the effect of doping Gd2O3, pure CeO2 ceramics were also made by sintering at 1300°C. The GDC and CeO2 ceramics were cut into specimens of 3×4 ×36 mm3 and the fracture strength was measured by four-point bending test. After the test, fracture origins of the GDC and CeO2 ceramics were identified by SEM fractography. The experimental results suggest that bending strength of GDC was mainly controlled by large pore generated by nonstoichiometry of ceria.

    DOI： 10.1299/kikaia.77.535

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  • Estimation theory for random force exerted on grains during superplastic deformation of ceramics Reviewed

    T. Okamoto, K. Yasuda, T. Shiota

    3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC3): ADVANCED ENGINEERING CERAMICS AND COMPOSITES   18   2011

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IOP PUBLISHING LTD  

    This paper focuses on grain motion during superplastic deformation in TZP (Tetragonal Zirconia Polycrystal) ceramics. After estimation theory for random force was developed, the kinetic data of grains were stochastically analyzed, and random force acting on grains was estimated: At an earlier stage of superplastic deformation, distribution of random force differs between the loading direction and its normal direction. As superplastic deformation advances, however, it becomes identical in two directions. Such the change in the random force is discussed in terms of constraint by surrounding grains.

    DOI： 10.1088/1757-899X/18/20/202007

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  • Simultaneous measurement of the emission of photons and charged particles during fracture of brittle materials Reviewed

    Tadashi Shiota, Kouichi Yasuda

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS   173 ( 1-3 )   248 - 252   2010.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

    Photon emission (PE), positive charge emission (PCE), and negative charge emission (NCE) during fracture, were simultaneously measured in silica glass, single-crystal MgO, and polycrystalline MgO, Al(2)O(3) and ZrO(2). The decay behavior strongly depended on materials. Especially, in the silica glass, several bursts of the PCE and NCE coincided in the decay. The NCE count tended to increase with the PCE in all the samples. Moreover, the material having stronger PE exhibited stronger PCE and NCE. Thus, it is found that the time decay and emission count depend on materials. (C) 2010 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.mseb.2010.02.002

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  • TZPセラミックスの超塑性変形における粒子流跡線のブラウン運動に基づく解析

    岡本 拓, 安田公一, 塩田 忠

    日本機械学会論文集A編   76 ( 766 )   680 - 681   2010

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  • S0403-1-2 Theory to estimate random force acting on grains in ceramics superplasticity

    OKAMOTO Taku, YASUDA Kouichi, SHIOTA Tadashi

    The proceedings of the JSME annual meeting   2010   289 - 290   2010

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    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    A motion equation of a Brownian particle is expressed by Generalized Langevin Equation (GLE) which is a stochastic differential equation, and random force in GLE causes zigzag (random walk) motion of the particle. In this study, grain motion during superplastic deformation of ceramics is assumed to be Brownian motion, and random force acting on grains is estimated by solving GLE. From the theoretical approach, we can estimate an auto-correlation function of random force, and also a probability density function of grain motion.

    DOI： 10.1299/jsmemecjo.2010.1.0_289

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  • S0403-1-3 Application of fractography to estimation of strength of porous alumina

    MISAKI Tomoyuki, KOBAYASHI Tomohiro, UEMURA Kazuhiro, SHIOTA Tadashi, NAKA Hironori, OONISHI Hiroshi, YASUDA Kouichi

    The proceedings of the JSME annual meeting   2010   291 - 292   2010

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    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    The fracture strength of porous ceramics has been studied by many researchers. However, there are few approach on determining fracture mechanism. While fractgraphy is often used to estimate fracture mechanism of dense ceramics. So, in this study, fractography is applied to detect fracture origin of porous ceramics. Porous alumina ceramics (with different porosities 12, 22, 28%) were used. The alumina ceramics were cut into specimens of 5 x 8 x 48 mm, and divided into two groups; polished specimens and as-received specimens. Fracture strengths were measured by 3-point bending test. After the test, fracture origins were identified by optical fractography, and classified into 3 types of defect: inner, surface and edge defects. From the results, we concluded that fractography was the useful technique to understand the fracture mechanism of porous ceramics.

    DOI： 10.1299/jsmemecjo.2010.1.0_291

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  • Estimation of the number of cracks generated by compressive stress in polycrystalline graphite using ultrasonic method Reviewed

    R. Furushima, Y. Matsuo, T. Shiota, J. S. Cross, K. Yasuda

    Journal of Physics: Conference Series   191   2009

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Physics Publishing  

    A theory was developed to estimate the change in the apparent sonic velocity in porous ceramics by solving Lavrov's integral equation of the cylindrical inclusion problem. It was shown that the change in apparent sonic velocity was caused by phase shift of the sonic wave. To extend the theory to the case of multiple inclusions, the superposition principle was applied. The theory was verified by analyzing the apparent sonic velocity during a compression test of polycrystalline graphite, and the number of cracks that formed during loading was estimated to be 700, when the dimensions of crack length and width were assumed to be 1mm and 10μm, respectively. © 2009 IOP Publishing Ltd.

    DOI： 10.1088/1742-6596/191/1/012029

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  • Photon emission during fracture of carbon materials

    Kouichi Yasuda, Koji Yamamoto, Tadashi Shiota, Yohtaro Matsuo

    Journal of Vacuum Science and Technology A   27 ( 2 )   187   2009

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  • Asymptotic Characteristic of Exact Distribution of Fracture Strength Based on Gamma Distribution as Initial Flaw Size Distribution

    Chisato WAKABAYASHI, Kouichi YASUDA, Tadashi SHIOTA

    Journal of Solid Mechanics and Materials Engineering   3 ( 2 )   106 - 113   2009

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    Language：English   Publisher：The Japan Society of Mechanical Engineers  

    In this paper, an exact distribution of fracture strength was derived from extreme value statistics for an initial distribution of flaw size, via conversion to an exact distribution of largest flaw size. Gamma distribution was shown as a better function to approximate the initial distribution data measured by immersion liquid technique. The exact distribution of fracture strength was obtained as a function of the number of links in the weakest link theory. With increasing the number of links, the exact distribution gradually became linear on Weibull plot, and almost coincided to Weibull distribution at the number of links larger than 1000. Compared to actual distributions of fracture strength, the number of links in the specimens was estimated to be in the range from 104 to 105. The above discussion showed a verification of this theory.

    DOI： 10.1299/jmmp.3.106

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  • Availability of gamma distribution as initial distribution of flaw size

    Chisato Wakabayashi, Kouichi Yasuda, Tadashi Shiota

    Journal of the Ceramic Society of Japan   117 ( 1362 )   162 - 165   2009

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Ceramic Society of Japan  

    To demonstrate availability of gamma distribution as the initial distribution of flaw size, three kinds of initial flaw size data of alumina ceramics were employed. Compared with a power function, gamma distribution was better fit to the data in every case. For practical use, an approximate expression of the initial distribution of flaw size was proposed by taking out a major part of the gamma distribution relating to the shape parameter. Finally, a positive correlation between the average fracture strength of the alumina ceramics and the shape parameter of the gamma distribution was discussed. © 2009 The Ceramic Society of Japan. All rights reserved.

    DOI： 10.2109/jcersj2.117.162

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  • S0405-1-1 New estimation method of Weibull parameters based on initial distribution of flaw size

    WAKABAYASHI Chisato, YASUDA Kouichi, SHIOTA Tadashi

    The proceedings of the JSME annual meeting   2009   305 - 306   2009

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    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    In this paper, gamma distribution is used as the initial distribution of flaw size, and their parameters are estimated from the flaw size data reported previously. Based on extreme value statistics, an exact distribution of the largest flaw size is derived from the initial distribution of flaw size. This distribution is equal to the distribution of fracture origin size. Since the relation between the fracture origin size and the fracture strength is given by fracture mechanics, an exact distribution of fracture strength is derived from the distribution of the largest flaw size by variable transformation. From the fact that the number of links in the specimens is in the range from 10^4 to 10^6, the parameters of Weibull distribution are obtained from the parameters of the initial distribution of flaw size. Thus, a new estimation method of Weibull parameters is proposed here.

    DOI： 10.1299/jsmemecjo.2009.1.0_305

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  • S0405-1-2 New Evaluation Method for Damage Evolution in Porous Ceramics Based on Nonlinearity in Stress/Strain Curve

    YASUDA Kouichi, FURUSHIMA Ryoichi, ZHANG Rui, SHIOTA Tadashi, MATSUO Yohtaro

    The proceedings of the JSME annual meeting   2009   307 - 308   2009

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    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    This paper describes a new proposal to evaluate damage evolution in porous ceramics according to the present authors' theory. The theory is based on parallel elements model and gives that the second order derivative of a stress/strain curve is proportional to a probability density function of strain at which each element is damaged. Uni-axial compression test was conducted for an insulating brick and its probability density function is obtained from the non-linear stress/strain curve. The function coincides well with acoustic emission data simultaneously measured in the compression test. This fact shows that the theory is useful for quick and brief estimation of damage initiation and its evolution in porous ceramics.

    DOI： 10.1299/jsmemecjo.2009.1.0_307

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  • Random walk analysis of grain motion during superplastic deformation of TZP Reviewed

    T. Okamoto, K. Yasuda, T. Shiota

    Journal of Physics: Conference Series   191   2009

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Physics Publishing  

    This study focuses on grain motion in TZP (Tetragonal Zirconia Polycrystal) ceramics during superplastic deformation. The specimen was 16 times elongated repeatedly at 1400°C in air. The increment of true plastic strain was set to be 2%, and the specimen was deformed up to 30.3% true plastic strain finally. After each deformation, displacement vectors of specified 748 grains were measured from their position vectors determined by FE-SEM micrographs. As a result, the grains move to the tensile loading direction in zigzag way. And also, the zigzag motion changes with plastic strain: The grains move randomly (random walk motion) by the first 15% true plastic strain, and then grain motion becomes spatially uniform gradually. It is related to changes of constraint of surrounding matrix. © 2009 IOP Publishing Ltd.

    DOI： 10.1088/1742-6596/191/1/012004

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  • Estimation of Weibull parameters from parameters of initial distribution of flaw size Reviewed

    C. Wakabayashi, K. Yasuda, T. Shiota

    Journal of Physics: Conference Series   191   2009

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Physics Publishing  

    The distribution of the largest flaw size is derived from the initial distribution of flaw size based on extreme value statistics, and also the distribution of fracture origin size is given by transforming Weibull distribution by fracture mechanical relation. These two distributions are equivalent under uniaxial loading. By using this relation, their parameters are related each other and Weibull parameters are estimated from the parameters of the initial distribution of flaw size and the number of links. © 2009 IOP Publishing Ltd.

    DOI： 10.1088/1742-6596/191/1/012006

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  • Detection of damage initiation and its evolution in insulating brick from non-linearity of stress/strain curve Reviewed

    R. Zhang, K. Yasuda, R. Furushima, T. Shiota

    Journal of Physics: Conference Series   191   2009

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Physics Publishing  

    This paper deals with experimental verification of the present author's theory relating to estimation of damage accumulation in materials showing non-linear stress/strain curves. The theory is based on parallel elements model and gives that the second order derivative of a stress/strain curve is proportional to a probability density function of strain at which each element is damaged. Uni-axial compression test was conducted for an insulating brick and its probability density function is obtained from the non-linear stress/strain curve. The function coincides well with acoustic emission data simultaneously measured in the compression test. This fact shows that the theory is useful for quick and brief estimation of damage initiation and its evolution in insulating bricks. © 2009 IOP Publishing Ltd.

    DOI： 10.1088/1742-6596/191/1/012005

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  • Influence of beta-tricalcium phosphate dispersion on mechanical properties of hydroxyapatite ceramics

    Tadashi Shiota, Mitsuhiro Shibata, Kottichi Yasuda, Yohtaro Matsuo

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   116 ( 1357 )   1002 - 1005   2008.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

    Mechanical properties of hydroxyapatite (HAp) ceramics and HAp/beta-tricalcium phosphate (beta-TCP) composites were measured at room temperature and at 1100 degrees C to investigate influence of the beta-TCP dispersion. HAp powder was synthesized by precipitation method, and the ceramics and its composites were obtained by sintering the powder. The HAp/30%beta-TCP exhibited the best contribution to mechanical properties in this study. The compression test at 1100 degrees C showed that the beta-TCP dispersion reduced yield stress and work hardening of the HAp ceramics. Moreover, it was found that the composites were largely deformed without the change in grain shape and grain size. The result suggests superior superplasticity in the HAp/beta-TCP composites to the HAp ceramics. (c) 2008 The Ceramic Society of Japan. All rights reserved.

    DOI： 10.2109/jcersj2.116.1002

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  • Mechanical properties of Pt monatomic chains

    T. Shiota, A. I. Mares, A. M. C. Valkering, T. H. Oosterkamp, J. M. van Ruitenbeek

    PHYSICAL REVIEW B   77 ( 12 )   125411   2008.3

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

    The mechanical properties of Pt monatomic chains were investigated by a simultaneous measurement of effective stiffness and conductance using our recently developed mechanically controllable break junction technique with a tuning fork as a force sensor. When stretching a monatomic contact (two-atom chain), the stiffness and conductance increases at the early stage of stretching and then decreases just before breaking, which is attributed to a transition of the chain configuration and bond weakening. A statistical analysis was made to investigate the mechanical properties of monatomic chains. The average stiffness shows minima at the peak positions of the length histogram. From this result, we conclude that the peaks in the length histogram are a measure of the number of atoms in the chains and that the chains break from a strained state. Additionally, we find that the smaller the initial stiffness of the chain is, the longer the chain becomes. This shows that softer chains can be stretched longer.

    DOI： 10.1103/PhysRevB.77.125411

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  • Correlation between the flexure strength and the photon emission intensity during fracture on single crystal and polycrystalline MgO Reviewed

    Tadashi Shiota, Kouichi Yasuda, Yohtaro Matsuo

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS   148 ( 1-3 )   230 - 233   2008.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

    The flexure strength and the intensity of the photon emission during fracture were measured to investigate a correlation between them on single crystal and polycrystalline MgO. Prior to the fracture, IR and UV/vis photons were emitted due to the plastic deformation only in the single crystal. At the moment of the fracture, intense IR and UV/vis photon emissions were observed in both of the single crystal and polycrystalline MgO. In the single crystal, the peak emission intensities of the UV/vis and IR photons were positively correlated with the flexure strength. In the polycrystalline MgO, there was no clear correlation between the flexure strength and the UV/vis photon emission intensity, whereas the IR photon emission intensity was weakly and positively correlated with the flexure strength. The result suggests that crack propagation behavior would affect only the UV/vis photon emission during the fracture of MgO. (C) 2007 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.mseb.2007.09.022

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  • Dependence of the particle emission during the fracture of silica glass on its mechanical property Reviewed

    Tadashi Shiota, Kouichi Yasuda, Yohtaro Matsuo

    PROCEEDINGS OF THE 17TH INTERNATIONAL VACUUM CONGRESS/13TH INTERNATIONAL CONFERENCE ON SURFACE SCIENCE/INTERNATIONAL CONFERENCE ON NANOSCIENCE AND TECHNOLOGY   100   2008

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IOP PUBLISHING LTD  

    The emission intensities of photons, negative and positive charges during the fracture of silica glass and its bending strength were measured to investigate a dependence of such particle emission on the mechanical property. The emission intensities of these particles were sharply increased and showed peaks at the moment of the fracture. In the negative and positive charge emissions, there was no clear correlation between the bending strength and the peak emission intensity. In contrast, there was a positive correlation between them in both of the UV/VIS (160 to 650 nm) and IR (640 to 850 nm) photon emissions. Moreover, the ratio of the UV/VIS photon emission intensity to the IR increased with the bending strength. The result in this study suggests that crack propagation behavior as well as the released energy at the fracture would influence the photon emission during the fracture of silica glass.

    DOI： 10.1088/1742-6596/100/7/072041

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  • Estimation of the Maximum Flaw Size and the Fracture Strength Distributions of a Macroscopic Body Taking the Local Flaw-Size Data as an Initial Distribution

    WAKABAYASHI Chisato, MATSUO Yohtaro, YASUDA Kouichi, SHIOTA Tadashi

    Transactions of the Japan Society of Mechanical Engineers Series B   74 ( 737 )   162 - 165   2008

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    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    In this work a new theory for estimating the maximum flaw-size distribution and the fracture strength distribution of a macroscopic ceramic body is presented, without using any fracture data except the fracture toughness. First, Gamma function was selected as the most suitable distribution function for flaw-size. The unknown parameters were estimated using the local flaw-size data obtained by Yao et al. (5) , who used a small thin ceramic specimen. The maximum flaw-size distribution function for a macroscopic ceramic body, which has an arbitrary volume, was derived based on the extreme statistics by taking the local flaw-size data as an initial distribution. Finally, the strength distribution function was derived using fracture mechanics. The validity of this theory was examined by comparing the Weibull parameters estimated from the theory with the experimental ones by Yao et al.

    DOI： 10.1299/kikaia.74.162

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  • Kinematical Analysis of 748 Grains in TZP Ceramics during Superplastic Deformation

    Kouichi Yasuda, Taku Okamoto, Tadashi Shiota, Yohtaro Matsuo

    Journal of Solid Mechanics and Materials Engineering   2 ( 12 )   1497 - 1507   2008

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    Language：English   Publisher：The Japan Society of Mechanical Engineers  

    This paper describes motion of 748 grains during superplastic deformation of TZP (Tetragonal Zirconia Polycrystal) ceramics. In the same way as the latest paper of the present authors, the same TZP specimen was 4 times further deformed at 1673K (=1400°C) in air under tensile loading. The increment of true plastic strain was set to be about 2%, and the final true plastic strain reached 25.3%. After each deformation, a position vector of the same grain was read out from a FE-SEM photograph, and thereby its displacement vector was determined. By changing the increment of true plastic strain in calculation, various displacement vector maps were obtained in consideration of the previous data also. At an increment of about 25% of true plastic strain; most of the grains seem to move along stationary streamlines similar to laminar flow. When we look at the grain motion at increments of about 5%, several tens of grains move to the same direction instantaneously, and therefore a kind of domain is formed at the first loading. In a subsequent deformation, however, the domains gradually disappear and each grain seems to move randomly, indicating that grain motion becomes spatially uniform. At increments of about 2%, convergence and divergence in grain motion gradually diminish with increasing the true plastic strain and this tendency corresponds to the observation at increments of about 5%, although each grain moves in a zigzag way gradually turning to the loading direction. From these results, the grain motion has a similarity to diffusion phenomenon because the observed time period makes a profound effect on the motion. As for time evolution of grain structure, by the first 15% of true plastic strain, local deformation resistance (viz. constraint by neighbor grains) is gradually homogenized, and consequently spatially uniform grain motion is attained leading to superplasticity in TZP ceramics.

    DOI： 10.1299/jmmp.2.1497

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  • Bending Strength Dependence of Fractoluminescence Intensity in Silica Glass, Single Crystal and Polycrystalline MgO

    Shiota Tadashi, Yasuda Kouichi, Matsuo Yohtaro

    Tribology Online   3 ( 5 )   264 - 267   2008

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    Language：English   Publisher：Japanese Society of Tribologists  

    Fractoluminescence (FL) intensity and bending strength were simultaneously measured in silica glass, single crystal and polycrystalline MgO to study dependence of the FL on mechanical properties. In the silica glass, the FL intensity was positively correlated with the bending strength. Also, the positive correlation was found in the single crystal MgO. However, there was not clear dependence in the polycrystalline MgO. This suggests that the FL intensity is connected with the energy released by fracture in glasses and single crystal ceramics, and that grain boundary also contributes to the FL in polycrystalline ceramics.

    DOI： 10.2474/trol.3.264

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  • 1444 Influence of the flaw-size distribution's parameter on the fracture strength in ceramics

    WAKABAYASHI Chisato, MATSUO Yohtaro, YASUDA Kouichi, SHIOTA Tadashi

    The proceedings of the JSME annual meeting   2008   295 - 296   2008

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    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    In this report, gamma distribution is used for flaw size distribution, and their parameters are estimated by the most likelihood method by using the flaw size data reported by Nakamura et.al. Taking the logarithms of its probability density function, a term in proportion to the flaw size is several orders of magnitude larger than the other terms. Therefore, linearization of flaw size distribution can be made by neglecting the other terms. To compare the experimental data, the gamma distribution parameters are used for the linearization, so this parameter expresses the character of flaw size distribution well. To consider about the relation between the fracture strength and flaw size distribution, the fracture strength and the shape parameter of gamma distribution are discussed.

    DOI： 10.1299/jsmemecjo.2008.1.0_295

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  • 1441 Elastic Analysis around an Arbitrary-shaped Inclusion with Interlayer

    TEMMYO Kan, YASUDA Kouichi, SHIOTA Tadashi, Matsuo Yohtaro

    The proceedings of the JSME annual meeting   2008   289 - 290   2008

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    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    This study deals with stress analysis for an arbitrary-shaped inclusion with interlayer under out-of-plane shear loading. The elastic analytical solution is derived by the two-dimensional elastic-theory in complex number expression. Here, boundaries of the arbitrary-shaped inclusion and interlayer in physical plane are mapped into concentric circles in mapping plane by conformal mapping. And the stress function in mapping plane is given by analytical continuation. Using this stress function, stress distribution around the inclusion in physical plane are shown by numerical simulation as several examples.

    DOI： 10.1299/jsmemecjo.2008.1.0_289

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  • Damage evaluation of refractories under cyclic loading-unloading processes using ultrasonic method

    Ryoichi Furushima, Yohtaro Matsuo, Tadashi Shiota, Kouichi Yasuda

    JOURNAL OF MATERIALS SCIENCE   42 ( 20 )   8652 - 8661   2007.10

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    Accumulation of damage by cyclic loading-unloading under uni-axial compressive stress was evaluated using ultrasonic method for two kinds of refractories: alumina/graphite (AG) and isotropic graphite (IG) refractories. Change of relative degradation in apparent sonic velocity V-RD was used for a barometer on damage evaluation of IG and AG refractories. Measurement of change in V-RD actualizes in-situ evaluation of damage during loading-unloading processes. Difference of change in V-RD during loading-unloading processes was observed between both specimens, which suggested the damage mechanism is different in IG and AG. Accumulation of damage for AG specimens by cyclic loading-unloading was very little, while it is a little larger for IG specimens. An increase in applied stress ratio R contributed to an increase in degree of damage accumulation. To explain the damage mechanism for both AG and IG specimens, we consider damage models, respectively. In these models, loading-unloading processes were classified into 4 steps based on the behavior of change in V-RD, and damage of the two kinds of specimens was explained by relating to crack nucleation and crack opening-closing mechanism in each step.

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  • Photoinduced surface roughness variation in polycrystalline TiO2 thin films under different atmospheres

    Naoki Arimitsu, Akira Nakajima, Ken-Ichi Katsumata, Tadashi Shiota, Toshiya Watanabe, Naoya Yoshida, Yoshikazu Karneshima, Kiyoshi Okada

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   190 ( 1 )   53 - 57   2007.7

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    For this study, we evaluated photoinduced surface roughness variation of polycrystalline anatase thin films under different atmospheres using atomic force microscopy (AFM). A TiO2 thin film with large grains was prepared using the sol-gel process and vacuum ultraviolet (VUV) irradiation before firing. Upon UV illumination, the surface image became blurred with an apparent surface roughness increase in ambient air. The appearance of this image change was delayed in dry air, and was not observed in dry nitrogen. These results imply that this photoinduced surface change is related to water adsorption from the atmosphere. (c) 2007 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.jphotochem.2007.03.013

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  • Evaluation of damage for alumina/graphite refractory using apparent sonic velocity measurement Reviewed

    Ryoichi Furushima, Yohtaro Matsuo, Tadashi Shiota, Kouichi Yasuda

    INNOVATION IN CERAMICS SCIENCE AND ENGINEERING   352   31 - +   2007

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    Damage evaluation for alumina/graphite refractory was conducted under uni-axial compressive loading. Apparent sonic velocity during a loading-unloading cycle was measured by ultrasonic method. Quasi-elastic-plastic behavior was observed in the stress-strain curve for each cycle. However, it is difficult to detect damage from the stress-strain curve during each loading- unloading cycle. On the other hand, using the result of change in apparent sonic velocity during a loading-unloading cycle, it is possible to estimate damage to some extent. The apparent sonic velocity kept approximately constant during the first loading process, but it decreased remarkably during the first unloading one. In the subsequent loading-unloading cycles, it increased in the loading process and decreased in the unloading one. Consequently, it is concluded that damage mechanism during the first loading-unloading cycle is different from that during the subsequent loading-unloading cycles for alumina/graphite refractory.

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  • The role of strength, fracture cause, and fracture location data on the reliability analysis of ceramics Reviewed

    Yohtaro Matsuo, Tadashi Shiota, Kouichi Yasuda, Kazuyuki Suzuki

    INNOVATION IN CERAMICS SCIENCE AND ENGINEERING   352   17 - +   2007

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    Strength reliability of ceramics depends on accuracy of parameters involved in the probability distribution function for fracture. The parameters are usually estimated by use of strength data. However, one may have additional information in the experiment, such as fracture cause data, fracture location data, flaw-size data and flaw-orientation data. In this paper, we will incorporate these additional information in the parameter estimation to improve the accuracy of the reliability. A new theory on the asymptotic variances is presented.

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  • OPTICAL MICROSCOPY OF MULTIPLE MATRIX CRACKING IN A CARBON FIBER-REINFORCED GLASS MATRIX COMPOSITE Reviewed

    Kouichi Yasuda, Koji Hashimoto, Tadashi Shiota, Yohtaro Matsuo

    FRACTOGRAPHY OF GLASSES AND CERAMICS V   199   93 - 103   2007

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    This paper treats the spatial distribution of multiple matrix cracking in fiber-reinforced ceramics matrix composites. In-situ observation was carried out on a carbon fiber-reinforced PYREX glass composite on tensile loading, and the spatial distribution of the matrix cracks was determined by a compare check on its optical micrographs. A stochastic model is developed with an assumption that a new matrix crack is generated only in the effective cell in which the matrix stress remains uniformly high. As compared with the experimental data, the average position of the matrix cracks in the effective cell coincides well with the prediction by the theory; however, the standard deviation is still slightly different from it. The discrepancy is discussed in relation to the underestimation of the effective cell size.

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  • Recombinant domain movement mechanism in superplastic deformation of TZP ceramics

    Kouichi Yasuda, Taku Okamoto, Tadashi Shiota, Yohtaro Matsuo

    Materials Science and Engineering A   418 ( 1-2 )   115 - 119   2006.2

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    High-temperature tensile tests were repeatedly carried out for a tetragonal zirconia polycrystals (TZP) specimen, and the position vectors of 500 grains were measured by FE-SEM image analysis. The displacement vector map showed that several grains moved to the same direction and a kind of domain was formed
    these domains (several micrometer in size) moved in the sea of randomly moving grains
    however, these domains were soon constrained by the surrounding sea and disappeared
    subsequently, new domains were formed in other places by re-combination of grains in order to continue superplastic deformation. Based on these phenomena, the authors proposed a new deformation mechanism called "Recombinant Domain Movement" in this paper. © 2005 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.msea.2005.11.034

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  • Gas pressure dependence of photon emission accompanying fracture of polycrystalline MgO in nitrogen

    Tadashi Shiota, Yasuo Toyoshima, Kouichi Yasuda, Yohtaro Matsuo

    SCIENCE OF ENGINEERING CERAMICS III   317-318   313 - 316   2006

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    The photon emission accompanying fracture of a polycrystal line MgO was investigated at room temperature under N-2 gas pressures from 10(-4) to 10(5) Pa. At fracture, the ultraviolet, visible and infrared photon emissions instantaneously increased, and then rapidly decreased in most of the experimental conditions. However, in a N-2 gas pressure of around 100 Pa, their peak counts lasted for about 10 milliseconds, and the amount of the UV photon emission was fifteen times larger than those obtained in the other N-2 gas pressures. This abrupt increment in the emission was explained by the luminescence due to N-2 gas discharge according to the classical Townsend's theory. In conclusion, the photon emission accompanying fracture of a polycrystalline MgO mainly originated from the excited defects as reported by the authors previously, but the N-2 gas discharge had a supplementary effect on the emission around a specific N-2 gas pressure.

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  • Measurement of Displacement Vector of Grains in Polycrystalline ZrO2 during High-temperature Deformation

    Taku Okamoto, Kouichi Yasuda, Tadashi Shiota, Yohtaro Matsuo

    Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A   72 ( 719 )   1080 - 1087   2006

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    High-temperature tensile tests were repeatedly conducted for a TZP specimen at 1 400°C in air at intervals of about 2% of the true plastic strain up to 17.4%. After each deformation, displacement vectors of the specified 760 grains were measured from their position vectors obtained by FE-SEM micrographs. In a short time period during plastic deformation, grains moved gradually turing to the tensile axis in a zigzag way. At an early stage of deformation, the length of displacement vector distributed in a wide range because of their initial configuration after sintering. Further plastic deformation, however, grains tended to have their own movements depending on the constraint of the surroundings. In a middle time period during plastic deformation, a group of grains moved to the same direction so that several domains were formed. However, the domains disappeared due to constraint by the surrounding matrix, and other domains were formed by re-combination of grains. In a long time period during plastic deformation, grains seemed to be moving along path lines of a non-compressive fluid subjected to uniaxial tensile loading. © 2006, The Japan Society of Mechanical Engineers. All rights reserved.

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  • Effect of microstructure on photoinduced hydrophilicity of transparent anatase thin films

    Ken-Ichi Katsumata, Akira Nakajima, Hidemi Yoshikawa, Tadashi Shiota, Naoya Yoshida, Toshiya Watanabe, Yoshikazu Kameshima, Kiyoshi Okada

    Surface Science   579 ( 2-3 )   123 - 130   2005.4

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    In the current work, we demonstrate the effect of the microstructure of polycrystalline TiO2 thin films prepared by the sol-gel process on the film's photoinduced hydrophilicity. The TiO2 thin films were prepared with different microstructures but almost the same crystal phase, band gap, film thickness and surface roughness. These films were prepared from the same starting materials, and the surface microstructure was changed by vacuum ultraviolet (VUV) irradiation before firing. The VUV-treated film possessed more heterogeneous microstructure (larger grains) than the non-VUV-treated film. The non-VUV-treated film exhibited a higher hydrophilicizing rate under UV irradiation than the VUV-treated film. Friction force microscopy (FFM) revealed that the relative area of the bright region, namely the hydrophilic region, increased in both films under UV irradiation. However, this contrast change is more homogeneous and remarkable in the non-VUV-treated film than in the VUV-treated film. © 2005 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.susc.2005.01.035

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  • 2325 Strength Distribution Function of Ceramics after Surface Strengthening and Non-destructive Inspection

    MATSUO Yohtaro, SHIOTA Tadashi, YASUDA Kouichi

    The proceedings of the JSME annual meeting   2005   711 - 712   2005

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    A statistical theory of strength for surface strengthened ceramics is proposed based on the fracture statistics and the theory of non-destructive inspection developed by the authors in the previous papers. The strength distribution function of ceramics after surface strengthening was proposed. It was found that there is one-to-one correspondence between surface strengthening and realistic non-destructive inspection if some conditions are fulfilled. A reliability design for surface strengthened ceramics is presented.

    DOI： 10.1299/jsmemecjo.2005.1.0_711

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  • 2319 Theory of the Total Dissipation Energy Accompanying Fracture of Fiber-reinforced Ceramics Composites

    YASUDA Kouichi, MATSUO Yohtaro, SHIOTA Tadashi

    The proceedings of the JSME annual meeting   2005   699 - 700   2005

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    The total dissipation energy accompanying fracture of fiber-reinforced ceramics composites was formulated based on energetics of microfracture processes (viz. interfacial debonding and fiber pullout processes) and also Oh and Finnie's fracture location theory. The theory shows us the total dissipation energy of the composites strongly depends on the shape and scale parameters of Weibull distribution of fiber strength and also fiber/matrix interfacial frictional stress. The theoretical prediction gives a close approximation of the experimental fracture energy values of a C/C composite heat-treated at different temperatures.

    DOI： 10.1299/jsmemecjo.2005.1.0_699

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  • The surface potential of the Si nanostructure on a Si (1 1 1) 7 × 7 surface generated by contact of a cantilever tip

    T. Shiota, K. Nakayama

    Applied Surface Science   202 ( 3-4 )   218 - 222   2002.12

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    A Si microstructure on a Si (1 1 1) 7 × 7 surface was investigated by a noncontact atomic force microscopy (ncAFM) and a scanning Kelvin probe microscopy (SKPM) in ultra high vacuum. The Si microstructure was generated by intermittent contact of a cantilever tip. It was found by the ncAFM and SKPM observations that the Si mound with a height of 1 Å and a width of 30 nm was generated, and the surface potential of the small mound was 0.1 V lower than that of the 7 × 7 domain. A quenched Si (1 1 1) surface was also observed by the ncAFM and SKPM. The differences in height and potential between the reconstructed 7 × 7 and the disordered 1 × 1 domains were about 1 Å and 0.1 V, respectively. Therefore, it was concluded that there appeared the disordered 1 × 1 structure on the surface of the Si small mound, lowering the surface potential by 0.1 V. © 2002 Elsevier Science B.V. All rights reserved.

    DOI： 10.1016/S0169-4332(02)00926-1

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  • Atom-resolved imaging of the potential distribution at Si (111) 7 x 7 surfaces

    T Shiota, K Nakayama

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS   41 ( 10B )   L1178 - L1180   2002.10

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    Si (111) 7 x 7 surfaces were observed at an atomic scale by noncontact atomic force microscope (neAFM) and scanning Kelvin probe microscopy (SKPM). A vacancy at the Si Surface was resolved by both ncAFM and SUM, This indicates that SKPM, as well as ncAFM, has a true atomic-scale lateral resolution. In the atom-resolved SKPM observations, two types of contrast were acquired even when the observation conditions were the same except for the surface condition of a cantilever tip. The result experimentally revealed that the contrast of all atom-resolved SKPM image strongly depended on the surface condition of the probe tip.

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  • Computational study of the effect of surface defects and steps on field-stimulated exoelectron emission from aluminum

    T Shiota, M Morita, M Umeno, N Shima, M Tagawa, N Ohmae

    PHYSICAL REVIEW B   65 ( 16 )   165430 - 165433   2002.4

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    The electronic structures of a clean Al (001) surface, of a stepped Al (001) surface, and of an Al(001) surface with vacancies were investigated by the first-principles calculation to elucidate the emission mechanism of field-stimulated exoelectrons from Al tip surfaces. The results show that vacancies at the Al (001) surface slightly increase local density of states (LDOS) in the occupied states, and that monoatomic steps significantly increase LDOS at 0.36 eV above Fermi level in the unoccupied states. The LDOS peak position in the unoccupied states at the stepped surface is close to the trap level of field-stimulated exoelectrons measured in our previous experiments, and it is concluded that the monoatomic steps at Al surfaces can play a role of exoelectron traps.

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  • Direct observation of the field-stimulated exoemission sites at tungsten surfaces using field ion microscopy

    T Shiota, M Umeno, K Dohkuni, M Tagawa, N Ohmae

    JOURNAL OF APPLIED PHYSICS   89 ( 9 )   5177 - 5182   2001.5

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    The spatial distribution of the field-stimulated exoemission (FSEE) from the W tip surface annealed at 800 K for 600 s and the atomic arrangement of the emitting surface were correlated using field ion microscopy (FIM) and field emission microscopy. The FSEE was observed at around the (111) plane of the annealed W tip surface. FIM observation of the annealed W tip revealed the existence of a pyramid-like protrusion at the W(111) surface. From these experimental results, a new emission model of the FSEE was proposed relating to the field-assisted surface structural change. This model deals with the buildup/collapse of the pyramid-like protrusion at the W(111) surface under the effect of negative high electric field. The temperature dependence of the FSEE reported previously [Shiota , J. Appl. Phys. 85, 6811 (1999)] was qualitatively explained by this emission model. (C) 2001 American Institute of Physics.

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  • The effect of an electrostatic force on imageing a surface topography by noncontact atomic force microscope

    T. Shiota, K. Nakayama

    Japanese Journal of Applied Physics Part2   40 ( 9A/B )   L986 - L988   2001

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    Noncontact atomic force microscope (NC-AFM) with and without scanning Kelvin probe force microscope (SKPM) has been studied to clarify the effect of an electrostatic force between a cantilever tip and a specimen on the NC-AFM imaging. The NC-AFM image contrast of a quenched Si (111) surface reflected the distribution of the surface potential, while that observed with a feedback of the SKPM signal showed good agreements with the previous results. The experimental results show that the electrostatic force affects the NC-AFM image formation, so that the electrostatic effect must be compensated to obtain an actual surface topography by NC-AFM.

    DOI： 10.1143/JJAP.40.L986

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  • Effect of low-energy ion bombardment upon field-stimulated exoelectron emission from tungsten surfaces

    T Shiota, S Kibi, R Yamamoto, M Tagawa, N Ohmae, M Umeno

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS   39 ( 2A )   L110 - L112   2000.2

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    The field-stimulated exoelectron emission (FSEE) from a tungsten surface bombarded by helium ions with incident energies ranging from 300 to 580 eV was investigated. When a tip was cooled down to 185 K, FSEE was clearly detected at the ion-bombarded tungsten surface with incident energies higher than 500 eV which corresponds to the sputtering threshold of tungsten atoms. A decay of FSEE intensity was also observed after the ion bombardment. In contrast, FSEE was not obvious at the tip temperature of 300 K. These experimental results would be explained by the emission model which is related to a rearrangement of surface tungsten atoms distorted by the ion bombardment.

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  • Alumina zirconia composite coating for improving wear resistance of connecting parts in artificial hip joint

    塩田忠, 愛原蒼平, 大宮祐也, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2022   2022

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  • Tribological properties in water of silica coatings on stainless steel substates

    塩見公, 塩田忠, 大宮祐也, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021

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  • Improvement of friction property in normal saline by silicon carbide coating

    塩田忠, 谷家大樹, 竹中優加, 石井良助, 大宮祐也, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2021   2021

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  • Effect of laser peened dimples on friction characteristics

    藤井正浩, 塩田忠, 大宮祐也, 河渕紗英子

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021

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  • A Discussion of Micro Leakage Mechanism Based on Microscopic Observation of Metal Flat Gasket Surface

    林大雅, 大宮祐也, 塩田忠, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2021   2021

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  • Application of Wood-Derived Nanocarbon Materials to Rubber and their Mechanical Properties

    PENG Lyuan, 大宮祐也, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021

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  • Fast time-resolved measurement during fracture of alumina ceramics

    塩田忠, IM Mingyun, 大宮祐也, 藤井正浩

    日本セラミックス協会年会講演予稿集(Web)   2021   2021

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  • Influence of Surface Roughness on Behavior of Angle Control Tightening

    玄馬之善, 大竹遼平, 両角由貴夫, 大宮祐也, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021

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  • Influence of tightening speed on thread damage in grease lubrication

    川口隼己, 大宮祐也, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

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  • Effect of tribocharging on the occurrence of low friction state by water-lubricated sliding of silicon carbide

    XIAO Jiaxin, 塩田忠, 大宮祐也, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

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  • Leakage characteristic of pipe flange connection including dispersed axial bolt force

    ZHU Wanyu, 大宮祐也, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

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  • Influence of surface texturing on adhesive joint strength

    豊田健二, 大宮祐也, 中西亮太, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

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  • Influence of laser peening on rolling contact fatigue life of carburized and hardened steel

    影山大恩, 河渕紗英子, 塩田忠, 大宮祐也, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

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  • 面接触摺動下における木材由来カーボン添加グリースのトライボロジー特性

    谷家大樹, 大宮祐也, 藤井正浩, 塩田忠

    日本設計工学会研究発表講演会講演論文集   2018   2018

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  • 101 Stochastic analysis of grain motion in TZP ceramics during superplastic deformation

    OKAMOTO Taku, YASUDA Kouichi, SHIOTA Tadashi

    Materials and processing conference   2010 ( 18 )   "101 - 1"-"101-3"   2010.11

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  • 110 Measuring of photon emission during crack growth

    SATO Yoshitaka, SHIOTA Tadashi, YASUDA Kouichi

    Materials and processing conference   2010 ( 18 )   "110 - 1"-"110-3"   2010.11

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  • 研究室公開における『力と遊ぼう』体験学習

    安田公一, 塩田忠

    セラミックス   45 ( 4 )   285 - 288   2010

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  • 422 Statistical analysis of grain trajectories based on Brownian motion during superplastic deformation of TZP

    OKAMOTO Taku, YASUDA Kouichi, SHIOTA Tadashi

    Materials and processing conference   2009 ( 17 )   "422 - 1"-"422-2"   2009.11

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  • 424 Statistical Model for Damage Estimation based on Non-linearity of Stress/Strain Curve

    YASUDA Kouichi, FURUSHIMA Ryoichi, SHIOTA Tadashi

    Materials and processing conference   2009 ( 17 )   "424 - 1"-"424-2"   2009.11

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    This paper proposes a new statistical model to evaluate damage evolution in porous ceramics. The model is based on parallel elements model and finally shows that the second order derivative of a stress/strain curve is proportional to a probability density function of strain at which each element is damaged. Uni-axial compression test was carried out for an insulating brick and its probability function is calculated from the non-linear stress/strain curve. The function agrees well with acoustic emission data simultaneously measured in the compression test. This fact shows that this model is useful for quick and brief estimation of damage evolution in porous ceramics.

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  • セラミックスの信頼性（最近10年間の研究動向）

    安田公一, 塩田 忠, 松尾陽太郎

    日本信頼性学会誌   30 ( 8 )   652 - 659   2008

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  • 508 Derivation of Marginal Distribution Functions for Fracture Stress and Fracture Location of Fibers in Unidirectional Fiber-reinforced Composites

    YASUDA Kouichi, MATSUO Yohtaro, SHIOTA Tadashi

    Materials and processing conference   2007 ( 15 )   327 - 328   2007.11

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    This paper deals with marginal distribution functions for fracture stress and fracture location of fibers in unidirectional fiber-reinforced composites. By integrating the combined probability density function, two marginal distribution functions are obtained. One is the marginal distribution for fracture stress, and the other is that for fracture location. The former function totally agrees to 2-parameters Weibull distribution function premised on this theory, and this verifies the combined probability density function itself. The latter function is not so easy to use in experimental data analysis, so that another way is proposed based on k-th moments.

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  • 506 Theoretical analysis on amplitude change and phase shift of elastic scattering waves by cylindrical inclusions

    FURUHIMA Ryoichi, MATSUO Yohtaro, SHIOTA Tadashi, YASUDA Kouichi

    Materials and processing conference   2007 ( 15 )   323 - 324   2007.11

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    Changes in amplitude and phase of incident waves due to scattering by cylindrical inclusions contained in an isotropic matrix are considered. These changes relate to changes in apparent sonic velocity and attenuation coefficient obtained by the ultrasonic method. The integral equation suggested by Lavrov for scattering waves due to single inclusion gives the changes in amplitude and phase. In order to consider the cases that the number of inclusions contained in the matrix is more than two, the frequency response function corresponding to the frequency response when the incident waves passed through the single inclusion in the matrix was introduced.

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  • 507 Influence of a grain size on the wavelength distribution of photons emitted during the fracture of polycrystalline MgO

    SHIOTA Tadashi, YASUDA Kouichi, MATSUO Yohtaro

    Materials and processing conference   2007 ( 15 )   325 - 326   2007.11

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    Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

    The photon emission during fracture was measured under the vacuum less than 1×10^<-4>Pa on single crystal MgO and polycrystalline MgO with three different sizes of grain, 33, 84 and 116μm. The emission intensity of the photons ranging from 300 to 850nm decreased with the grain size. The proportion of the UV photons (300 to 380nm) in the photon emission showed the maximum in the single crystal MgO, and decreased with the grain size in the polycrystalline. MgO. As the grain size became larger, the fraction of intergranular fracture was increased in the polycrystalline MgO sample. The result shows that the fracture mode influences not only the emission intensity, but also the wavelength distribution in the photon emission during fracture.

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  • Damage Evaluation of Alumina-Graphite Refractories Subjected to Thermal Shock and Mechanical Stress Using Ultra-Sonic Pulse-Echo Method

    MATSUO YOHTARO, OKAJIMA TAKUMA, FURUSHIMA RYOUICHI, YASUDA KOUICHI, SHIOTA TADASHI, IKEMOTO TADASHI, GOTO KIYOSHI, MATSUI TAIJIRO

    27 ( 2 )   133 - 133   2007.6

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  • Modeling of Damage Process for Alumina/Graphite Refractory under Uni-Axial Compressive Loading

    FURUSHIMA Ryoichi, MATSUO Yohtaro, SHIOTA Tadashi, YASUDA Kouichi

    59 ( 3 )   139 - 139   2007.3

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  • Damage Evaluation of Alumina-Graphite Refractory subjected to Thermal Shock and Mechanical Stress using Ultra-Sonic Pulse-Echo Method

    MATSUO Yohtaro, OKAJIMA Takuma, FURUSHIMA Ryouichi, YASUDA Kouichi, SHIOTA Tadashi, IKEMOTO Tadashi, GOTO Kiyoshi, MATSUI Taijiro

    59 ( 3 )   143 - 143   2007.3

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  • Theory of NDI for Brittle Materials and Its Application to Surface Strengthening

    MATSUO YOHTARO, SHIOTA TADASHI, YASUDA KOUICHI

    26 ( 3 )   246 - 246   2006.9

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  • Theory of NDI for Brittle Materials and its Application to Surface Strengthening

    MATSUO Yohtaro, SHIOTA Tadashi, YASUDA Kouichi

    58 ( 3 )   167 - 167   2006.3

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  • Densification Process of Powder Compaction by Cyclic CIP

    Kouichi Yasuda Tadashi Kitamura Yohtaro, Matsuo, Tadashi Shiota

    Proceedings of Materials Science and Technology 2006:PROCESSING   495 - 506   2006

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  • 炭素繊維/フラン樹脂系炭素複合材料の引張り破壊モードのwork-of-fractureの熱処理温度の影響

    乾浩敏, 安田公一, 塩田忠, 松尾陽太郎

    日本セラミックス協会第17回秋季シンポジウム講演予稿集   119   2004

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  • MgOの破壊に伴うフォトンエミッションに及ぼす粒径の影響

    塩田忠, 豊島康夫, 安田公一, 松尾陽太郎

    日本セラミックス協会第17回秋季シンポジウム講演予稿集   197   2004

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  • 粒子分散複合材料の負荷・除荷過程における音速変化

    古嶋亮一, 松尾陽太郎, 塩田忠, 安田公一

    日本セラミックス協会第17回秋季シンポジウム講演予稿集   206   2004

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  • ワイブル係数の応力比依存性に関する理論的考察

    松尾陽太郎, 塩田忠, 安田公一

    日本セラミックス協会第17回秋季シンポジウム講演予稿集   206   2004

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  • 多結晶MgOの破壊に伴うフラクトルミネッセンスの雰囲気依存性

    塩田忠, 豊島康夫, 安田公一, 松尾陽太郎

    日本セラミックス協会2004年年会講演予稿集   247   2004

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  • 繊維強化セラミックスのワーク・オブ・フラクチャーに関する理論解析

    安田公一, 松尾陽太郎, 塩田忠

    日本セラミックス協会2004年年会講演予稿集   248   2004

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  • 等方性黒鉛の強度のばらつきおよび破壊歪におよぼす応力比の影響

    松尾陽太郎, 山本浩司, 塩田忠, 安田公一

    日本セラミックス協会2004年年会講演予稿集   248   2004

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  • 超音波パルスエコー法による等方性黒鉛の機械的損傷評価

    古嶋亮一, 松尾陽太郎, 塩田忠, 安田公一

    日本セラミックス協会2004年年会講演予稿集   249   2004

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  • 炭素繊維/フラン樹脂系炭素複合材料のmodal work-of-fractureの熱処理温度依存性

    乾浩敏, 安田公一, 塩田忠, 松尾陽太郎

    第42回セラミックス基礎科学討論会講演要旨集   46   2004

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  • Analysis of total dissipation energy during debonding and pullout processes in fiber-reinforced composites

    Kouichi Yasuda Yohtaro, Matsuo, Tadashi Shiota

    Abstract Book of the 5th International meeting of Pacific Rim Ceramic societies   106   2003

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  • Evaluation of thermal shock induced and mechanically induced damages of heterogeneous brittle materials by means of ultrasonic pulse echo method

    Yohtaro Matsuo, Takuma, Yohtaro Matsuo; Takuma Okajima; Tadashi Shiota; Kouichi Yasuda, Tadashi Shiota

    Abstract of the 8th IUMRS international conference on advanced materials   240   2003

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  • Photon and electron emissions from the fracture of polycrystalline magnesium oxide in ultra high vacuum

    Tadashi Shiota, Kouichi, Yasuda Yohtaro Matsuo

    Abstract Book of the 5th International meeting of Pacific Rim Ceramic societies   85   2003

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  • Photon and electron emissions from the fracture of polycrystalline magnesium oxide in ultra high vacuum

    Tadashi Shiota, Kouichi, Yasuda Yohtaro Matsuo

    Abstract Book of the 5th International meeting of Pacific Rim Ceramic societies   85   2003

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  • Damage evaluation of brittle materials subjected to thermal and mechanical stresses using ultrasonic pulse-echo method

    03 ( 32 )   161 - 162   2003

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  • Analysis of total dissipation energy during debonding and pullout processes in fiber-reinforced composites

    Kouichi Yasuda Yohtaro, Matsuo, Tadashi Shiota

    Abstract Book of the 5th International meeting of Pacific Rim Ceramic societies   106   2003

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  • In situ observation of damage process of alumina-carbon refractories subjected to compressive stress using ultrasonic pulse-echo method

    Yohtaro Matsuo, Takuma, Yohtaro Matsuo; Takuma Okajima; Tadashi Shiota; Kouichi Yasuda, Tadashi Shiota

    Proceedings of the 22nd forum on basic science of high-temperature ceramics   15   2003

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  • Evaluation of dissipation energies during debonding and fiber-pullout proceese of a C/C composite

    Kouichi Yasuda Takanori, Tadashi Shiota, Shiota Yohtaro Matsuo

    Proceedings of the 20th International Japan-Korea Seminar on Ceramics   367 - 370   2003

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  • In situ observation of damage process of alumina-carbon refractories subjected to compressive stress using ultrasonic pulse-echo method

    Yohtaro Matsuo, Takuma, Yohtaro Matsuo; Takuma Okajima; Tadashi Shiota; Kouichi Yasuda, Tadashi Shiota

    Proceedings of the 22nd forum on basic science of high-temperature ceramics   15   2003

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  • 熱的・機械的損傷を受けたぜい性材料の超音波パルスエコー法による評価

    松尾陽太郎, 岡島琢磨, 塩田忠, 安田公一

    日本機会学会第１１回機械材料・材料加工技術講演会講演論文集   03 ( 32 )   161 - 162   2003

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  • Evaluation of thermal shock induced and mechanically induced damages of heterogeneous brittle materials by means of ultrasonic pulse echo method

    Yohtaro Matsuo, Takuma, Yohtaro Matsuo; Takuma Okajima; Tadashi Shiota; Kouichi Yasuda, Tadashi Shiota

    Abstract of the 8th IUMRS international conference on advanced materials   240   2003

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  • Evaluation of dissipation energies during debonding and fiber-pullout proceese of a C/C composite

    Kouichi Yasuda Takanori, Tadashi Shiota, Shiota Yohtaro Matsuo

    Proceedings of the 20th International Japan-Korea Seminar on Ceramics   367 - 370   2003

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  • Si表面におけるスクラッチ損傷面の酸化過程

    塩田忠

    トライボロジー会議2001・秋、講演予稿集   263 - 264   2001

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  • Si(111)7×7表面における電位分布像の原子スケール観察

    塩田忠

    第62回応用物理学会学術講演会講演予稿集   505   2001

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  • Si表面における接触・摩擦帯電現象

    塩田忠

    トライボロジー会議2001・春、講演予稿集   257 - 258   2001

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  • 異なる電位を有する表面の非接触AFM観察

    塩田忠

    第48回応用物理学関係連合講演会講演予稿集   684   2001

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  • タングステン表面における表面原子拡散に伴う電界刺激エキソ電子放射現象

    塩田忠

    第1回日本表面科学会関西支部学生セッション講演予稿集   27 - 28   2000

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  • Si/Si接触帯電面の走査型ケルビンプローブ顕微鏡観察

    塩田忠

    第20回表面科学講演大会講演予稿集   76   2000

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  • Si/Si接触帯電のナノスケール計測

    塩田忠

    機械技術研究所内研究発表概要集   5   2000

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  • 第一原理計算によるエキソ電子放射機構の解明

    塩田忠

    トライボロジー会議2000・春、講演予稿集   347 - 348   2000

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  • タングステン表面における電界刺激エキソ電子放射サイトの分布

    塩田忠

    第47回応用物理学関係連合講演会講演予稿集   2000

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  • Transient exoelectron emission from a clean tungsten tip at 200-450 K triggered by the surface electric field

    T. Shiota, M. Tagawa, M. Umeno, N. Ohmae

    Journal of Applied Physics   85 ( 9 )   6811 - 6815   1999.5

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    Language：English   Publisher：American Institute of Physics Inc.  

    The temperature dependence of field-stimulated exoelectron emission (FSEE) on a clean W tip was investigated. The increase of the electron emission at the moment of reapplication of the tip voltage was observed at the temperatures 200-450 K. This emission property was similar to the storage effect of exoelectron emission from Al tips reported previously. [Appl. Phys. Lett. 53, 626 (1988).] However, the emission intensity was independent of the voltage interruption period. The change in work function was also indicated at the temperature where FSEE was observed. The FSEE on W tips observed in this study was explained by the exoelectron emission during the surface reconstruction of W{001} and/or W{031} triggered by the high electric field. © 1999 American Institute of Physics.

    DOI： 10.1063/1.370198

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  • 第一原理計算を用いたAl酸素吸着表面からのエキソ電子放射機構の解明

    塩田忠

    第46回応用物理学関係連合講演会講演予稿集   719   1999

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  • First-principles calculational study of the exoelectron emission of oxygen-adsorbed aluminum surfaes

    T. Shiota, M. Morita M, Umeno, M. Tagawa, N. Ohmae, N. Shima

    Physical Review B   60 ( 23 )   16114 - 16119   1999

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  • Origin of the field-stimulated exoelectron emission from tungsten tip surfaces

    T Shiota, M Morita, M Tagawa, N Ohmae, M Umeno

    ULTRAMICROSCOPY   73 ( 1-4 )   217 - 221   1998.6

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    Language：English   Publisher：ELSEVIER SCIENCE BV  

    Emission characteristics of the field-stimulated exoelectron emission (FSEE) from tungsten surfaces and the effect of gas adsorption on the FSEE have been investigated. The clean tungsten tip surfaces were prepared using the field evaporation technique. The clean tungsten surfaces thus prepared did not liberate FSEE. Physical adsorption of the residual gas atoms at the tungsten surface resulted in FSEE, An obvious enhancement of the FSEE signal due to gas adsorption was observed in which no significant change of the field emission pattern was caused. Therefore, FSEE is thus revealed the high sensitivity to the surface conditions. (C) 1998 Elsevier Science B.V. All rights reserved.

    DOI： 10.1016/S0304-3991(97)00159-9

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  • エキソ電子放射メカニズム解明のための理論的アプローチ

    塩田忠

    大阪大学大型計算機センターNews   28 ( 3 )   7 - 11   1998

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  • 水素吸着タングステン表面におけるFSEEの温度依存性

    塩田忠

    第59回応用物理学会学術講演会講演予稿集   570   1998

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  • W表面からのエキソ電子放射－清浄表面でFSEEは生じるか－

    塩田忠

    トライボロジー会議1997・春、講演予稿集   1997

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  • タングステン表面における水素吸着がFSEEに及ぼす影響

    塩田忠

    第58回応用物理学会学術講演会講演予稿集   1997

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  • W清浄表面に形成されるエキソ電子放射サイト

    塩田忠

    第44回応用物理学関係連合講演会講演予稿集   1997

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  • 電界刺激エキソ電子放射の放射モデル

    塩田忠

    第57回応用物理学会学術講演会講演予稿集   1996

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Presentations

  • 水潤滑下におけるステンレス基材上の酸化物コーティング膜のトライボロジー特性

    塩見公,塩田忠,大宮祐也,藤井正浩

    日本設計工学会中国支部2020年度研究発表講演会 

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    Event date： 2020.6.6

    Language：Japanese  

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  • 表面テクスチャリングが接着継ぎ手強度に与える影響

    豊田健二,大宮祐也,中西亮太,塩田忠,藤井正浩

    日本機械学会中四国支部第58期総会・講演会 

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    Event date： 2020.3.6

    Language：Japanese  

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  • レーザピーニングが浸炭硬化鋼の転動疲労寿命に及ぼす影響 International conference

    影山大恩,河渕紗英子,塩田忠,大宮祐也,藤井正浩

    日本機械学会中四国支部第58期総会・講演会 

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    Event date： 2020.3.6

    Language：Japanese  

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  • ボルト軸力にばらつきを有する管フランジ締結体の漏えい特性

    朱万玉,大宮祐也,藤井正浩,塩田忠

    日本機械学会中四国支部第58期総会・講演会 

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    Event date： 2020.3.6

    Language：Japanese  

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  • 炭化ケイ素の水潤滑しゅう動における低摩擦状態の発現に及ぼす摩擦帯電の影響

    肖佳シン,塩田忠,大宮祐也,藤井正浩

    日本機械学会中四国支部第58期総会・講演会 

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    Event date： 2020.3.6

    Language：Japanese  

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  • ねじ締結速度がグリース潤滑されたねじ面の損傷に及ぼす影響

    川口隼己,大宮祐也,藤井正浩.塩田忠

    日本機械学会中四国支部第58期総会・講演会 

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    Event date： 2020.3.6

    Language：Japanese  

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  • Al2O3−ZrO2系セラミックスの高温トライボロジー特性

    岡本京介,塩田忠,大宮祐也,藤井正浩

    第26回ヤングセラミストミーティング in 中四国 

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    Event date： 2019.12.7

    Language：Japanese   Presentation type：Poster presentation  

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  • アルミナ基板上へのSiC薄膜合成とその機械特性評価

    谷家大樹,秋山美穂,竹中優加,塩田忠,大宮祐也,藤井正浩

    第26回ヤングセラミストミーティング in 中四国 

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    Event date： 2019.12.7

    Language：Japanese   Presentation type：Poster presentation  

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  • Resistive switching in Y2O3-doped ZrO2 epitaxial thin films International conference

    T. Shiota, K. Futatsumori, R. Shirata, O. Sakurai, K. Shinozaki

    TACT2019 International Thin Films Conference 

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    Event date： 2019.11.17 - 2019.11.20

    Language：English   Presentation type：Poster presentation  

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  • Mechanical Properties of Amorphous SiC thin films on Al2O3 Ceramic Substrates International conference

    T. Shiota, D. Taniya, M. Okiyama, Y. Takenaka, Y. Omiya, T. Ikoma, M. Fujii

    The 13th Pacific Rim Conference of Ceramic Societies 

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    Event date： 2019.10.27 - 2019.11.1

    Language：English   Presentation type：Poster presentation  

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  • Tribological behavior of silicon carbide coating films for ceramic-on-ceramic artificial joints International conference

    T. Shiota, M. Akiyama, D. Taniya, Y. Omiya, T. Ikoma, M. Fujii

    The 8th International Conference on Manufacturing, Machine Design and Tribology 

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    Event date： 2019.4.24 - 2019.4.27

    Language：English   Presentation type：Oral presentation (general)  

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  • Influence of tightening speed on rapture of screw threads International conference

    Y. Omiya, H. Kawaguchi, T. Shiota, M. Fujii

    The 8th International Conference on Manufacturing, Machine Design and Tribology 

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    Event date： 2019.4.24 - 2019.4.27

    Language：English   Presentation type：Oral presentation (general)  

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  • PVD法による炭化物薄膜の合成と機械的応用

    塩田忠

    日本材料学会中国支部材料研究交流会 

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    Event date： 2019.3.26

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

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  • 面接触摺動下における木材由来カーボン添加グリースのトライボロジー特性

    谷家大樹、大宮祐也、藤井正浩、塩田忠

    日本設計工学会2018年度秋季研究発表講演会 

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    Event date： 2018.9.28 - 2018.9.29

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • PVD法による機能性セラミック薄膜の合成と応用

    塩田 忠

    第69回中国四国機素潤滑設計技術研究会，第67回中国四国支部MD&T研究会 

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    Event date： 2018.7.6

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

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  • Al(CH3)3とO2を用いたMOCVD法によるAl2O3製膜に及ぼすH2添加の影響

    林俊甫、西山昭雄、塩田忠、安田公一、篠崎和夫

    日本セラミックス協会2018年年会 

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    Event date： 2018.3.15 - 2018.3.17

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • S042023 Photon Emission Characteristics during Crack Propagation in Glass Materials

    SHIOTA Tadashi, SATO Yoshitaka, YASUDA Kouichi

    Mechanical Engineering Congress, Japan  2011.9.11  The Japan Society of Mechanical Engineers

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    Event date： 2011.9.11

    Language：Japanese  

    2.7eV and 1.9eV photon emissions (PEs) were measured during crack propagation in brittle fracture of silica glass, borosilicate glass and soda-lime glass. In silica glass, an intense 2.7eV-PE was observed at the beginning of the crack propagation, and 1.9eV-PE was detected during the crack propagation. On the other hand, only an intermittent 2.7eV-PE was observed in both of borosilicate glass and soda-lime glass. The difference on the PE characteristics could be related to that on microscopic processes in the crack propagation. This result implies that the PE is a tool to study crack propagation in brittle materials on a microscopic scale.

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  • セラミックスの破壊に伴うフォトンエミッション

    塩田忠

    第48回ガラスおよびフォトニクス材料討論会講演要旨集  2007 

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    Event date： 2007

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  • シリカガラスの破壊の伴う粒子放出特性

    第48回セラミックス基礎科学討論会  2010 

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  • TZPセラミックスの超塑性変形における粒子流跡線の分解

    日本セラミックス協会2010年年会講演予稿集  2010 

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  • チョークの不思議な壊れ方

    日本セラミックス協会2010年年会講演予稿集  2010 

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  • ガドリニアドープセリアセラミックスの破壊源の同定

    日本セラミックス協会2010年年会講演予稿集  2010 

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  • Characteristics of particle emission during fracture of silica glass

    2010 

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  • Decomposition of grain trajectories in TZP ceramics under superplastic deformation

    Abstract Book of Annual Meeting of the Ceramic Society of Japan in 2010  2010 

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  • Wondering shape after breaking of chalk

    Abstract Book of Annual Meeting of the Ceramic Society of Japan in 2010  2010 

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  • Itentification of Fracture Origins in Gadolinia-doped Ceria Ceramics

    Abstract Book of Annual Meeting of the Ceramic Society of Japan in 2010  2010 

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  • 応力／ひずみ曲線の非線形性に基づいた多孔質セラミックスの損傷発展に関する新評価法

    日本機械学会2009年度年次大会講演論文集  2009 

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  • High-Temperature Compressive Deformation of Calcium Phosphate Bioceramics

    3rd International Symposium on Atomic Technology and 3rd Polyscale Technology Workshop  2009 

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  • Estimation of the Number of Cracks Generated by Compressive Stress in Polycrystalline Graphite

    3rd International Symposium on Atomic Technology and 3rd Polyscale Technology Workshop  2009 

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  • Estimation of Weibull Parameters based on the parameters of the Initial Distribution of Flaw Size

    The international exchange center, Tokyo, Japan  2009 

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  • Evaluation of Damage Evolution of Porous Ceramics based on Nonlinearity in Stress/Strain curve

    Abstract Book of Annual Meeting of the Ceramic Society of Japan in 2009  2009 

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  • Hands-on Learning "Play with Force" for Open Laboratory

    Abstract Book of Annual Meeting of the Ceramic Society of Japan in 2009  2009 

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  • 研究室公開における『力と遊ぼう』体験学習

    日本セラミックス協会2009年年会講演予稿集  2009 

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  • 界面層を有する任意形状介在物問題の弾性解析

    日本セラミックス協会2009年年会講演予稿集  2009 

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  • Random Walk Analysis of Grain motion during Superplastic Deformation of TZP

    The 3rd International Symposium on Atomic Technology and the 3rd Polyscale Technology Workshop  2009 

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  • 炭素材料の破壊におけるフォトンエミッション計測

    日本セラミックス協会2009年年会講演予稿集  2009 

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  • セラミックスの表面形成に伴うミクロ電磁気現象の解明

    2009 

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  • 脆性材料の破壊に伴うルミネッセンス

    2009 

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  • ガドリニアドープセリアセラミックスの破壊源の同定

    日本セラミックス協会2009年年会講演予稿集  2009 

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  • Simultaneous measurement of the emission of photons and charged particles during brittle fracture

    3rd international conference on science and technology for advanced ceramics  2009 

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  • Theoretical Prediction of Work-of-fracture of Carbon/Carbon Composites

    International Conference on Composites or Nano Engineering  2009 

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  • Gas Dischrage Luminescence During Fracture of Ceramic Materials

    Tribochemistry Kyoto 2009  2009 

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  • Random walk analysis of grain motion during superplastic deformation of TZP

    The Third International Symposium on Atomic Technology  2009 

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  • Detection of damage initiation and its evolution in insulating brick from non-linearity of stress/strain curve

    The Third International Symposium on Atomic Technology  2009 

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  • Analysis of Fracture Origin in Gadolinia-Doped Ceria Ceramics

    2009 

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  • Estimation of Damage Evolution of Porous Ceramics by Nonlinearity in Stress-Strain Curve

    The 47th Symposium on Basic Science of Ceramics Abstract Book  2009 

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  • Fractography of Gadolinia-doped Ceria Ceramics

    3rd International Symposium on Atomic Technology and 3rd Polyscale Technology Workshop  2009 

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  • Damage Accumulation of Insulating Brick during Loading/Unloading Cycle estimated from Nonlinearity of Stress/Strain Curve in Compression

    The 3rd International Symposium on Atomic Technology and the 3rd Polyscale Technology Workshop  2009 

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  • High-Temperature Compressive Deformation of Calcium Phosphate Bioceramics

    3rd International Symposium on Atomic Technology and 3rd Polyscale Technology Workshop  2009 

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  • Estimation of the Number of Cracks Generated by Compressive Stress in Polycrystalline Graphite

    3rd International Symposium on Atomic Technology and 3rd Polyscale Technology Workshop  2009 

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  • Estimation of Weibull Parameters based on the parameters of the Initial Distribution of Flaw Size

    The international exchange center, Tokyo, Japan  2009 

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  • 応力／ひずみ曲線の非線形性に基づく多孔質セラミックスの損傷発展の評価

    日本セラミックス協会2009年年会講演予稿集  2009 

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  • Detection of damage initiation and its evolution in insulating brick from non-linearity of stress/strain curve

    The Third International Symposium on Atomic Technology  2009 

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  • ガドリニアドープセリアセラミックスの破面解析

    2009 

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  • 欠陥寸法原分布に基づくワイブルパラメータ新評価法

    日本機械学会2009年度年次大会講演論文集  2009 

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  • 応力／ひずみ曲線の非線形性から見た材料の損傷発展

    日本セラミックス協会第22回秋季シンポジウム講演予稿集  2009 

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  • ガドリニアドープセリアセラミックスの破壊原因の解析

    日本セラミックス協会第22回秋季シンポジウム講演予稿集  2009 

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  • 応力／ひずみ線図の非線形性に基づく損傷評価のための確率モデル

    日本機械学会第17回機械材料・材料加工技術講演会  2009 

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  • ＴＺＰの超塑性変形における粒子流跡線のブラウン運動に基づく解析

    日本機械学会第17回機械材料・材料加工技術講演会  2009 

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  • Estimation of the number of cracks generated by compressive stress in polycrystalline graphite using ultrasonic method

    The Third International Symposium on Atomic Technology  2009 

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  • Estimation of Weibull parameters from parameters of initial distribution of flaw size

    The Third International Symposium on Atomic Technology  2009 

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  • Random walk analysis of grain motion during superplastic deformation of TZP

    The Third International Symposium on Atomic Technology  2009 

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  • Damage Accumulation of Insulating Brick during Loading/Unloading Cycle estimated from Nonlinearity of Stress/Strain Curve in Compression

    The 3rd International Symposium on Atomic Technology and the 3rd Polyscale Technology Workshop  2009 

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  • Theoretical Prediction of Work-of-fracture of Carbon/Carbon Composites

    International Conference on Composites or Nano Engineering  2009 

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  • Estimation of Weibull parameters from parameters of initial distribution of flaw size

    The Third International Symposium on Atomic Technology  2009 

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  • Gas Dischrage Luminescence During Fracture of Ceramic Materials

    Tribochemistry Kyoto 2009  2009 

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  • New Evaluation Method for Damage Evolution in Porous Ceramics Based on Nonlinearity in Stress/Strain Curve

    Mechanical Engineering Congess, 2009 Japan  2009 

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  • New Evaluation Method of Weibull Prameters Based on Initial Distribution of Flaw SIze

    Mechanical Engineering Congess, 2009 Japan  2009 

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  • Damage Evolution of Materials from the Aspect of Nonlinearity in Stress/Strain Curve

    The 22nd Fall Meeting of the Ceramic Society of Japan  2009 

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  • Identification of Fracture Origins in Gadolinia-doped Ceria Ceramics

    The 22nd Fall Meeting of the Ceramic Society of Japan  2009 

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  • Statistical Model for Damage Estimation based on Non-linearity of Stress/Strain Curve

    2009 

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  • Statistical analysis of grain trajectories based on Brownian motion during superplastic deformation of TZP

    2009 

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  • Estimation of the number of cracks generated by compressive stress in polycrystalline graphite using ultrasonic method

    The Third International Symposium on Atomic Technology  2009 

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  • Random Walk Analysis of Grain motion during Superplastic Deformation of TZP

    The 3rd International Symposium on Atomic Technology and the 3rd Polyscale Technology Workshop  2009 

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  • Simultaneous measurement of the emission of photons and charged particles during brittle fracture

    3rd international conference on science and technology for advanced ceramics  2009 

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  • Estimation of Damage Evolution of Porous Ceramics by Nonlinearity in Stress-Strain Curve

    The 47th Symposium on Basic Science of Ceramics Abstract Book  2009 

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  • Fractography of Gadolinia-doped Ceria Ceramics

    3rd International Symposium on Atomic Technology and 3rd Polyscale Technology Workshop  2009 

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  • Tilt Angle Dependence of Interfacial Fracture Toughness of <0001> Tilt Boundary of Alumina

    The 2nd International Conference on Science and Technology for Advanced Ceramics (STAC2  2008 

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  • Theoretical analysis on changes in amplitude and phase of elastic incident waves by cylindrical inclusions

    2008 

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  • Bending strength dependence of the photon emission intensity during the fracture of silica glass

    2008 

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  • Nanoscopic distribution of potential and topography on Si (111) surfaces having 1x1 and 7x7 structures with and without scratching

    2008 

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  • Dependence of the particle emission during the fracture of silica glass on its mechanical property

    2008 

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  • Derivation of Distribution Function of Fiber-pullout Length in Unidirectional Fiber-reinforced Composites

    Abustract of Annual Meeting of the Ceramics Society of Japan, 2008  2008 

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  • Theoretical study for the distribution of flaw size at fracture origin of Alumina ceramics under a uniaxial tension

    Abstract of 2008 annual conference of The Ceramics Society of Japan  2008 

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  • Influence of mechanical properties on the fractoluminescence intensity in ceramics and glasses

    2008 

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  • Linearization of Flaw-Size Distribution of Ceramics

    STAC2&STSI  2008 

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  • Correlation between the flexure strength and photo nemission intensity during the fracture of single crystal and polycrystalline MgO

    2008 

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  • Nanoscopic distribution of potential and topography on Si (111) surfaces having 1x1 and 7x7 structures with and without scratching

    2008 

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  • Dependence of the particle emission during the fracture of silica glass on its mechanical property

    2008 

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  • 1方向繊維強化複合材料における繊維の引き抜き長さ分布の導出

    日本セラミックス協会2008年年会  2008 

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  • 一軸引張り応力下におけるアルミナの破壊源欠陥寸法分布に関する理論的考察

    日本セラミックス協会年会2008  2008 

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  • セラミックスおよびガラスにおけるフラクトルミネッセンスの発光強度に及ぼす機械的性質の影響

    トライボロジー会議予稿集東京2008-5  2008 

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  • Linearization of Flaw-Size Distribution of Ceramics

    STAC2&STSI  2008 

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  • Bending strength dependence of fractoluminescence intensity in silica glass, single crystal and polycrystalline MgO

    Tribology Online  2008 

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  • Correlation between the flexure strength and photo nemission intensity during the fracture of single crystal and polycrystalline MgO

    2008 

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  • 円筒介在物による弾性散乱波の位相・振幅に関する理論解析

    日本セラミックス協会2008年年会講演予稿集  2008 

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  • シリカガラスの破壊に伴うフォトンエミッション強度の曲げ強度依存性

    日本セラミックス協会2008年年会講演予稿集  2008 

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  • Estimation of displacement vector of grains in TZP ceramics during superplastic deformation

    Joint conference of STAC2 and STSI1  2008 

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  • Tilt Angle Dependence of Interfacial Fracture Toughness of <0001> Tilt Boundary of Alumina

    The 2nd International Conference on Science and Technology for Advanced Ceramics (STAC2  2008 

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  • Stress analysis for an arbitrary-shaped inclusion with interlayer under out-of-plane shear loading

    The 2nd international conference on science and technology for advanced ceramics  2008 

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  • Influence of the flaw-size distribution's parameter

    MSECJ-08  2008 

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  • Stress analysis around an arbitrary-shaped inclusion with interlayer

    2008 

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  • Theory on the exact value distribution of fracture strength taking the flaw size distribution as an initial distribution

    21st Fall Meeting of The Ceramic Society of Japan  2008 

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  • Detection of damage evolution of refractory by nonlinearity in stress-strain curve

    21st Fall Meeting of The Ceramic Sociaty of Japan  2008 

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  • Estimation of the number of inner cracks in polycrystalline graphite using ultrasonic pulse echo method

    Joint conference of STAC2 and STSI1  2008 

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  • Influence of beta-tricalcium phosphate content on mechanical properties of hydroxyapatite

    Joint conference of STAC2 and SITI1  2008 

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  • The emission of negative charges during fracture of polycrystalline ceramics

    Joint conference of STAC2 and STSI1  2008 

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  • Detection of damage evolution of refractory by nonlinearity in stress-strain curve

    21st Fall Meeting of The Ceramic Sociaty of Japan  2008 

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  • TZPの超塑性変形における結晶粒子の流跡線解析

    日本セラミックス協会第２１回秋季シンポジウム講演予稿集  2008 

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  • Bending strength dependence of fractoluminescence intensity in silica glass, single crystal and polycrystalline MgO

    Tribology Online  2008 

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  • 界面層を有する任意形状介在物問題の面外せん断荷重化の応力解析

    2008 

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  • セラミックスの欠陥寸法原分布のパラメータの破壊強度に及ぼす影響

    2008年度年次大会  2008 

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  • 界面層を有する任意形状介在物周りの弾性応力解析

    日本機械学会2008年度年次大会  2008 

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  • 水酸アパタイト／β－リン酸三カルシウム複合焼結体の機械的性質

    日本セラミックス協会第21回秋季シンポジウム講演予稿集  2008 

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  • 欠陥寸法原分布に基づく厳密極値分布としての破壊強度分布に関する理論解析

    日本セラミックス協会秋季シンポジウム  2008 

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  • Estimation of the number of inner cracks in polycrystalline graphite using ultrasonic pulse echo method

    Joint conference of STAC2 and STSI1  2008 

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  • Influence of beta-tricalcium phosphate content on mechanical properties of hydroxyapatite

    Joint conference of STAC2 and SITI1  2008 

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  • The emission of negative charges during fracture of polycrystalline ceramics

    Joint conference of STAC2 and STSI1  2008 

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  • Estimation of displacement vector of grains in TZP ceramics during superplastic deformation

    Joint conference of STAC2 and STSI1  2008 

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  • Correlation between the flexure strength and photon emission intensity during the fracture of single crystal and polycrystalline MgO

    Joint Confernece of 1st STAC and 2nd JTMC  2007 

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  • Evaluation of Damage for Alumina/Graphite Refractory using Apparent Sonic Velocity Measurement

    Key Engineering Materials  2007 

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  • The Role of Strength, Fracture Cause, and Fracture Location Data on the Reliabiliy Analysis of Ceramics

    Key Engineering Materials  2007 

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  • Influence of grain boundaries on a correlation between the flexure strength and the photon emission during the fracture of MgO

    2007 

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  • Analytical Method of Flaw-Size Data based on the Competing-Risks Model

    20th Fall Meeting of The Ceramic Society of Japan  2007 

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  • Correlation between the flexure strength and photon emission intensity during the fracture of single crystal and polycrystalline MgO

    Joint Confernece of 1st STAC and 2nd JTMC  2007 

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  • Theoretical estimation of work-of-fracture of unidirectional fiber-reinforced composites

    Joint Confernece of 1st STAC and 2nd JTMC  2007 

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  • Optical Microscopy of Multiple Matrix Cracking in a Carbon Fiber-Reinforced Glass Matrix Composite

    Fractography of Glasses and Ceramics  2007 

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  • The Role of Strength, Fracture Cause, and Fracture Location Data on the Reliabiliy Analysis of Ceramics

    Key Engineering Materials  2007 

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  • ＭｇＯの破壊に伴うフォトンエミッションと曲げ強度の相関関係に及ぼす粒界の影響

    日本セラミックス協会 第20回秋季シンポジウム  2007 

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  • 競合リスクモデルにおける欠陥寸法データの解析法

    日本セラミックス協会第20回秋季シンポジウム講演予稿集  2007 

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  • 荷重負荷時に発生した損傷歪分布に基づいた除荷曲線の推定理論

    第20回秋季シンポジウム  2007 

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  • Change in the coordination number distribution during powder compaction by Cyclic CIP

    Materials Science and Technology 2007  2007 

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  • 多結晶MgOの破壊に伴い放出されるフォトンの波長分布に与える粒径の影響

    第15回機械材料・材料加工技術講演会  2007 

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  • 1方向繊維強化複合材料中の繊維の破壊応力と破壊位置に関する周辺分布関数の導出

    第15回機械材料・材料加工技術講演会  2007 

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  • Theoretical estimation of work-of-fracture of unidirectional fiber-reinforced composites

    Joint Confernece of 1st STAC and 2nd JTMC  2007 

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  • Optical Microscopy of Multiple Matrix Cracking in a Carbon Fiber-Reinforced Glass Matrix Composite

    Fractography of Glasses and Ceramics  2007 

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  • Evaluation of Damage for Alumina/Graphite Refractory using Apparent Sonic Velocity Measurement

    Key Engineering Materials  2007 

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  • Estimation theory for unloading curve based on damage strain distribution on loading

    2007 

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  • Change in the coordination number distribution during powder compaction by Cyclic CIP

    Materials Science and Technology 2007  2007 

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  • Influence of a grain size on the wavelength distribution of photons emitted during the fracture of polycrystalline MgO

    2007 

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  • 構造用セラミックスの破壊に伴うエレクトロンエミッションとフォトンエミッションの同時計測

    日本セラミックス協会 2007年年会  2007 

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  • 多結晶黒鉛の損傷発生歪密度関数の決定法に関する考察

    日本セラミックス協会 2007年年会  2007 

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  • 熱衝撃および機械的応力を受けたアルミナー黒鉛質耐火物の超音波パルスエコー法による損傷評価

    第２０回耐火物技術協会年次講演会  2007 

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  • Simultaneous measurement of stiffness and conductacnce in a platinum atomic chain

    2006 

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  • セラミックスの強度信頼性解析における各種情報の役割

    日本セラミックス協会 2006年年会  2006 

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  • 耐火物の負荷・除荷過程における損傷の評価

    日本セラミックス協会 2006年年会  2006 

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  • 極値統計に基づく最大欠陥寸法分布の導出と強度分布との関係

    日本セラミックス協会 第19回秋季シンポジウム  2006 

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  • 応力/ひずみ曲線の非線形性から推定されたマイクロクラック発生応力分布に関する理論

    日本セラミックス協会 第19回秋季シンポジウム  2006 

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  • 応力ー歪曲線による多結晶黒鉛の損傷評価

    日本セラミックス協会 第19回秋季シンポジウム  2006 

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  • Derivation of probability distribution of maximim flaw size based on extreme value statistics and the relation to strength distribution

    Proceeding of 19th Fall Meeting of The Ceramics Society of Japan  2006 

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  • Densification Process of Powder Compaction by Cyclic CIP

    Material Science and Technology (MS&S) 2006  2006 

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  • 多結晶ジルコニアの超塑性変形における結晶粒子の運動学

    日本セラミックス協会 2006年年会  2006 

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  • 極値統計に基づく最大欠陥寸法分布の導出と強度分布との関係

    第19回秋季シンポジウム講演予稿集  2006 

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  • Densification Process of Powder Compaction by Cyclic CIP

    Material Science and Technology (MS&S) 2006  2006 

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  • The role of strength, fracture,cause and fracture location data on the realiability analysis of ceramics

    The 3rd International Symposium on Advanced Ceramics  2006 

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  • Evaluation of damage for alumina/graphite refractory using apparent sonic velocity measurement

    The 3rd International Symposium on Advanced Ceramics  2006 

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  • The role of strength, fracture,cause and fracture location data on the realiability analysis of ceramics

    The 3rd International Symposium on Advanced Ceramics  2006 

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  • Simultaneous measurement of stiffness and conductacnce in a platinum atomic chain

    2006 

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  • Evaluation of damage for alumina/graphite refractory using apparent sonic velocity measurement

    The 3rd International Symposium on Advanced Ceramics  2006 

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  • 多結晶ジルコニアの超塑性変形における結晶粒子の運動学

    日本セラミックス協会２００６年年会  2006 

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  • 長繊維強化セラミックス複合材料の破壊に伴う全散逸エネルギーに関する理論

    日本機械学会 2005年度年次大会  2005 

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  • Search for stable metallic nanowires by conductance and force measurements

    FOM meeting December 2005  2005 

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  • 長繊維強化複合材料の破壊エネルギーに関する評価理論の実験的検証

    日本セラミックス協会 2005年年会  2005 

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  • アルミナ/黒鉛質耐火物の負荷・除荷過程における損傷形成

    日本セラミックス協会 2005年年会  2005 

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  • 高温変形に伴う多結晶ジルコニア結晶粒子の変位ベクトル分布の変化

    日本セラミックス協会 第18回秋季シンポジウム  2005 

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  • 炭素繊維強化ガラスにおける多重マトリックスき裂の生成過程

    日本セラミックス協会 第18回秋季シンポジウム  2005 

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  • Ｃ/Ｃコンポジットの破壊エネルギーに関する理論の実験的検証

    日本セラミックス協会 第18回秋季シンポジウム  2005 

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  • 繰り返し負荷・除荷試験におけるアルミナ/黒鉛質耐火物の音速および減衰率の変化

    日本セラミックス協会 第18回秋季シンポジウム  2005 

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  • 表面および内部を強化したセラミックスの強度信頼性設計理論

    日本セラミックス協会 第18回秋季シンポジウム  2005 

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  • 表面を強化したセラミックスの強度信頼性設計理論

    日本セラミックス協会 2005年年会  2005 

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  • Search for stable metallic nanowires by conductance and force measurements

    FOM meeting December 2005  2005 

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  • 高温変形に伴う多結晶ジルコニア結晶粒子の変位ベクトル分布の変化

    日本セラミックス協会第１８回秋季シンポジウム  2005 

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  • 多結晶ジルコニアの高温変形における結晶粒子の運動学

    第４３回セラミックス基礎科学討論会  2005 

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  • 炭素繊維強化ガラスにおける多重マトリックスき裂の空間分布

    第４３回セラミックス基礎科学討論会  2005 

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  • 多結晶ジルコニアの高温変形における結晶粒子の運動学

    第４３回セラミックス基礎科学討論会  2005 

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  • 多結晶アナターゼ薄膜の光誘起親水性に関するドメインサイズの影響

    2004年 日本セラミックス協会 秋季シンポジウム  2004 

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  • Effect of Grain Size on the Photo-induced Hydrophilicity of the Polycrystalline TiO2 Thin Films by Sol-Gel Process

    The Ninth International Conference on TiO2 Photocatalysis: Fundamentals & Applications  2004 

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  • Effect of Grain Size on the Photo-induced Hydrophilicity of the Polycrystalline TiO2 Thin Films by Sol-Gel Process

    The Ninth International Conference on TiO2 Photocatalysis: Fundamentals & Applications  2004 

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  • Si(111)からの非定常イオン放出現象

    第22回表面科学講演大会講演要旨集  2002 

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  • 走査型ケルビンプローブ顕微鏡によるSi(111)の高分解能表面電位分布観察

    第22回表面科学講演大会講演要旨集  2002 

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  • NC-AFMにおける静電気力の影響

    2001 

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  • Application of the first-principles calculation in the exoemission of electrons from aluminum tips

    2000 

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  • Exoemission of electrons from tungsten surfaces under the effect of high electric field

    Latvian Journal of Physics and Technical Sciences  2000 

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  • Field-stimulated exoemission of electrons induced by the distortion of atomic arrangement at tungsten surfaces

    2000 

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  • Application of the first-principles calculation in the exoemission of electrons from aluminum tips

    2000 

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  • Exoemission of electrons from tungsten surfaces under the effect of high electric field

    Latvian Journal of Physics and Technical Sciences  2000 

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  • Field-stimulated exoemission of electrons induced by the distortion of atomic arrangement at tungsten surfaces

    2000 

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  • 表面原子拡散に伴う電界刺激エキソ電子放射

    第46回応用物理学関係連合講演会講演予稿集  1999 

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  • Origin of the field stimulated exoelectron emission from tungsten tip surfaes

    Ultramicroscopy  1998 

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  • Origin of the field stimulated exoelectron emission from tungsten tip surfaes

    Ultramicroscopy  1998 

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  • Emission behavior of field stimulated exoelectrons from tungsten surfaces under various hydrogen exposures

    Proceedings of the 12th international symposium on exoemission and its applications  1997 

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  • Field stimulated exoelectron emission -A survey of recent result-

    Proceedings of the 2nd symposium on Tribochemistry  1997 

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  • Emission characteristics of the field stimulated exoelectrons from tungsten tips -Does clean surface liberate exoelectrons-

    Proceedings of the 12th international symposium on exoemission and its applications  1997 

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  • Emission behavior of field stimulated exoelectrons from tungsten surfaces under various hydrogen exposures

    Proceedings of the 12th international symposium on exoemission and its applications  1997 

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  • Field stimulated exoelectron emission -A survey of recent result-

    Proceedings of the 2nd symposium on Tribochemistry  1997 

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  • Emission characteristics of the field stimulated exoelectrons from tungsten tips -Does clean surface liberate exoelectrons-

    Proceedings of the 12th international symposium on exoemission and its applications  1997 

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Research Projects

  • Development of smart radiation device by metal-insulator phase transition for artificial satellites

    Grant number：26630308  2014.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Shinozaki Kazuo, SAKURAI Osamu, SHIOTA Tadashi, WAKIYA Naoki, TACHIKAWA Sumitaka

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    Grant amount：\3900000 （ Direct expense: \3000000 、 Indirect expense：\900000 ）

    (Lal-xSrx)Mn03(LSMO) thin films were deposited on Si substrate by the sputtering and the chemical solution deposition (CSD) methods for controlling the thermal emissivity with changing the ambient temperature using the metal-insulator phase transition of LSMO. This is useful for control the internal temperature of the artificial satellite. In the RF magnetron-sputtering method, it is clear that RF power is the most important process factor to determine the composition of the LSMO film. Since the composition varied both La/Sr ratio and (La+Sr)/Mn ratio in the sputtering compared with PLD, we introduce the special factor named the apparent Mn valence number = 2(3-δ)-a(3-x) in (La1-xSrx)aMnO3, The apparent Mn valence number is useful to explain consistently the tendency of phase transition temperature. In the CSD method, we determined the optimum fabrication conditions and clarified the effect of composition and annealing in various Po2 on the phase transition temperatures.

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  • Development of homogeneous solid electrolyte/electrode structureby chemical vapor deposition method

    Grant number：23656426  2011 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    SHINOZAKI Kazuo, SAKURAI Osamu, SHIOTA Tadashi, WAKIYA Naoki, KIGUCHI Takanori

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    Grant amount：\3900000 （ Direct expense: \3000000 、 Indirect expense：\900000 ）

    Typical fabrication process of making solid electrolyte for the fuel cell is sintering. However it brings the inhomogeneity of cations from the in sufficient mixing of the raw materials and local diffusion during the sintering and also during long time running of power generation. These inhomogeneity is enhanced the large amount of trivalent cation doping, such as 20-30 at%. We proposed the chemical vapor deposition (CVD) using Ce(EtCp)_4 (Ce (C_5H_4C_2H_5)_4) and Gd(EtCp)_3 (Gd(C_5H_4C_2H_5)_3) as the source materials. In this research, we determined the optimum condition of these raw materials for CVD process for low-pressure coldwall-type-CVD apparatus. We succeeded to fabricate the columnar type GDC film on Al_2O_3, SiO_2/Si substrates. It was found that the film was grown at around 300℃ and has columnar structure that means no grain boundary in the out of plane direction. Since thinner thickness of the film and almost no grain boundary along the out of plane direction, oxide ion can be able to diffuse even at 180℃ by AC measurement. New type atmospheric pressure CVD apparatus was developed to grow the film with very fast growth rate. We also tried to fabricated the porous electrodes with dense surface layer for the anode: Ni-GDC and the cathode: LaSrCoO_3-GDC. GDC thin films by low pressure CVD were fabricated on the porous electrodes, and tried to generate the electric power in the H_2-O_2 system. Since the power generation test system is preliminary, but we have several important point to realize the CVD derived electrolyte system.

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  • Kinematical Theory for Grain Motion during Superplastic Deformation

    Grant number：20560067  2008 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    YASUDA Kouichi, SHIOTA Tadashi, OKAMOTO Taku

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    Grant amount：\4550000 （ Direct expense: \3500000 、 Indirect expense：\1050000 ）

    The displacement vectors of 748 grains of tetragonal zirconia ceramics were measured by electron microscopic observation of grain structure before and after superplastic deformation. Trajectory analysis showed that grains moved in zigzag way. So, the displacement vector was divided into the random walk vector and the drift vector calculated by finite element analysis Variances of random walk vectors for tensile direction and lateral direction had an inverse correlation at the beginning of superplastic deformation, however, these two variances became the almost same value with the deformation. The tendency was analyzed with Langevin equation.

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  • Phonon analysis and crystal chemical simulation of dielectrics based on sub-millimeter wave ellipsometry

    Grant number：19206068  2007 - 2009

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    TSURUMI Takaaki, TAKEDA Hiroaki, HOSHINA Takuya

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    Grant amount：\47450000 （ Direct expense: \36500000 、 Indirect expense：\10950000 ）

    Sub-millimeter wave spectroscopic ellipsometry has been developed to study the size effect of barium titanate and the phase transition behaviors of barium titanate-based relaxors. Ellipsometer is equipment which measures the change of polarizing state of reflected light to determine the complex dielectric permittivity of materials. Accuracy of the ellipsometer developed in this study was verified and the complex permittivity of a barium titanate single crystal was directly determined using it. S for the size effect, the permittivity of barium titanate ceramics increased with decreasing grain size when the grain size was over 1.1μm, while that decreased when the grain size was below 1μm. Most of the domains in BaTiO_3 grains had simple lamellar structures, and 90° domain width decreased with decreasing grain size. Based on wide band dielectric spectroscopy, the domain contribution to the permittivity was investigated. In BaTiO_3 ceramics with grain sizes over 1μm, the dipole and ionic polarizabilities were enhanced by the high domain density. In contrast, for the BaTiO_3 ceramics with grain sizes below 1μm, these polarizabilities were weakened. As for the phase transition of barium titanate-based relaxors, wideband dielectric spectra from kHz to THz were measured for ceramics of BaTiO_3 (BT), Ba_<0.6>Sr_<0.4>TiO_3 (BST-0.6) and BaZr_<0.25>Ti_<0.75>O_3 (BZT-0.25). The behavior in the dipole polarization near the dielectric maximum temperature (T_m) in BST-0.6 and BZT-0.25 could be explained by the behavior in polar nanoregions (PNRs), while the ferroelectric domains contribute to dipole polarization in BT. Relaxation in BT could be interpreted as successive change in polarization behavior from normal ferroelectrics to relaxor ferroelectric via DPT ferroelectrics.

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Class subject in charge

  • Tribological Machine Design （2023academic year） Prophase  - 火3～4,木1～2

  • Advanced Tribological Machine Design （2023academic year） Prophase  - 火3～4,木1～2

  • Basic Mechanical System Drawing （2023academic year） 1st and 2nd semester  - 木5～8

  • Basic Mechanical System Drawing （2023academic year） 1st and 2nd semester  - 木5～8

  • Basic Mechanical System Drawing （2023academic year） 1st and 2nd semester  - 木5～8

  • Applied Surface Engineering （2023academic year） Late  - その他

  • Advanced Surface Engineering （2023academic year） Late  - その他

  • Fundamentals of Vibration （2023academic year） 1st semester  - 月7～8,金1～2

  • Fundamentals of Vibration （2023academic year） 1st semester  - 月7～8,金1～2

  • Research Works for Mechanical and Systems Engineering 1 （2023academic year） Prophase  - その他

  • Research Works for Mechanical and Systems Engineering 2 （2023academic year） Late  - その他

  • Seminar on Mechanical Engineering 1 （2023academic year） Prophase  - その他

  • Seminar on Mechanical Engineering 2 （2023academic year） Late  - その他

  • Seminar in Machine Design and Tribology （2023academic year） Year-round  - その他

  • Seminar in Machine Design and Tribology （2023academic year） Year-round  - その他

  • Basic Physics （Classical Mechanics） 1 （2023academic year） Third semester  - 火5～6

  • Basic Physics （Classical Mechanics） 2 （2023academic year） Fourth semester  - 火5～6

  • Basic Physics （Classical Mechanics） （2023academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics 1（Classical Mechanics） （2023academic year） 3rd and 4th semester  - 火5～6

  • Advanced Study （2023academic year） Other  - その他

  • CAD （2023academic year） 1st and 2nd semester  - 水1～2

  • CAD （2023academic year） 1st and 2nd semester  - 金5～6

  • CAD （2023academic year） 1st and 2nd semester  - 水1～2

  • CAD （2023academic year） 1st and 2nd semester  - 水1～2

  • CAD （2023academic year） 1st and 2nd semester  - 金5～6

  • CAD （2023academic year） 1st and 2nd semester  - 金5～6

  • Basic Mechanical System Drawing （2022academic year） 1st and 2nd semester  - 木5～8

  • Basic Mechanical System Drawing （2022academic year） 1st and 2nd semester  - 木5～8

  • Basic Mechanical System Drawing （2022academic year） 1st and 2nd semester  - 木5～8

  • Applied Surface Engineering （2022academic year） Late  - その他

  • Fundamentals of Vibration （2022academic year） 1st semester  - 月3～4,木1～2

  • Research Works for Mechanical and Systems Engineering 1 （2022academic year） Prophase  - その他

  • Research Works for Mechanical and Systems Engineering 2 （2022academic year） Late  - その他

  • Seminar in Machine Design and Tribology （2022academic year） Year-round  - その他

  • Basic Physics （Classical Mechanics） 1 （2022academic year） Third semester  - 火5～6

  • Basic Physics （Classical Mechanics） 1 （2022academic year） Third semester  - 火5～6

  • Basic Physics （Classical Mechanics） 1 （2022academic year） Third semester  - 火5～6

  • Basic Physics （Classical Mechanics） 1 （2022academic year） Third semester  - 火5～6

  • Basic Physics （Classical Mechanics） 1 （2022academic year） Third semester  - 火5～6

  • Basic Physics （Classical Mechanics） 1 （2022academic year） Third semester  - 火5～6

  • Basic Physics （Classical Mechanics） 1 （2022academic year） Third semester  - 火5～6

  • Basic Physics （Classical Mechanics） 1 （2022academic year） Third semester  - 火5～6

  • Basic Physics （Classical Mechanics） 2 （2022academic year） Fourth semester  - 火5～6

  • Basic Physics （Classical Mechanics） 2 （2022academic year） Fourth semester  - 火5～6

  • Basic Physics （Classical Mechanics） 2 （2022academic year） Fourth semester  - 火5～6

  • Basic Physics （Classical Mechanics） 2 （2022academic year） Fourth semester  - 火5～6

  • Basic Physics （Classical Mechanics） 2 （2022academic year） Fourth semester  - 火5～6

  • Basic Physics （Classical Mechanics） 2 （2022academic year） Fourth semester  - 火5～6

  • Basic Physics （Classical Mechanics） 2 （2022academic year） Fourth semester  - 火5～6

  • Basic Physics （Classical Mechanics） 2 （2022academic year） Fourth semester  - 火5～6

  • Basic Physics （Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics （Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics （Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics （Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics （Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics （Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics （Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics （Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics 1（Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics 1（Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics 1（Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics 1（Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics 1（Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics 1（Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics 1（Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Basic Physics 1（Classical Mechanics） （2022academic year） 3rd and 4th semester  - 火5～6

  • Seminar on Industrial Technologies （2022academic year） Late  - 水5,水6,水7,水8

  • Surface Engineering （2022academic year） Prophase  - 木3,木4

  • CAD （2022academic year） 1st and 2nd semester  - 水1～2

  • CAD （2022academic year） 1st and 2nd semester  - 水1～2

  • Basic Mechanical System Drawing （2021academic year） 1st and 2nd semester  - 木5,木6,木7,木8

  • Basic Mechanical System Drawing （2021academic year） 1st and 2nd semester  - 木5,木6,木7,木8

  • Applied Surface Engineering （2021academic year） Late  - その他

  • Fundamentals of Vibration （2021academic year） 1st semester  - 月3,月4,木1,木2

  • Seminar for Mechanical Engineers II （2021academic year） Third semester  - 水5,水6,水7,水8

  • Seminar for Mechanical and Systems Engineers II （2021academic year） Third semester  - 水5,水6,水7,水8

  • Seminar for Mechanical and Systems Engineers II （2021academic year） Third semester  - 水5,水6,水7,水8

  • Seminar for Mechanical Engineers I （2021academic year） 1st semester  - 水5,水6,水7,水8

  • Seminar for Mechanical and Systems Engineers I （2021academic year） 1st semester  - 水5,水6,水7,水8

  • Seminar for Mechanical and Systems Engineers I （2021academic year） 1st semester  - 水5,水6,水7,水8

  • Introduction to Mechanical and Systems Engineering （2021academic year） Prophase  - 金1,金2

  • Research Works for Mechanical and Systems Engineering 1 （2021academic year） Prophase  - その他

  • Research Works for Mechanical and Systems Engineering 2 （2021academic year） Late  - その他

  • Seminar in Machine Design and Tribology （2021academic year） Year-round  - その他

  • Basic Physics （Classical Mechanics） 1 （2021academic year） Third semester  - 火5,火6

  • Basic Physics （Classical Mechanics） 2 （2021academic year） Fourth semester  - 火5,火6

  • Basic Physics （Classical Mechanics） （2021academic year） 3rd and 4th semester  - 火5,火6

  • Basic Physics 1（Classical Mechanics） （2021academic year） 3rd and 4th semester  - 火5,火6

  • Surface Engineering （2021academic year） Prophase  - 木3,木4

  • CAD （2021academic year） 1st and 2nd semester  - 水1,水2

  • CAD （2021academic year） 1st and 2nd semester  - 水1,水2

  • Basic Mechanical System Drawing （2020academic year） 1st and 2nd semester  - 木5,木6,木7,木8

  • Basic Mechanical System Drawing （2020academic year） 1st and 2nd semester  - 木5,木6,木7,木8

  • Applied Surface Engineering （2020academic year） special  - その他

  • Fundamentals of Vibration （2020academic year） 1st semester  - 月3,月4,木1,木2

  • Fundamentals of Vibration （2020academic year） 1st semester  - 月3,月4,木1,木2

  • Research Works for Mechanical and Systems Engineering 1 （2020academic year） Prophase  - その他

  • Research Works for Mechanical and Systems Engineering 2 （2020academic year） Late  - その他

  • Seminar in Machine Design and Tribology （2020academic year） Year-round  - その他

  • Surface Engineering （2020academic year） Prophase  - 木3,木4

  • CAD （2020academic year） 1st and 2nd semester  - 水1,水2

  • CAD （2020academic year） 1st and 2nd semester  - 水1,水2

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