研究者詳細 - 多田　直哉

論文 - 多田　直哉

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POTENTIAL DIFFERENCE AROUND SEMI-ELLIPTICAL CRACK ON THE OUTER SURFACE OF PIPE FOR NON-DESTRUCTIVE EVALUATION OF CRACK BY DC-PDM 査読

Naoya Tada, Makoto Uchida, Hiroki Maeda

PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE 2010, VOL 5 215 - 222 2010年

Plastic behaviour and forming limit during biaxial compressions of magnesium alloy AZ31 at room temperature

I. Shimizu, N. Tada

ICEM 14: 14TH INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS, VOL 6 6 16001-1-16001-2 2010年

The Effect of Heterogeneity of Microstructure on the Micro- to Macroscopic Non-Uniform Elasto-Viscoplastic Deformation Behavior of Polymeric Material

Makoto Uchida, Naoya Tada

Proceedings of PLASTICITY '10: The Sixteenth International Symposium on Plasticity and Its Current Applications 298 - 300 2010年

Evaluation of Orientation-Dependent Geometry of Micro Triangular Indentation on Grain of Polycrystalline α-Titanium

Ichiro Shimizu, Naoya Tada, Takahisa Ishida

Programme & Abstracts Book of ICEM 2009 4th International Conference on Experimental Mechanics in conjunction with 8th Asian Conference on Experimental Mechanics, ICEM 2009 Organising Committee 7522 60 - 60 2010年

NUMERICAL SIMULATION FOR IDENTIFICATION OF SEMI-ELLIPTICAL CRACK ON THE INNER SURFACE OF PIPE BY MEANS OF DIRECT-CURRENT ELECTRICAL POTENTIAL DIFFERENCE METHOD WITH MULTIPLE-PROBE SENSOR 査読

Naoya Tada, Makoto Uchida, Hiroki Ishikawa

PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE 2009, VOL 5 257 - 263 2010年

解説高温における材料寿命予測法

多田直哉

検査技術 15 ( 10 ) 23 - 29 2010年

解説直流電位差法を用いたき裂評価技術の現状査読

多田直哉, 浜田晴一

非破壊検査 59 ( 5 ) 204 - 208 2010年

A Fracture Mechanics Approach for Evaluating the Effects of Heat Aging on Fatigue Crack Growth of Vulcanized Natural Rubber 査読

Prabhakar Soma, Naoya Tada, Makoto Uchida, Kazunari Nakahara, Yoshifumi Taga

Proc. of the Asian Pacific Conference for Materials and Mechanics 2009, The Japanese Society of Mechanical Engineers a138 2009年

Research and Education in the Field of Applied Solid Mechanics 査読

Naoya Tada

Proc. 2009 International Symposium on Total Engineering Education, East China University of Science and Technology 167 - 174 2009年

Regional Identification by Digital Height Correlation of Nanolevel Surface Profile

TADA N.

SEM 2009 Fall Symposium Technical Program, Advanced Image-Based Measurement Methods : Recent Developments and Applications in Engineering and Medicine 15 - 15 2009年

Electric Field Analysis of Simultaneous Evaluation of Crack on Inner Surface of Pipe and Pipe Wall Thickness Using Direct-Current Potential Difference Method of Multiple-Probe Type 査読

Naoya Tada, Makoto Uchida

Abstract book the 12th International Conference on Pressure Vessel Technology, Korean Society of Pressure Vessels & Piping 563 - 570 2009年

Evaluation of Geometry of Semi-Elliptical Crack by Direct Current Potential Difference Method Based on Potential Difference Distribution in Two Orthogonal Directions

Makoto Uchida, Hiroki Ishikawa, Naoya Tada

Conference Handbook of the 13th Asia-Pacific Conference on Non-Destructive Testing, The Japanese Society for Non-Destructive Inspection 248 248 - 248 2009年

APPLICATION OF DIRECT-CURRENT POTENTIAL DIFFERENCE METHOD TO EVALUATION OF VARIOUS DAMAGES IN CONDUCTIVE MATERIALS 査読

Naoya Tada

PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, VOL 5 183 - 189 2009年

Numerical Study on Reducing Methods of Static Strain along the Fillet on Upper Deck of Diesel Engine Cylinder Block 査読

Katsuyuki Iguchi, Naoya Tada, Ichiro Shimizu, Kouji Iwasaki

Proc. the 12th International Conference on Fracture 2009年

ヘッドボルトの締め付けによって生じるディーゼルエンジンシリンダブロックのトップデッキ隅部における静ひずみに関する有限要素解析

井口克之, 多田直哉, 清水一郎

日本機械学會論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A 74 ( 744 ) 1053 - 1059 2008年8月

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

The distribution of static strain along the fillet on an upper deck of cylinder block and its dependency on the depth of thread engagement for cylinder head bolts were evaluated for a diesel engine by the finite element method. Since the fillet on upper deck is one of the critical parts in the cylinder block that may be cracked by stress and strain concentration, the static strain along the fillet was focused on in this study. In the model, the static tightening force of cylinder head bolts balanced with the total force acting on the cylinder block. A uniform surface pressure calculated by the total force divided by the contact area was given to the upper deck. The following results were obtained.<BR>The static strain along the fillet was dependent on the circumferential direction of cylinder and its value was varied with the depth of thread engagement for cylinder head bolts. The optimum depth of thread engagement was determined to be about 100 mm from the viewpoints of the overall magnitude of strain, the circumferential fluctuation of strain, the change rate of strain against the depth of thread engagement, and the length of cylinder head bolt. The calculated circumferential distribution of the static strain and the tightening force were compared with the measurement results under the optimum depth of thread engagement condition. Both results agreed well and this fact suggests that the present analysis is useful for optimizing the structural design of cylinder block for diesel engines.

DOI： 10.1299/kikaia.74.1053

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00318143567?from=CiNii

熱応力駆動型引張り試験による純チタン切欠き薄膜の引張り

多田直哉, 清水一郎, 上森一真, 多田寛之

日本機械学会論文集. A編 = Transactions of the Japan Society of Mechanical Engineers. A 74 ( 737 ) 137 - 144 2008年1月

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

Tensile tests of notched thin film of pure titanium were carried out on the stage of a digital microscope. Tensile load was generated by the thermal expansion of a pair of polycarbonate loading plates by which the specimen was sandwiched. Since the thermal expansion coefficient of polycarbonate is much larger than that of pure titanium, the specimen was elongated with an increase in the temperature and successfully fractured at the end of the tensile test. The plastic deformation of the notched part of specimen was observed during the test and the stress and strain were evaluated. The obtained stress-strain curve situated between two curves by a commercial tensile testing machine at the room temperature and at 363 K, which approximately corresponds to the maximum temperature of the thermal stress-actuated tensile test. As the mechanism of the proposed tensile test is simple, it is expected to be applicable to much smaller specimens in the future.

DOI： 10.1299/kikaia.74.137

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00307954976?from=CiNii

純チタンにおける微小圧痕形状に及ぼす結晶方位の影響査読

清水一郎, 多田直哉

材料 57 ( 3 ) 249 - 254 2008年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：The Society of Materials Science, Japan

A micro indentation testing has been used to investigate the local mechanical properties of engineering materials. Since the size of indentation becomes much smaller than the average grain size of ordinary metallic materials by that testing, the results must be influenced more or less by the characteristics of each grain in which the indentation is imposed. However, the influences of crystal orientation of the grain upon the indentation results have scarcely been investigated for polycrystalline metals. In the present study, the micro indentation tests were performed on the grains of commercially pure titanium, of which the crystal orientations were evaluated beforehand by an electron back scattering diffraction technique. The relationships between the crystal orientation and the resultant indentation shapes as well as the indentation hardness values were then experimentally investigated. The results showed clear orientation dependences of the indentation shape and indentation hardness for the titanium grains. The anisotropy and the distortion of indentation profile tended to increase, while the obtained indentation hardness tended to decrease with increase in the angle between <0001> direction and the surface normal direction. The distortion of the indentation shape was found to appear due to the pile-up of materials in the limited area around the indentation by the restricted plastic flow with regard to the crystal orientation. These results are supposed to indicate the possibility to use an indentation made on grain's surface for the identification of its crystal orientation in polycrystalline titanium.

DOI： 10.2472/jsms.57.249

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その他リンク： https://jlc.jst.go.jp/DN/JALC/00310940850?from=CiNii

ゴム充てん結晶性ポリマーの変形挙動に及ぼす引張方向とひずみ速度，メゾ構造の影響査読

内田真, 北乘吉晴, 多田直哉

材料 57 ( 3 ) 243 - 248 2008年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：The Society of Materials Science, Japan

To elucidate the deformation behavior of rubber blended semi-crystalline polymers, the micro- to mesoscopic structure and its mechanical behavior was modeled by using large-deformation finite element homogenization method. In this paper, the effect of direction and strain rate of tensile loading, volume fraction of rubber particle and distance between rubber particles was investigated by numerical simulations of uniaxial tension of semi-crystalline polymer with uniformly distributed rubber particles. A series of computational result clarified the followings. The stress in earlier stage of the deformation, where the stress increases linearly with the strain, is high when the volume fraction of rubber particles is small, when distance between rubber particles is small, and when the load is applied parallel to the nearest neighbor direction. That in following stage, where the stress increases non-linearly with the strain, is high when the volume fraction of rubber particles is small and when tensile strain rate is high. Furthermore, change in the local strain rate and mean stress distribution with the increase in the global tensile strain rate is closely related to the distance between rubber particles and tensile direction.

DOI： 10.2472/jsms.57.243

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Effect of Bead Position on Stress Distribution along the Fillet on Upper Deck of Diesel Engine Cylinder Block with Dry Liner Structure 査読

Katsuyuki Iguchi, Naoya Tada, Ichiro Shimizu, Kouji Iwasaki

Proc. ACMFMS2008, Shimane University, Japan 409 - 412 2008年

Strain Path Dependent Plastic Behavior of Aluminum by Unidirectional and Cyclic Biaxial Compressions 査読

Ichiro Shimizu, Naoya Tada

Proc. ACMFMS2008, Shimane University, Japan 165 - 168 2008年

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