Faculty Profiles - TADA Naoya

引張せん断試験による異なる表面性状の純チタンと高密度ポリエチレンの接合強度評価

萱嶋千紘, 多田直哉, 上森武, 坂本惇司, 西川紘平

日本機械学会2020年度年次大会論文集 ( 20-1 ) J04202 2020.9

複素数階偏微分法の汎用有限要素法への適用

上森武, 多田直哉, 坂本惇司, 早川邦夫, 成田忍

鋼板のテンションレベラモデリング高度化研究会最終報告会資料 6 2020.9

電流経路に着目したCFRP内部の繊維分布と電位差の関係に関する解析

河本詳平, 多田直哉, 上森武, 坂本惇司

日本機械学会2020年度年次大会論文集 ( 20-1 ) J03312 2020.9

セルロースナノファイバー強化天然ゴムの引張変形に伴う表面高度変化

榊原桃, 多田直哉, 上森武, 坂本惇司, 石田諭史

日本機械学会2020年度年次大会論文集 ( 20-1 ) J03126 2020.9

精密ショットピーニング処理と研磨を施した高速度工具鋼の表面粗さ，残留応力，疲労寿命の関係に関する検討

川西志朗, 多田直哉, 上森武, 坂本惇司, ヌワンカルナティラカ

日本機械学会2020年度年次大会論文集 ( 20-1 ) 2020.9

Ti-6Al-4V合金細線の疲労特性の評価

築原京香, 坂本惇司, 多田直哉, 上森武

日本機械学会2020年度年次大会論文集 ( 20-1 ) J03103 2020.9

表面の微視的不均一変形に基づく材料の破壊予測

多田直哉

2020年度非破壊検査総合シンポジウム概要集 31 - 34 2020.6

Evaluation of Stress Reversal Deformation Behavior of 590 MPa High Tensile Strength Steel Sheet by Using L-Bending Analysis

2020.5

Experimental study on strength differential effect of stainless steel sheet

柴井宏治, 上森武, 多田直哉, 坂本惇司

材料とプロセス(CD-ROM) 33 ( 1 ) 2020.3

Effect of resin film lamination on tensile deformation characteristics of stainless steel foil

信定宥杜, 多田直哉, 坂本惇司, 上森武

材料とプロセス(CD-ROM) 33 ( 1 ) 2020.3

Evaluation of Tensile and Bending Damages of CFRP Laminates by DC Potential Difference Method

SATO Kazuma, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji, KOMOTO Shohei, SUZUKI Natsumi, TAKANASHI Masahiro

02c1 2020.2

Numerical analysis for inhomogeneous compressive deformation of Multi-Layered Ceramic Capacitor block

TAMAO Seijiro, TADA Naoya, UEMORI Takeshi, SAKAMOTO Junji

03b3 2020.2

SUS304における繰返し押込みを用いた疲労き裂進展速度の簡易評価法の検討

内海直人, 坂本惇司, 多田直哉, 上森武

日本金属学会・日本鉄鋼協会中国四国支部第48回若手フォーラム 1st14 2020.2

多軸ランダム振動下のA5056アルミニウム合金の疲労寿命予測

山田朋佳, 坂本惇司, 多田直哉, 上森武, 花光崚太

日本金属学会・日本鉄鋼協会中国四国支部第48回若手フォーラム 1st15 2020.2

曲げ加工による高張力鋼板のバウシンガ効果の数値的予測の可能性

松村宗一郎, 上森武, 多田直哉, 坂本惇司, 中本浩聖, 西山大吾, 成田忍

日本金属学会・日本鉄鋼協会中国四国支部第48回若手フォーラム 2ndt14 2020.2

非比例負荷を受けるステンレス鋼板の機械的特性の評価

佐々木克瑞, 上森武, 多田直哉, 坂本惇司, 柴井宏治, 藤田隼輔

日本金属学会・日本鉄鋼協会中国四国支部第48回若手フォーラム 2nd15 2020.2

多軸ランダム振動下のアルミニウム合金の疲労強度評価

坂本惇司, 山田朋佳, 多田直哉, 上森武, 澁谷忠弘

M&M2019材料力学カンファレンス講演論文集 ( 19-301 ) OS0336 2019.11

純チタン薄膜の引張変形に伴う表面と裏面の微視的高度分布の関係

岸本健太郎, 多田直哉, 上森武, 坂本惇司

日本材料学会第5回材料WEEK材料シンポジウム 207 2019.10

チタン合金細線の疲労への直流電位差法の適用に関する検討

多田直哉, 高木佑輔, 島田侑紀, 上森武, 坂本惇司

日本機械学会2019年度年次大会DVD論文集 ( 19-1 ) J04203 2019.9

引抜き試験による超高分子量ポリエチレン繊維と高密度ポリエチレンの界面強度評価

西川紘平, 多田直哉, 上森武, 坂本惇司, 金銘

日本複合材料学会第44回複合材料シンポジウム予稿集 99 - 100 2019.9

超高分子量短繊維で強化した自己強化ポリエチレンの試験片厚さと引張強さの関係

金銘, 多田直哉, 上森武, 坂本惇司, 西川紘平

日本複合材料学会第44回複合材料シンポジウム予稿集 129 - 130 2019.9

低荷重負荷による表面高度変化を用いた欠陥検出法に関する検討

坂本惇司, 國安隼人, 多田直哉, 上森武

日本機械学会2019年度年次大会DVD論文集 ( 19-1 ) J40106 2019.9

590MPa級高張力鋼板の繰返し塑性変形挙動の実験観察とそのモデル化

上森武, 中本浩聖, 多田直哉, 坂本惇司

日本機械学会2019年度年次大会DVD論文集 ( 19-1 ) J04202 2019.9

590MPa級DP鋼の繰返し引張－圧縮試験とその構成モデル

中本浩聖, 上森武, 多田直哉, 坂本惇司, 早川邦夫

日本鉄鋼協会第178回秋季講演大会「材料とプロセス」 32 ( 2 ) 732 - 732 2019.8

純チタン細線の引張破断位置と結晶粒径分布の関係に関する検討

島田侑紀, 多田直哉, 上森武, 坂本惇司

軽金属学会中国四国支部第11回講演大会講演概要集 2019.8

表面に微小凹凸を有する材料の弾性特性評価に関する有限要素解析

小西裕太, 多田直哉, 上森武, 坂本惇司

軽金属学会中国四国支部第11回講演大会講演概要集 11 2019.8

純チタン多孔板の弾塑性変形に関する有限要素解析

三井孔佑, 多田直哉, 上森武, 坂本惇司

軽金属学会中国四国支部第11回講演大会講演概要集 12 2019.8

低荷重負荷による表面性状変化を用いた内在欠陥の検出

坂本惇司, 國安隼人, 多田直哉, 上森武

日本機械学会材料力学部門M&M若手シンポジウム2019講演論文集 ( 19-14 ) 79 - 80 2019.8

引張せん断試験によるアルミニウム合金／高密度ポリエチレンの接合強度評価

多田直哉, 阿部俊太朗, 上森武, 坂本惇司

日本材料学会第68期学術講演会講演論文集 173 - 174 2019.5

Effect of Surface Treatment on Tensile and Fatigue Properties of High Speed Tool Steel

Nuwan KARUNATHILAKA, Ryota HANAMITSU, Naoya TADA, Takeshi UEMORI, Junji SAKAMOTO, Masahiro KAWANO

217 - 218 2019.5

高張力鋼板の面内繰返し応力－ひずみ応答に与えるひずみ速度の影響

上森武, 多田直哉, 坂本惇司, 中本浩聖, 早川邦夫

日本鉄鋼協会第177回春季講演大会「材料とプロセス」 32 ( 1 ) 307 - 307 2019.3

多結晶純チタンの引張りにおける結晶方位変化を考慮に入れた微視的すべり変形の評価

佐藤宏樹, 多田直哉, 上森武, 坂本惇司

日本金属学会講演概要集2019年春期(第164回)講演大会 55 - 55 2019.3

精密ショットピーニング処理と研磨を施した高速度工具鋼の疲労寿命

花光崚太, ヌワンカルナティラカ, 多田直哉, 上森武, 坂本惇司

日本機械学会中国四国支部第57期総会・講演会講演論文集 ( 195-1 ) 205 2019.2

高張力鋼板の面内繰返し変形におよぼすひずみ速度の影響

嶋村大, 上森武, 多田直哉, 坂本惇司, 中本浩聖

日本金属学会・日本鉄鋼協会中国四国支部第44回若手フォーラム 2019.2

重ね合わせ継ぎ手を用いた高延性アクリル系構造用接着剤の静的せん断強度と疲労強度に関する検討

紙田未来, 上森武, 多田直哉, 坂本惇司, 花光崚太

日本金属学会・日本鉄鋼協会中国四国支部第44回若手フォーラム 2019.2

Evaluation of Short Ultra-High-Molecular-Weight Fiber Effect on Tensile Strenght of Self-Reinforced Polyethylene Composite

Naoya TADA, Takeshi UEMORI, Shuntaro ABE

Abstract, iDICs 2017 Conference and Workshop/SEM Fall Conference 2017

114 Small Height Change on the Surface of PTFE/Metal Fiber Laminated Material during Tension

DOI Yuki, TADA Naoya, ISHIHARA Syuji, YAGI Nobuaki

2016 ( 54 ) "114 - 1"-"114-2" 2016.2

116 Effect of Voids and Interlayer Distance of Dielectric Layers on Compressive Deformation of Multi-Layered Electric Component Block

KAWATA Junya, TADA Naoya, NARUSE Fumio, YAHIRO Toshiaki

2016 ( 54 ) "116 - 1"-"116-2" 2016.2

1017 Investigation on Required Mechanical Properties of Balloon Expandable Stents by Comparative Testing

SUZUKI Tatsuya, SHIMIZU Ichiro, IWATA Daiki, TADA Naoya

2016 ( 54 ) "1017 - 1"-"1017-2" 2016.2

PS0029-417 Evaluation of viscoelastic strain of polymer material during unloading process by digital image correlation method

YODEN Takayuki, UCHIDA Makoto, TADA Naoya

2015 "PS0029 - 417-1"-"PS0029-417-2" 2015.11

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

To evaluate the effect of non-uniform deformation on the elastic and viscous strain during unloading of the polymeric material, strain distribution after loading, unloading were measured by digital image correlation method. Local viscous strain was obtained by removing the elastic strain from total strain cased during unloading. Obtained results clarified that the strain recover in necked region was very small while those caused in necked surrounding region was large.

OS0102-133 Influence of Strain Path Change on Plastic Deformation Behavior of Ti-Nb Alloys under Biaxial Compressions

ISHIKAWA Shinichi, SHIMIZU Ichiro, TAKEMOTO Yoshito, TADA Naoya

2015 "OS0102 - 133-1"-"OS0102-133-2" 2015.11

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

In this study, biaxial compression tests along proportional and non-proportional strain paths were performed on binary titanium-niobium alloys (Ti-Nb alloys) of different niobium contents, in order to clarify the deformation behaviors of those alloys under biaxial loadings. The influences of strain path and niobium content upon the compressive deformation behavior were then investigated. It was found that there were differences on stress-strain relations of Ti-Nb alloys owing to the different primary plastic deformation mechanisms. The clear influence of strain path change on the compressive behavior of Ti-35Nb alloy was observed, probably because of the activation of new twin systems after the path change.

118 Evaluation of Mechanical Properties of Self-Reinforced Polyethylene with Short Ultra-High-Molecular-Weight Fibers

TABATA Hirotsugu, TADA Naoya, UEMORI Takeshi, NAKATA Toshiya

Materials and processing conference 2015 ( 23 ) "118 - 1"-"118-4" 2015.11

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Tensile tests were performed using plate specimens of self-reinforced polyethylene (SRPE) with short ultra-high molecular weight polyethylene (UHMWPE) fibers. The effect of fiber length on the properties was investigated. The specimens were made by hot-pressing the stacked HDPE films with short UHMWPE fibers distributed between each film at high temperature. The SRPE specimens showed much larger elastic modulus and tensile strength than monolithic HDPE specimens while their fracture took place at smaller strain than the monolithic HDPE specimens. Focusing on the effect of UHMWPE fibers, the specimens reinforced with longer fibers of 120 μm showed larger elastic modulus and tensile strength than those reinforced with shorter fibers of 60 μm. It was considered that the difference was attributed to the shearing force between fibers and matrix or pull-out force of fibers during tension taking into consideration the feet that lots of pulled-out fibers were observed on the fracture surface.

J0410301 Deformation behaviors of sheet metals during stress path changes and its constitutive model

UEMORI Takeshi, TADA Naoya

Mechanical Engineering Congress, Japan 2015 "J0410301 - 1"-"J0410301-4" 2015.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The elasto-plastic deformation behaviors of an IF steel sheet during stress path changes were investigated by performing nonproportional tension-compression tests. To evaluate the developed constitutive models in describing nonproportional deformation behaviors, numerical simulations of stress-strain responses were conducted for the same stress paths as the experiments. From the comparisons of experiment and calculations, it was found that the proposed constitutive model can describe well every deformation behaviors of an IF steel sheet during stress path changes.

G0300402 Small Change in Surface Height and Microscopic Deformation in Tension of High-Density Polyethylene

TADA Naoya, MATSUKAWA Yoshitaka

Mechanical Engineering Congress, Japan 2015 "G0300402 - 1"-"G0300402-5" 2015.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Tensile test of high-density polyethylene (HDPE) was performed on the stage of digital holographic microscope (DHM) using plate specimen. The surface height of the order of nano meter was evaluated during tensile test and its change was discussed. Microscopic undulations were observed at small load and the undulations became larger at higher load or displacement. As the height distribution in observation area was similar throughout the tensile test, it seemed that the microscopic deformation was predictable from the surface undulation under small loadings.

G0300705 Study on Alloy Composition Dependent Constitutive Relation under Biaxial Compressions of Binary Titanium-Niobium Alloys

SHIMIZU Ichiro, ISHIKAWA Shinichi, HISADA Kazuki, TADA Naoya, TAKEMOTO Yoshito

Mechanical Engineering Congress, Japan 2015 "G0300705 - 1"-"G0300705-3" 2015.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Titanium alloys with beta-stabilizing elements have excellent characteristics such as high specific strength, good plastic formability and good corrosion resistance. However, the deformation behaviors of those alloys under biaxial loadings are still not clarified. In this study, uniaxial and biaxial compression tests of binary titanium-niobium alloys (Ti-Nb alloys) of different niobium contents were performed. The influences of niobium contents upon the compressive deformation behavior were then investigated. It was found that the primary plastic deformation mechanism changed with the niobium content and with deformation pattern. As a consequence of that, the different type of anisotropic hardening appeared. The niobium content dependency of constitutive relation of Ti-Nb alloys was then discussed using equivalent stress variation based on an anisotropic yield function and plastic work.

Report on the 65th Japanese Joint Conference for the Technology of Plasticity

110 Evaluation of Location and Size of Wall Thinning on the Back Surface of Flat Plate Based on the Potential Difference Distribution

NOHARA Manabu, TADA Naoya

2015 ( 53 ) "110 - 1"-"110-2" 2015.2

114 Study on the Effect of Elastic Anisotropy upon Indentation Load-Displacement Relation of Pure Titanium

IHARA Akihiro, SHIMIZU Ichiro, TADA Naoya

2015 ( 53 ) "114 - 1"-"114-2" 2015.2

112 Evaluation of Time-Dependent Joint Strength of Copper-Cored Lead-Free Solder Ball in Air, Distilled Water and NaCl Solution by Testing Device Using Permanent Magnet

MASAGO Hiroyasu, TADA Naoya, TABATA Hirotsugu

2015 ( 53 ) "112 - 1"-"112-2" 2015.2

113 Influence of Orientation of Copper Mesh on Deformation Response of Copper Mesh/PP Composites

MISE Takato, UCHIDA Makoto, TADA Naoya

2015 ( 53 ) "113 - 1"-"113-2" 2015.2

111 Investigation of Corrosion Resistance of A2024 Aluminum and AZ31 Magnesium Alloys with KURACERA and Sealing Treatments

MORIFUJI Syun, TADA Naoya, MAKINO Yukinobu, SAKODA Nobuaki, SAKO Sayaka

2015 ( 53 ) "111 - 1"-"111-2" 2015.2

Polycrystalline finite element analysis of crystal orientation effect on surface roughness of pure titanium sheet

KAKIHARA Hiroki, UEMORI Takeshi, TADA Naoya

( 155-1 ) 117 2015.2

Engineering Collaboration in Applied Solid Mechanics

Naoya Tada

Proceedings of the 3rd International Symposium on Total Engineering Education 45 - 46 2015

TADA Naoya

Journal of the JSTP 56 ( 649 ) 129 - 130 2015

G0310201 Compressive Plastic Deformation in Micro Areas between Parallel Grooves and in V-shaped Cross-Section Groove Fabricated on Polycrystalline Pure Titanium Surface

SHIMIZU Ichiro, ISOKAWA Katsuhiro, HARA Kousuke, TADA Naoya

Mechanical Engineering Congress, Japan 2014 "G0310201 - 1"-"G0310201-3" 2014.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The compressive deformation behavior in micro areas of industrial pure titanium was investigated, by using a new method in which the deformation constraints from the neighboring areas were reduced by fabricating micro parallel grooves or V-shaped cross-section grooves, by focused ion beam machining. Uniaxial compression test was performed in the direction parallel to the grooves, and the deformation behavior in the areas between the grooves was observed by scanning electron microscopy. The parallel grooves were fabricated to across the deformation twin that appeared by pre-compression, and then the influence of deformation constraint on twinning was discussed. Meanwhile, the V-shaped cross-section grooves were fabricated on several grains to examine the crystal orientation dependency of the deformation of the micro areas. In both cases, the possibility was found to change the primary deformation mechanism in the areas by fabricating micro grooves.

OS0118 Alloy Composition Dependency of Equi-Plastic Work Surfaces in Biaxial Compressions of Ti-Nb Alloys

SHIMIZU Ichiro, HISADA Kazuki, ISHIKAWA Shinichi, TADA Naoya

2014 "OS0118 - 1"-"OS0118-2" 2014.7

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Metastable beta type titanium alloys have been attracting attention in various industrial fields because of their special properties such as high specific strength, good formability, high corrosion resistance, and biocompatibility. However, plastic deformation characteristics of the titanium alloys have scarcely been clarified especially under biaxial loading conditions, despite of their importance on metal forming processes. In the present study, uniaxial and biaxial compression tests were performed on titanium-niobium (Ti-Nb) alloys with four different niobium contents, in order to investigate the influences of beta stabilizer content upon compressive deformations. The microstructure of Ti-Nb alloys was found to change from α, α' to p structure with increase of the niobium content. With this change of microstructure, the primary plastic deformation mechanisms were revealed to change from slip and stress-induced martensite to deformation twin and coarse slip with increase of the niobium content and thus the change influenced on the uniaxial and biaxial compressive plastic behaviors.

115 Deformation Analysis during Production Press Process of Laminated Electronic Component Using Finite Element Method

YAMAJI Ken, TADA Naoya, NARUSE Fumio, YAHIRO Toshiaki

2014 ( 52 ) "115 - 1"-"115-2" 2014

114 Evaluation of Absorbed Energy during Lateral Local Compression and Three-Point Bending of Aluminum Alloy Rectangular Tube by Finite Element Method

ITO Masashi, ONO Tadanori, SHIMIZU Ichiro, TADA Naoya

2014 ( 52 ) "114 - 1"-"114-2" 2014

113 Joint Strength Evaluation of Copper-Cored Lead-Free Solder Ball in Air, Pure Water and 3.5 wt.% NaCl Solution by Testing Device Using Permanent Magnet

MASAGO Hiroyasu, TADA Naoya

2014 ( 52 ) "113 - 1"-"113-2" 2014

1419 Micro-, mezo- to macroscopic modeling of elasto-viscoplastic deformation of polypropylene

UCHEDA Makoto, TADA Naoya

The Computational Mechanics Conference 2013 ( 26 ) "1419 - 1"-"1419-2" 2013.11

OS0402 Comparison between Plastic Deformation Behaviors under Equi-Biaxial Compression and Uniaxial Tension of AZ31 Magnesium Alloy

SHIMIZU Ichiro, NISHIZAKI Seiki, TADA Naoya

2013 "OS0402 - 1"-"OS0402-3" 2013.10

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Tension-compression asymmetry of plastic deformation of magnesium alloys has been known to affect plastic formability in several metal forming processes. However, in most of works on the tension-compression asymmetry, the result of uniaxial tension was compared with that of uniaxial compression. In the present study, the plastic deformation behavior of AZ31 magnesium alloys in uniaxial tension was investigated and compared with those in equi-biaxial compression, in which the macroscopic deformation was equivalent to that of uniaxial tension. It was found that the equi-plastic work point obtained by equi-biaxial compression was on the same isotropic yield curve with that by uniaxial tension, in the early stage of plastic deformation. The crystal orientation measurement results also revealed that the twin area fractions as well as active twin systems by uniaxial tension were almost the same with those by equi-biaxial compression. These results imply that the difference between deformation patterns by uniaxial tension and by uniaxial compression is primary cause of the tension-compression asymmetry of magnesium alloys.

OS0408 Nanometric Change in Surface Height and Microscopic Elasto-Plastic Deformation in Tension of Pure Titanium

TADA Naoya, UCHIDA Makoto, YAGI Nobuaki

2013 "OS0408 - 1"-"OS0408-3" 2013.10

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

A tensile test of pure titanium plate specimen was performed on the stage of digital holographic microscope, and a change in the height of each grain on the surface was evaluated during the tests. The load was increased stepwise in the tensile test and the distribution of height change of each grain was evaluated at all steps in nanometer order. The identification of region before and after each loading step was done by the Digital Height Correlation Method (DHCM). The height change of each grain between low loading levels corresponded to that between relatively high loading levels, which suggests that the height change in plastic deformation occurred mainly by crystallographic slips can be predicted by that in elastic deformation. Slip lines after the plastic deformation were observed and the correlation of the slip lines and height change of the grain was discussed.

G031031 Direct-Current Electric Potential Field Analysis of Plate with Local Wall Thinning of Semi-Ellipsoidal Shape

NOHARA Manabu, TADA Naoya, UCHIDA Makoto

Mechanical Engineering Congress, Japan 2013 "G031031 - 1"-"G031031-4" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The direct-current potential difference method (DC-PDM) is an inspection technique to evaluate defects in structures. Although the method needs large direct current and relatively large equipment, many studies on the applicability of DC-PDM to non-destructive inspection have been performed because of low cost, cheap, and good reproducibility of results. DC-PDM has been applied to evaluate general wall thinning. But very few papers deal with the application of DC-PDM to local wall thinning. In this study, approximated solution for electric potential field analysis of a semi-ellipsoidal wall thinning existing on the back surface of a conductive plate was proposed and its validity was examined by comparing with the results by finite element method. The approximated solution agreed with the finite element analysis.

G031014 Study on Relationship between Microscopic Change in Surface Height and Slip Line Distribution in Pure Titanium during Tension Using Digital Holographic Microscope

YAMAMOTO Yudai, TADA Naoya, UCHIDA Makoto

Mechanical Engineering Congress, Japan 2013 "G031014 - 1"-"G031014-5" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Polycrystalline metals are composed of grains with different crystal orientations and sizes, and show inhomogeneous elastic-plastic deformation behavior. Especially for grains on the surface, the inhomogeneous deformation appears accompanied by the change in the height distribution. On the other hand, recently, digital holographic microscope is used to measure the height distribution on the materials surface with high accuracy in a short time. In this study, a cyclic tensile test of polycrystalline pure titanium was carried out and the change in the height distribution was studied using the digital height correlation method. Increase in average height of each grain by unit load in elastic region correlated with those in plastic region, which suggests that the plastic deformation is predictable from the elastic deformation.

G031022 Observation of Compressive Deformation inside Pure Titanium Grain with Reduced Deformation Constraint by Parallel Grooves

ISOKAWA Katsuhiro, SHIMIZU Ichiro, TADA Naoya

Mechanical Engineering Congress, Japan 2013 "G031022 - 1"-"G031022-4" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

In the present study, a new method to reduce deformation constraint in a grain of industrial polycrystalline pure titanium was introduced, by fabricating micro parallel grooves in the grain by means of a focused ion beam method. Uniaxial compression test was then performed in the direction parallel to the grooves, and the influence of reduced deformation constraint upon the characteristics of plastic deformation in the area between the grooves was investigated. The comparisons of the plastic deformation of the area with that without grooves revealed that the plastic deformation behavior as well as the deformed feature of the grain clearly changed by the presence and absence of the deformation constraint. The influence of deformation constraint upon the plastic deformation behavior of titanium grain was thus discussed with taking into consideration the crystallographic orientation.

G031016 Influence of Alloy Composition upon Biaxial Compressive Deformation Behavior along Proportional Strain Path of Metastable p-Type Titanium-Niobium Alloys at Room Temperature

HISADA Kazuki, SHIMIZU Ichiro, TAKEMOTO Yoshito, TADA Naoya

Mechanical Engineering Congress, Japan 2013 "G031016 - 1"-"G031016-4" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Metastable β-type titanium alloys have many features such as high specific strength, good ability of plastic deformation, excellent corrosion resistance, biocompatibility, and low Young's modulus, which are useful in aerospace, biomedical and chemical industries. However, plastic deformation behaviors of metastable β-type titanium alloys under multi-axial compressive conditions have not been clarified. In the present study, four types of Ti-Nb alloys, Ti-20mass%Nb, Ti-30mass%Nb, Ti-35mass%Nb, and Ti-45mass%Nb were prepared. The uniaxial and biaxial compression tests with proportional strain paths were then performed on Ti-Nb alloys by using a biaxial compression testing machine. The results of uniaxial compression tests revealed that stress induced martensite transformation, deformation twin, coarse slip occurred on Ti-20 and 30Nb, Ti-35Nb, and Ti-45Nb, respectively. It was found by biaxial compression tests that the plastic deformation behavior including anisotropic hardening also changes with Nb content.

G011044 Finite Element Analysis on Evaluation of Crack Position and Size in Pipe-Flange Welded Part by Direct-Current Potential Difference Method

KOSAKA Masaki, TADA Naoya, UCHIDA Makoto

Mechanical Engineering Congress, Japan 2013 "G011044 - 1"-"G011044-4" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Detection of cracks initiated at pipe-flange welded part by using direct current potential difference method had been proposed and the related researches have been conducted. However, the evaluation of the position and shape of the crack has not been discussed. In this study, three-dimensional electric potential field analysis was carried out by finite element method assuming that crack was initiated at the interface between flange and weld metal and effect of the circumferential angle and the central position of the crack on change in potential difference at the boundary between weld metal and flange was evaluated. As a result, potential difference along the circumferential direction significantly changed around the both tips of crack and the position where potential difference shows extreme value approximately corresponded to the crack tips.

J042032 Study on Relationship between Area Fraction of Graphite and Inclination and Position of Tensile Fracture Surface of Gray Cast Iron

INADA Yusuke, TADA Naoya, SHIMIZU Ichiro, IGUCHI Katsuyuki

Mechanical Engineering Congress, Japan 2013 "J042032 - 1"-"J042032-3" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Gray cast iron is used as structural materials for many machines. It has been assumed homogeneous when its strength was evaluated. But it has a composite structure of perlite and graphite. It is necessary to consider its microstructure for accurate strength evaluation of reliable products. In this study, the distribution of graphite was observed by SEM and its area ratio A_G was evaluated in equally divided areas of parallel part of specimen. It was found that high A_G region corresponded to the fracture surface of tensile test. This fact suggests that the position of fracture surface is predictable by the distribution of graphite.

G031071 Deformation and Fracture of A5052 Aluminum Alloy Specimens with Hard Anodic Oxidation and KURACERA Treatments under Uniaxial Tension

MORIFUJI Syun, TADA Naoya, SHIMIZU Ichiro, MAKINO Yukinobu, SAKODA Nobuaki, TAJIRI Sayaka

Mechanical Engineering Congress, Japan 2013 "G031071 - 1"-"G031071-4" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Recently, aluminum alloys are important structural materials because of high specific strength, lightweight, excellent in recycling. Various surface treatments for aluminum alloys have been developed for improvement of corrosion and wear resistances. Among them, environment-friendly anodizing in which oxide coating is formed on the material surface with easy process has been applied to a wide range of structural material. Also, plasma electrolytic oxidation (PEO) treatment was developed. Since KURACERA coating, it is classified PEO coating, is harder than anodic oxide coating, it is expected spacious application. In this study, in order to research the effect of oxide coating on deformation and fracture behavior, hard anodizing and KURACERA treated test specimen were observed with microscope during tensile test and the results were compared. The following results were obtained. With increasing the coating thickness, longitudinal elastic constant of coating, tensile strength and strain at fracture decreased. Longitudinal elastic constant of KURACERA coating was larger than that of hard anodic oxide coating. Also, since surface roughness was large in specimens with thick coating, more stress concentration occurred in thick coating larger and made necking and cracking easy.

J012022 Finite Element Analysis on Evaluation of Crack on Joint Interface between Copper-Cored Lead-Free Solder Ball and Copper by DC-PDM

KAI Tomoki, TADA Naoya

Mechanical Engineering Congress, Japan 2013 "J012022 - 1"-"J012022-5" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

In this study, Direct-Current Potential Difference Method (DC-PDM) was proposed for quantitative evaluation of crack initiation and propagation on joining between copper-cored lead-free solder ball and copper plate specimen when copper plate specimen was subjected to cyclic tension. Finite element method was used for three dimensional potential analysis to clarify the relationship between change in potential difference and change in crack depth. In addition, influence of crack depth and joint condition on potential difference was considered. It was found that the relationship between crack size and potential difference is represented by a master curve with modification coefficient of core independently of joint condition.

G031015 Study on Compressive Forming Limit of Cast AZ31 Magnesium Alloy by Biaxial Compressions with Proportional and Non-proportional Strain Paths

AKIYAMA Daisuke, SHIMIZU Ichiro, TADA Naoya

Mechanical Engineering Congress, Japan 2013 "G031015 - 1"-"G031015-3" 2013.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Magnesium alloys have special features such as light weight, high specific strength, and good reusability. However, information on the compressive formability of magnesium alloys in multi-axial compressive stress conditions is still limited, nevertheless of their importance in plastic working processes such as forging and extrusion. In the present study, biaxial compression tests of initially isotropic cast AZ31 magnesium alloy were performed along proportional and non-proportional strain paths at room temperature. In the tests, the change of microstructure was observed using a scanning electron microscope. The results revealed that the compressive forming limit of AZ31 magnesium alloy was affected not only by the maximum shear stress but also by the hydrostatic stress. The area fraction of twin, which influences on the compressive flow behavior, was found to vary according to the strain paths.

207 Deformation Analysis of Gold Thin Film on Polycarbonate Substrate Subjected to Thermal Change and Tensile Load by Finite Element Method

GERILI Sibuda, TADA Naoya, SHIMIZU Ichiro, HU Yafei

2013 ( 51 ) "207 - 1"-"207-2" 2013.2

208 Absorbed Energy Evaluation during Lateral Local Compression and Three-Point Bending of Rectangular Steel Tube by Plastic Hinge Theory

KOHARA Masato, ONO Tadanori, SHIMIZU Ichiro, TADA Naoya

2013 ( 51 ) "208 - 1"-"208-2" 2013.2

A Fundamental Study on Plastic Deformation of Metastable Beta-Type Ti-Nb Alloys under Uniaxial and Biaxial Compressions

Ichiro Shimizu, Kazuaki Hisada, Naoya TADA, Yoshito TAKEMOTO

Abstract Book of the International Conference on Experimental Mechanics 2013 & the 12th Asian Conference on Experimental Mechanics 48 - 48 2013

Motivation for Scientific Research Reviewed

TADA Naoya

Journal of the Japan Society for Testing Materials 62 ( 7 ) 472 - 472 2013

924 Study on the periodic boundary condition under macroscopic strain gradient

UCHEDA Makoto, TADA Naoya

The Computational Mechanics Conference 2012 ( 25 ) 378 - 379 2012.10

OS0302 Plastic Deformation and Forming Limit of Initially Isotropic Cast AZ31 Magnesium Alloy under Biaxial Compressions at Elevated Temperatures

HIRANO Seiki, SHIMIZU Ichiro, AKIYAMA Daisuke, TADA Naoya

2012 "OS0302 - 1"-"OS0302-2" 2012.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Magnesium alloys have special features such as light weight, high specific strength and good reusability. However, information on the flow behavior and formability of magnesium alloys in multi-axial compressive stress conditions is highly limited, nevertheless of their importance for plastic working processes such as forging and extrusion. In the present study, the uniaxial and biaxial compression tests along proportional strain paths were conducted at room and at elevated temperatures, and thus the influence of strain paths and temperature upon mechanical properties and compressive forming limit were discussed. The results revealed that the flow stress scarcely changes with the test temperature in the range from 493 K to 523 K. On the other hand, the compressive forming limit was found to be dependent on the temperature as well as the strain paths.

J041025 Basic Study on Crystal Orientation Dependency of Uniaxial Compressive Deformation of Micropillar Fabricated in Grain of Pure Titanium

SHIMIZU Ichiro, OKANO Shoutaro, TADA Naoya

Mechanical Engineering Congress, Japan 2012 "J041025 - 1"-"J041025-3" 2012.9

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Titanium is one of materials with hexagonal close-packed structure, in which mechanical twinning often occurs and the plastic behavior becomes rather complicated. In recent years, the compression testing technique of a micropillar fablicated in a grain of metallic material has been developed for the purpose to study the deformation properties of a single crystal structure in a polycrystalline aggregate. In the present study, micropillars with rectangular cross section were fablicated in grains of industrial pure titanium by Focused Ion Beam (FIB) technique. The micro-compression tests were then performed in order to investigate the compressive behavior of single crystal micropillars. It was found that the load-displacement relations obtained by compression tests varied according to the crystal orientation and dimensions of the micropillars. Several traces of mechanical twinning were found to appear on the side surfaces of micropillars after the compression test, when the compressive force was applied in <0001> direction of the titanium grains.

Non-Destructive Evaluation of Damage at Small Joint Interface Using Direct-Current Potential Difference Method

61 ( 9 ) 452 - 457 2012.9

Three-Dimensional Electric Potential Field Analysis of the Relationship between Cracks Initiated at Pipe-Flange Welded Parts and Change in Potential Difference

TADA Naoya, TOKUNAGA Kazuya

61 ( 4 ) 175 - 182 2012.4

107 Change in Surface Profile of Pure Titanium Specimen during Tension Using Digital Holographic Microscope

TAKAHASHI Kousuke, TADA Naoya, UCHIDA Makoto

2012 ( 50 ) 10701 - 10702 2012.2

109 Absorbed Energy Evaluation during Three-Point Bending of Rectangular Steel Tube for Modeling of Vehicle Side Pole Impact

KOHARA Masato, ONO Tadanori, SHIMIZU Ichiro, TADA Naoya

2012 ( 50 ) 10901 - 10902 2012.2

212 Evaluation of Crack Initiation on Au Thin Film during Monotonic Tensile Loading

HU Yafei, TADA Naoya, SHIMIZU Ichiro, SATO Naoyuki, GERILI Subuda

2012 ( 50 ) 21201 - 21202 2012.2

103 Tensile Test of KURACERA Treated Aluminum Alloys

FUKUNAGA Keigo, MAKINO Yukinobu, TADA Naoya, SHIMIZU Ichiro, SAKODA Nobuaki, TAJIRI Sayaka

2012 ( 50 ) 10301 - 10302 2012.2

"マクロおよびナノポーラス金属の開発最前線":中嶋英雄監修（シーエムシー出版発行）

多田直哉

材料 61 ( 2 ) S2 2012

110 Tensile Test of Small Solder Joint Using Permanent Magnets

NISHIHARA Ryo, TADA Naoya

61 19 - 20 2012

101 Relationships between Crack Initiation and Flaky Graphite Distribution during Uniaxial Tension of Gray Cast Iron

INADA Yusuke, TADA Naoya, SHIMIZU Ichiro, IGUCHI Katuyuki

61 1 - 2 2012

626 A Fundamental Study on Compressive Behavior of Pure Titanium Micropillar Fabricated by FIB Technique

ISOKAWA Katsuhiro, SHIMIZU Ichiro, OKANO Shotaro, TADA Naoya

61 383 - 384 2012

504 Three-dimensional Measurement during Tensile Test of HDPE and PP by Time-series Stereo Image Correlation Method

KANAGAWA Tomoya, UCHIDA Makoto, TADA Naoya

61 109 - 110 2012

529 Absorbed Energy Evaluation by Dynamic Lateral Local Compression of Rectangular Metal Tube Simulating Pole Side Impact of Vehicle

ONO Tadanori, SHIMIZU Ichiro, TADA Naoya, TAKUBO Nobuaki

61 365 - 366 2012

Monitoring of Crack on Lead-free Solder Ball/Copper Joint Interface under Cyclic Loading at Constant and Varied Temperature by DC-PDM

51 ( 1 ) 284 - 289 2012

2316 Finite Element Analysis on Influence of Neighboring Graphite on Stress around Flaky Graphite of Cylinder Block of Gray Cast Iron Cylinder Block

IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro

The Computational Mechanics Conference 2011 ( 24 ) 664 - 666 2011.10

303 Compressive Behavior of Micropillar Fabricated in Grain of Pure Titanium by FIB Technique

OKANO Shotaro, SHIMIZU Ichiro, TADA Naoya

The Computational Mechanics Conference 2011 ( 24 ) 44 - 45 2011.10

106 Electric Field Analysis of Evaluation Method of Interface Crack under Solder Ball without Influence of Deformation of Copper Plate Specimen

NISHIHARA Ryo, TADA Naoya, TAKEHARA Ryuji

The Computational Mechanics Conference 2011 ( 24 ) 12 - 14 2011.10

315 Evaluation of Forming Limit in Biaxial Compressions along Proportional Strain Paths of Magnesium Alloys

OKADA Kousuke, SHIMIZU Ichiro, HIRANO Seiki, TADA Naoya

The Computational Mechanics Conference 2011 ( 24 ) 72 - 73 2011.10

207 Effect of Loading Condition on Crack Initiation in Gold Thin Film on Polycarbonate Substrate

SATO Naoyuki, TADA Naoya, SHIMIZU Ichiro, HU Yafei, GERILI Subuda

The Computational Mechanics Conference 2011 ( 24 ) 32 - 33 2011.10

312 Evaluation of microscopic non-uniform deformation of semi-crystalline polymer by means of digital image correlation method

ZHANG Cui, UCHIDA Makoto, TADA Naoya

The Computational Mechanics Conference 2011 ( 24 ) 65 - 66 2011.10

1205 Study on Application of Direct-Current Potential Difference Method to Branched Crack

HOZUKI Atsushi, TADA Naoya, UCHIDA Makoto

The Computational Mechanics Conference 2011 ( 24 ) 416 - 417 2011.10

703 Numerical Simulation of Tensile Deformation Behavior of Semi-crystalline Polymers with Spherulites of Different Sizes

KOBATA Atsushi, UCHIDA Makoto, TADA Naoya

The Computational Mechanics Conference 2011 ( 24 ) 166 - 167 2011.10

307 Absorbed Energy Evaluation during Deformation of Rectangular Steel Tube by Using Plastic Hinge Theory for Modeling of Vehicle Pole Side Impact

ONO Tadanori, SHIMIZU Ichiro, TADA Naoya, HAGA Hideto, KOHARA Masato, TAKUBO Nobuaki

The Computational Mechanics Conference 2011 ( 24 ) 55 - 57 2011.10

311 Three-Dimensional Evaluation of Surface Deformation during Neck Propagation Process of Polymer

TANAKA Shohei, UCHIDA Makoto, TADA Naoya

The Computational Mechanics Conference 2011 ( 24 ) 63 - 64 2011.10

OS2013 Evolution of Plastic Anisotropy and Its Texture Dependency of Industrial Pure Titanium by Biaxial Compression

SHIMIZU Ichiro, IDEI Junya, TADA Naoya

2011 "OS2013 - 1"-"OS2013-2" 2011.7

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The compressive plastic behavior of a commercial grade pure titanium was systematically investigated. Uniaxial and biaxial compression tests with linear strain paths were performed on titanium specimens by means of the original biaxial compression test device. The initial textures of the specimens were controlled using heat-treatment and cold-rolling, in order to investigate the influences of texture and strain paths on the plastic behavior. The results revealed that the initial texture strongly influenced on the yield surface and the anisotropy growth. Area fraction of mechanical twinning was also measured, thus the fraction of twinning was found to vary according to the strain path and then anisotropic hardening was promoted.

GS13 Finite Element Analysis for Stress Distribution around Flaky Graphite of Cylinder Block of Gray Cast Iron

IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro, IMAZU Tomohiro

2011 "GS13 - 1"-"GS13-3" 2011.7

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The stress distribution near the tip of flaky graphite of gray cast iron used for diesel engine cylinder block was calculated by the fmite element method, and compared with results of varied six finite element models, value of theory of stress intensity factor and value of stress concentration factor mutually. The value of stress distribution near the tip of flaky graphite of fmite element model with single hole and value of theory of stress intensity factor and stress concentration factor was almost equal. The ratio of stress distribution near the tip of flaky graphite of fmite element model with single graphite and stress distribution of finite element model with single hole was almost uniform about sampled three graphite. The ratio of stress distribution near the tip of flaky graphite of finite element model with single hole and finite element model with multi holes model was not uniform about sampled three graphite. These results were showed that the stress distribution near the tip of flaky graphite of gray cast iron was influenced by distribution of graphite.

"図解はじめての固体力学－弾性，塑性，粘弾性－":有光隆著（講談社発行）

1716 Life prediction of engine mount considering the effect of creep at high temperatures

Prabhakar SOMA, TADA Naoya, UCHIDA Makoto, SHIGECHIKA Junji, NAKAHARA Kazunari

2011 ( 49 ) 545 - 546 2011.2

1705 Volume Change and Inhomogeneous Deformation of Multilayer Composite Structurein Compressive Process

NARUSE Fumio, TADA Naoya

2011 ( 49 ) 523 - 524 2011.2

1704 Study on Nano-Order Height Change of Grains in Pure Titanium Specimenduring Compression Using Digital Holographic Microscope

YAGI Nobuaki, TADA Naoya, UCHIDA Makoto, TAKAHASHI Kousuke

2011 ( 49 ) 521 - 522 2011.2

1703 Measurement ofThree Dimensional Displacement during Neck Propagation Process of Polymerby Stereo Digital Image Correlation Method

TANAKA Shouhei, UCHIDA Makoto, TADA Naoya

2011 ( 49 ) 519 - 520 2011.2

1503 An Experiment for Static Modeling of Vehicle Deformation by Pole Side Impact

ONO Tadanori, TADA Naoya, SHIMIZU Ichiro, TAKUBO Nobuaki

2011 ( 49 ) 449 - 450 2011.2

1518 Observation of Deformation of Au Thin Film Deposited on Polycarbonate Substrate Subjected to Cyclic Loading

SATO Naoyuki, TADA Naoya, SHIMIZU Ichiro, HU Yafei

2011 ( 49 ) 479 - 480 2011.2

多田直哉

材料 60 ( 7 ) S6 2011

702 Study on Biaxial Compressive Forming Limit along Linear Strain Paths of Initially Isotropic Cast AZ31 Magnesium Alloy

HIRANO Seiki, SHIMIZU Ichiro, TADA Naoya, OKADA Kousuke

60 83 - 84 2011

201 Study on Elastic Modulus Evaluation of Ti-Mo Alloy by Means of Indentation Test with Indenters of Various Shapes

KOBATAKE Tetsuya, SHIMIZU Ichiro, TADA Naoya, KIMURA Noriaki, TAKEMOTO Yoshito

60 135 - 136 2011

208 Numerical Simulation of Micro, Meso and Macroscopic Non-Uniform Deformation of Semi-Crystalline Polymer

UCHIDA Makoto, TADA Naoya

60 149 - 150 2011

1709 Effect of Crack Configuration and Electric Conductivity of Solder Ball on Evaluation of Interface Crack between Solder Ball and Copper by DC-PDM

TADA Naoya, NAKAHARA Ryoichi, YOSHIDA Naoto

The Computational Mechanics Conference 2010 ( 23 ) 453 - 454 2010.9

1105 Effect of development of plastic deformation field on stress-strain relation of the semi-crystalline polymer during tensile test

UCHIDA Makoto, TADA Naoya

The Computational Mechanics Conference 2010 ( 23 ) 127 - 128 2010.9

C204 Detection of Stress Corrosion Cracking on the Surface of Stainless Steel Plate by DC-PDM

MAEDA Hiroki, TADA Naoya, UCHIDA Makoto

National Symposium on Power and Energy Systems 2010 ( 15 ) 329 - 332 2010.6

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

In order to examine the applicability of the direct-current potential difference method to detection of stress corrosion cracking, the potential difference was measured on the surface of stainless steel plates with simulated cracking. Potential difference was measured near the cracking and at the points distant from the crack to evaluate the degree of increase in the potential difference by the crack. The potential difference near the cracking area was higher than that in the other area. The normalized potential difference, which is the ratio of potential difference near the cracking to that far from the area, was 1.03 to 1.50. The result suggests that stress corrosion cracking was able to be detected by direct-current potential difference method.

Prediction of Material's Lives under High Temperature Conditions

107 Observation of deformation of Au thin film deposited on polycarbonate substrate subjected to compressive loading and unloading

HASHIMOTO Kazuki, TADA Naoya, SHIMIZU Ichiro, SATO Naoyuki

2010 ( 48 ) 13 - 14 2010.2

106 Evaluation of Deformation Behavior of Multilayer Composite Structure

NARUSE Fumio, TADA Naoya

2010 ( 48 ) 11 - 12 2010.2

214 Three-Dimensional Finite Element Analysis of the Effect of Copper Wire Delamination and Voids on Evaluation of Interface Crack between Solder Ball and Copper by Direct Current Potential Difference Method

YOSHIDA Naoto, NAKAHARA Ryoichi, TADA Naoya

2010 ( 48 ) 59 - 60 2010.2

TADA Naoya

Journal of the Japan Society of Mechanical Engineers 113 ( 1094 ) 8 - 11 2010.1

239 Effect of Microscopic Heterogeneity on Neck Propagation Behavior of Amorphous Polymers

UCHIDA Makoto, TADA Naoya

59 283 - 284 2010

226 Indentation Behavior of Grains of Ti-14Mo Alloy Deformed Mainly by Twin

SHIMIZU Ichiro, KIMURA Noriaki, TADA Naoya, TAKEMOTO Yoshito

59 257 - 258 2010

G0300-9-3 Deformation Behavior and Density Change of Multilayer Composite Structure during Compression

NARUSE Fumio, TADA Naoya

The proceedings of the JSME annual meeting 2010 255 - 256 2010

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

A lot of multilayer ceramic electric devices, for example MLCCs, are manufactured by stacking the ceramic sheets with printed internal electrodes and pressing it to make a monolithic structure. However, the pressing process also causes non-uniform deformation in the ceramic block and it hinders the realization of MLCCs' downsizing. Therefore, the development of highly accurate press technology has been desired. In this study, experimental study on the compression of block of stacked ceramic sheets was carried out and the change in density of side-gap and the local deformation in the block were investigated. It was found that the change in density of side-gap begins to increase at the onset of compression and become constant at the compressive strain of 10%.

DOI： 10.1299/jsmemecjo.2010.1.0_255

S0304-1-3 Evaluation of Crystal Orientation of Ti-Mo Alloys Using Micro Indentation Test

KIMURA Noriaki, SHIMIZU Ichiro, TADA Naoya, TAKEMOTO Yoshito

The proceedings of the JSME annual meeting 2010 265 - 266 2010

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

In recent years, β-type Ti alloys have been attracting much attention for industrial applications, not only by its high specific strength and superior formability but also by special features such as low elastic modulus and extraordinary plastic deformation behavior. However, the studies on β-Ti alloys are still less than those on other types of Ti alloys. Hence, the evaluation processes of various properties of β-Ti alloys have still not been established nevertheless of their importance for industrial applications. The aim of the present study is to evaluate the crystal orientation of grains of β-Ti alloys by means of micro indentation technique. Ti-14Mo and Ti-20Mo alloys, whose primary deformation mechanisms are mechanical twin and coarse slip, respectively, were employed as typical β-Ti alloys. The detailed investigations were performed on the relationship between the crystal orientation and the indentation behavior. The results revealed that the lines which appeared around the indentation of Ti-14Mo almost corresponded to twin boundaries, while those of Ti-20Mo were slip lines. The distortion of indentation shapes also appeared on both Ti-Mo alloys. Based on these results, the procedure of crystal orientation evaluation by micro indentation test was discussed.

DOI： 10.1299/jsmemecjo.2010.1.0_265

J0301-1-3 Forming Limit of Extruded AZ31 Magnesium Alloy in Biaxial Compressions along Proportional Strain Paths

OKADA Kousuke, SHIMIZU Ichiro, TADA Naoya

The proceedings of the JSME annual meeting 2010 255 - 256 2010

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The deformation twinning of magnesium alloys is known to induce compressive fracture at room temperature. However, the formability in multi-axial compressive stress conditions has scarcely been investigated, nevertheless their importance for plastic working processes such as forging and extrusion. In the present study, biaxial compressive plastic behavior and compressive forming limit of AZ31 magnesium alloy at room temperature were investigated using a unique biaxial compression testing machine. The uniaxial and biaxial compression tests along proportional strain paths were conducted, and thus the influence of strain path upon the mechanical properties and the forming limit were discussed. The compressive forming limit indicated clear strain path dependency. It was also found that the forming limit was influenced by the plastic anisotropy. The adaptability of the typical forming limit criterion to the compressive forming limit was also discussed.

DOI： 10.1299/jsmemecjo.2010.6.0_255

S0305-3-2 Effect of Carbon Black Fraction on the Fatigue Crack Growth Rate of Vulcanized Natural Rubber Used in Engine Mount Applications

SOMA Prabhakar, TADA Naoya, UCHIDA Makoto, NAKAHARA Kazunari, KATAYAMA Minoru

The proceedings of the JSME annual meeting 2010 141 - 142 2010

Language：English Publisher：The Japan Society of Mechanical Engineers

The effect of carbon black loading on fatigue crack growth rate of vulcanized natural rubber used in automotive applications such as engine mounts was studied using pure shear specimens. Tearing energy was calculated from uncut specimens while crack growth rate was calculated from cyclic tests of cut specimens. Finally the fatigue crack growth rate as a function of tearing energy was determined. The fatigue crack growth rate of natural rubber at a given tearing energy was decreased with the increase in fraction of carbon black.

DOI： 10.1299/jsmemecjo.2010.1.0_141

G0300-6-2 Finite Element Analysis for Strength Evaluation of Cylinder Block of Gray Cast Iron Taking into Consideration the Distribution of Flaky Graphite

IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro, IMAZU Tomoihro

The proceedings of the JSME annual meeting 2010 225 - 226 2010

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The stress distribution in gray cast iron used for diesel engine cylinder block was calculated by the finite element method. The distribution of flaky graphite on the surface of the gray cast iron was observed by microscope and it was reproduced in the analysis model. Three models, (I) multiple graphite model, (II) multiple hole model, and (III) single hole model, were used and the stress distribution near the tip of flaky graphite was discussed. The stress intensity factor for critical flaky graphite was approximately calculated. The results of the present analysis suggested that the stress intensity factor for the critical flaky graphite was found to be about 3.7 times as high as that of a single crack with the same length. Furthermore, critical graphite length to the fracture of cylinder block of diesel engine was calculated based on the proposed method. The length was much larger than that of actual graphite.

DOI： 10.1299/jsmemecjo.2010.1.0_225

1511 Effect of Copper Wire Location and Voids on Evaluation of Interface Crack between Solder Ball and Copper by Direct Current Potential Difference Method

NAKAHARA Ryoichi, YOSHIDA Naoto, TADA Naoya

The Computational Mechanics Conference 2009 ( 22 ) 724 - 725 2009.10

903 Numerical simulation of mechanical behavior of polycrystalline metals under macroscopic strain gradient

UCHIDA Makoto, SHIMIZU Ichiro, TADA Naoya

The Computational Mechanics Conference 2009 ( 22 ) 330 - 331 2009.10

OS0317 Biaxial Compressive Plastic Behavior of Hexagonal Close-Packed Metals Including Twinning

SHIMIZU Ichiro, TADA Naoya, IDEI Junya

2009 734 - 735 2009.7

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Uniaxial and biaxial compression tests with proportional strain paths were preformed on industrial pure titanium and AZ31 magnesium alloy, in order to investigate the plastic behavior of hexagonal close-packed metals. Those distinctive features were clarified by comparing with the results of industrial pure iron. The true stress-true strain curves of pure titanium and AZ31 alloy showed constant or increasing strain hardening ratio within a certain range of applied strain, due to deformation twinning. The work contours, namely contours of the equal expenditure of plastic work, were obtained by biaxial compressive stress-strain relations for the study of yielding behavior. The deviation of work contour plots in biaxial compression region became large with the progress of plastic deformation. This fact implies the evolution of anisotropy during biaxial compressions of hexagonal close-packed metals.

534 Crystal Orientation Dependency of Indentation Geometry and Its Surrounding Deformation of Ti-Mo Alloys

205 Effect of Mechanical Properties of Workpieces on Non-axisymmetric Forming by Synchronous Spinning

TANAKA Shuichi, SHIMIZU Ichiro, TADA Naoya

2009 ( 47 ) 55 - 56 2009.2

1010 Fatigue crack growth rate of vulcanized natural rubber and effect of heat aging

SOMA Prabhakar, TADA Naoya, UCHIDA Makoto, KATAYAMA Minoru, NAKAHARA Kazunari

2009 ( 47 ) 345 - 346 2009.2

115 Crystal plasticity analysis of surface undulation of polycrystalline metals occurred by compressive deformation

ANZAI Hiroaki, UCHIDA Makoto, TADA Naoya

2009 ( 47 ) 29 - 30 2009.2

117 Study on Change in Surface Undulation of Pure Titanium Specimen During Compression Using Digital Holographic Microscope

YAGI Nobuaki, TADA Naoya, SHIMIZU Ichiro, NAITOU Takayuki

2009 ( 47 ) 33 - 34 2009.2

KIMURA Noriaki, SHIMIZU Ichiro, TADA Naoya, TAKEMOTO Yoshito, ISHIDA Takahisa

58 359 - 360 2009

523 Study on Plastic Behavior of Pure Titanium during Various Biaxial Compression Strain Paths

IDEI Junya, SHIMIZU Ichiro, TADA Naoya

58 337 - 338 2009

533 Evaluation of Local Deformation of Semi-Crystalline Polymer during Neck Propagation by Digital image Correlation Method

UCHIDA Makoto, KAJIMOTO Tetsuharu, TADA Naoya

58 357 - 358 2009

Grain-by-grain distribution of plastic strain and rotation in polycrystal pure copper and pure nickel specimens subjected to tensile loading

Copper and copper alloy 48 ( 1 ) 259 - 265 2009

S0301-6-3 Study on Stress along the Fillet on Upper Deck of Cylinder Block during Operation and Fatigue Strength by Finite Element Analysis

IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro

The proceedings of the JSME annual meeting 2009 119 - 120 2009

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The static stress by tightening cylinder head bolts and the stress in operation were calculated by using finite element analysis along the fillet on an upper deck of cylinder block with wet liner structure. The stress was calculated based on dynamic balance of cylinder block and its stiffness ratio to cylinder head bolt. The stress distribution before and during operation evaluated by finite element analysis corresponded to the measurement results. The fatigue strength was examined by plotting the stress amplitude and the mean stress on the fatigue limit diagram. The results corresponded to the presence or absence of crack along the fillet of test and prototype engines well.

DOI： 10.1299/jsmemecjo.2009.1.0_119

S0302-1-4 A suggestion of evaluation method for crystallographic orientation of pure titanium by means of micro indentation test

SHIMIZU Ichiro, TADA Naoya, ISHIDA Takahisa

The proceedings of the JSME annual meeting 2009 133 - 134 2009

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Most characteristics of metallic materials are influenced by crystallographic orientation of grains. Measurement of crystal orientation is therefore important for effective use of metallic materials. However, the most methods employed for orientation measurement require expensive apparatus and technical skills. Meanwhile, indentation testing is easy to perform and the imposed micro-indentation geometry on a grain is possible to reflect its crystallographic orientation. The present study aims to establish the method to evaluate crystallographic orientation of grain in polycrystalline metal, based on the indentation geometry. The indentation tests with triangular pyramidal indenter were carried out on pure titanium grains, of which crystal orientations were premeasured by electron backscattered diffraction method. Thus, the relationship between the crystallographic orientation and the indentation geometry was discussed. The results indicated that the directions of <0001> axis and <21^^-1^^-0> axis projected on sample surface were well-correlated with the deviation of te indentation shape from the ideal one. This fact suggests the possibility to evaluate crystallographic orientation by the imposed indentation geometry.

DOI： 10.1299/jsmemecjo.2009.1.0_133

Electric Field Analysis of the Simultaneous Evaluation of Location, Size, and Shape of a Semi-Elliptical Crack on the Back Surface and Plate Thickness Using Direct-Current Potential Difference Method of Multiple-Probe Type

A01 Study on Plastic Deformation in Pure Titanium Grains by EBSD Method and Deposited Marks at Lattice Points

NAITOU Takayuki, TADA Naoya, SHIMIZU Ichiro

2008 1 - 2 2008.10

A07 Continuous Evaluation of Distribution of Local Deformation of Semi-Crystalline Polymers in Tensile Test

KAJIMOTO Tetsuharu, UCHIDA Makoto, TADA Naoya

2008 13 - 14 2008.10

A13 Study on Fracture Condition on the Fillet of Upper Deck of Cylinder Block for Diesel Engine

IMADU Tomohiro, IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro, IWASAKI Kouji

2008 25 - 26 2008.10

B19 Study on Reducing Method of Static Stress along Fillet of Upper Deck of Cylinder Block for Dry Liner by Non-Linear FEA

IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro, Iwasaki Kouji

2008 83 - 84 2008.10

A10 Monitoring of Joined Interface Crack between Lead-Free Solder Ball and Copper in High Temperature Cyclic Tension by DC-PDM

EZAKI Yusuke, TADA Naoya, NAKAHARA Ryoichi

2008 19 - 20 2008.10

OS0617 Tensile Test of Pure Titanium Thin Films with Different Crystal Grain Size Actuated by Thermal Stress

HASHIMOTO Kazuki, TADA Naoya, SHIMIZU Ichiro

2008 "OS0617 - 1"-"OS0617-2" 2008.9

PS30 Study on Evaluation of Microscopic Property of Pure Titanium by Means of Indentation Shape

ISHIDA Takahisa, SHIMIZU Ichiro, TADA Naoya, UCHIDA Makoto

2008 "PS30 - 1"-"PS30-2" 2008.9

TADA Naoya, FUNAKOSHI Akira, UCHIDA Makoto, ISHIKAWA Hiroki

57 ( 3 ) 137 - 141 2008.3

910 Evaluation of Static Strain at the Fillet of Cylinder Block and Depth Optimization of Thread Engagement for Cylinder Head Bolts

IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro

2008 ( 46 ) 343 - 344 2008.2

211 Fundamental study on mechanical properties and microstructure of aluminum sheet with locally heavy-worked area

OGAWA Mitsumasa, SHIMIZU Ichiro, TADA Naoya

2008 ( 46 ) 61 - 62 2008.2

210 Correction of Temperature Effect in Damage Monitoring of Joined Interface between Lead-Free Solder Ball and Copper

TADA Naoya, EZAKI Yusuke, KOBAYAKAWA Yoshiyuki

2008 ( 46 ) 59 - 60 2008.2

131 Influence of Strain Path on Biaxial Compressive Plastic Behavior of AZ31 Magnesium Alloy

SHIMIZU Ichiro, TADA Naoya, NAKAYAMA Kousuke

57 231 - 232 2008

137 Numerical Simulation of Deformation Behavior of Semi-Crystalline Polymer with Spherulitic Morphology Approximated by Voronoi Polygons

UCHIDA Makoto, KINOSHITA Tsuruyo, TADA Naoya

57 243 - 244 2008

209 Experimental Study on Non-Axisymmetric Forming of Metal Sheet by Synchronous Spinning

TANAKA Shuichi, SHIMIZU Ichiro, TADA Naoya

57 - 58 2008

Trial of three-dimensional evaluation of plastic deformation of Crystal grains in polycrystal pure copper plate subjected to tension

Copper and copper alloy 47 ( 1 ) 137 - 141 2008

P036 Study on Plastic Behavior of AZ31 Magnesium Alloy during Various Strain Paths by Means of Biaxial Compression Test Device

NAKAYAMA Kosuke, SHIMIZU Ichiro, TADA Naoya

2007 667 - 668 2007.10

Development of Reverse-type Differential Rotary to Linear Conversion Mechanism and Evaluation of Its Fundamental Characteristics

SHIMIZU Ichiro, SEKI Masanori, TADA Naoya, YOSHIDA Akira

Journal of Japan Society for Design Engineering 42 ( 9 ) 495 - 500 2007.9

211 Three-Dimensional Evaluation of Plastic Deformation on the Surface of Material Based on Shape Change of Indentation

SUGIMOTO Yoshinobu, Uchida Makoto, TADA Naoya

2007 ( 45 ) 57 - 58 2007.3

405 Tension of Pure Titanium Film by Piezo Stage and Evaluation Method of Its Mechanical Properties

UEMORI Kazumasa, TADA Naoya, SHIMIZU Ichiro, TADA Hiroyuki

2007 ( 45 ) 123 - 124 2007.3

206 Finite Element Analysis for Three-Dimensional Evaluation of Material's Deformation Based on Shape Change of Indentation

UCHIDA Makoto, ORITA Takashi, SUGIMOTO Yoshinobu, TADA Naoya

2007 ( 45 ) 47 - 48 2007.3

315 Plastic Strain Distribution and Slip Lines in Grains of Pure Titanium by Means of Deposited Marks at Lattice Points

YAMADA Masato, TADA Naoya, SHIMIZU Ichiro, NAITO Takayuki

2007 ( 45 ) 103 - 104 2007.3

719 Effect of Current Supply Direction on Identification of Semi-Elliptical Crack on the Back Surface by Means of DC-PDM of Multiple-Point Measurement Type

ISHIKAWA Hiroki, FUNAKOSHI Akira, UCHIDA Makoto, TADA Naoya

56 401 - 402 2007

334 Quantitative Evaluation of Distribution of Local Deformation in Tensile Test of Semi-Crystalline Polymers

KAJIMOTO Tetsuharu, UCHIDA Makoto, TADA Naoya

56 285 - 286 2007

2437 Plastic Behavior of Aluminum during Cyclic Biaxial Compression

SHIMIZU Ichiro, TADA Naoya, FUKUOKA Koji

The proceedings of the JSME annual meeting 2007 447 - 448 2007

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The plastic behavior of metallic material is known to be influenced by strain paths. In order to improve the metal working products after severe deformation processes, it is necessary to clarify the resulting mechanical properties and establish the estimation procedure after various large plastic deformation. As one of the approaches for that purpose, the cyclic biaxial compression tests were performed on industrial aluminum to investigate the influence of compressive strain histories upon mechanical behavior. The biaxial compression with arbitrary strain path was achieved by a newly developed biaxial compression test device. We selected the five different cyclic strain paths, by which the material ideally returns to its original shape after deformation. The influences of strain paths were clearly observed on the stress-strain relations. Although the equivalent stress at the end of each deformation cycle was found to increase despite the strain paths, the largest increment of the stress for the cumulative strain was obtained by the sequential plane strain compressions.

DOI： 10.1299/jsmemecjo.2007.1.0_447

1922 Evaluation of Growth of Interface Crack between Solder Ball and Copper

EZAKI Yusuke, TADA Naoya, ANDOU Takahiro, HORI Kazuhiko

The proceedings of the JSME annual meeting 2007 209 - 210 2007

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Growth of crack on the interface between lead-free solder ball and copper was monitored by means of the direct current potential difference method. The solder balls were jointed on the surface of a plate specimen of pure copper and cyclic tension test was carried out. The change in the potential difference of the solder ball increased with the number of cycles and the interface crack was initiated and grew. The relationship between the increase in the potential difference and the cracked area was evaluated and the results were compared with those obtained by the previous electric field analysis. Both results agreed with each other and this suggests that the interface crack can be monitored by the proposed method.

DOI： 10.1299/jsmemecjo.2007.7.0_209

2440 Evaluation of Static Strain at the Fillet of Cylinder Block and the Effect of Tightening Load by Cylinder Head Bolts

IGUCHI Katsuyuki, TADA Naoya, SHIMIZU Ichiro

The proceedings of the JSME annual meeting 2007 453 - 454 2007

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The static strain at the fillet of cylinder block was evaluated by the finite element method based on a single model of a cylinder block. The fillet is stress concentration part of a cylinder block that is used internal combustion engine. The strain along the fillet varied depending on the position, which was mainly attributed to the stiffness of the cylinder block and the location of cylinder head bolts. An appropriate range of the tightening force of cylinder head bolts for fixing was also evaluated. The minimum force was determined from the minimum pressure on the head packing not to leak the combustion gas. The maximum force was determined from the maximum static strain at the fillet of cylinder block above which cracks could be initiated. This method can be used for optimum designing of cylinder block.

DOI： 10.1299/jsmemecjo.2007.1.0_453

253 Computational Simulation of Micro- to Mesoscopic Deformation Behavior of Rubber-toughened Semi-crystalline Polymer Blends

UCHIDA Makoto, KITANORI Yoshiharu, TADA Naoya

The Computational Mechanics Conference 2006 ( 19 ) 401 - 402 2006.11

107 Application of direct-current electrical potential difference method to interface damage between solder ball and copper by cyclic loading

ANDOU Takahiro, TADA Naoya

2006 ( 44 ) 13 - 14 2006.2

108 Three-dimentional electrical potential analysis for monitoring interface crack between solder ball and copper by direct-current electrical potential difference method

KAMITANI Toru, TADA Naoya, ANDOU Takahiro

2006 ( 44 ) 15 - 16 2006.2

402 Evaluation of Crystal Orientation of Pure Titanium by Micro Indentation Shape

SHIMIZU Ichiro, TADA Naoya, TERAUCHI Daichi

Proceedings of the 1992 Annual Meeting of JSME/MMD 2006 199 - 200 2006

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

A crystal orientation is one of important factors that affect the mechanical properties of single- and poly-crystalline metals in deformation processes. X-ray diffraction method and electron back scatter diffraction method are the typical ways to identify the crystal orientation of grains. Although these methods are possible to give accurate results, they need relatively expensive instruments and operation trainings. The present study aims to show the possibility to use an indentation shape made on a grain's surface for the identification of it's crystal orientation in polycrystalline titanium, which is hexagonal close-packed crystal structure. The strong correlation between the indention shape and the crystal orientation was found for the grain of pure titanium. The results also show the possibility to evaluate the direction of c-axis to a fairly good accuracy by introduced procedures.

DOI： 10.1299/jsmezairiki.2006.0_199

3326 Mechanical Behavior of Industrial Pure Titanium during Biaxial Compressive Plastic Deformation with Strain Path Change

SHIMIZU Ichiro, TADA Naoya, SHIBUTANI Kyosuke

The proceedings of the JSME annual meeting 2006 481 - 482 2006

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The understanding of the multiaxial flow behavior of polycrystalline metals is important not only for the process planning but also for the quality assurance of metal working products. In the present study, the biaxial compression experiments with strain path change were performed on industrial pure titanium using a newly developed testing apparatus. The influences of strain path and abrupt path change upon the mechanical behavior were then investigated. The results show that both the strain level at path change and the directional relation between the sequential paths affect the stress-strain relation of the material. It is also found that the plastic anisotropy has influences on the mechanical behavior with regard to the strain histories.

DOI： 10.1299/jsmemecjo.2006.1.0_481

506 Study on Deformation Behavior of Polycrystalline Metal during Biaxial Plastic Compression

SHIMIZU Ichiro, TADA Naoya

The Computational Mechanics Conference 2005 ( 18 ) 827 - 828 2005.11

715 Microscopic Deformation Behavior of Polycrystalline Metal during Tensile Plastic Deformation

WANG Xiaoqun, ABE Takeji, TADA Naoya, TORII Tashiyuki

2005 ( 80 ) "7 - 29"-"7-30" 2005.3

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

It is well-known that the hardness of material is related to its mechanical characteristics. The microscopic inhomogeneity of polycrystalline pure titanium is evaluated by testing the micro hardness of the grain for various grain orientation. Namely, the change in the hardness associated with plastic deformation, and the relation between the deformation of grain and the change of the hardness are studied, by measuring hardness before and after tensile deformation. The strains of respective grains are also measured and the effect of grain size is discussed.

Microscopic Surface Change of Polycrystalline Aluminum duringTensile Plastic Deformation

119 The Effect of Pre-Compression on Mechanical Behavior of Industrial Pure Titanium in Uniaxial and Plane Strain Compressions

SHIBUTANI Kyosuke, SHIMIZU Ichiro, TADA Naoya

2005 ( 43 ) 37 - 38 2005.2

Wang Xiaoqun, Abe Takeji, Tada Naoya, Shimizu Ichiro

Memoirs of the Faculty of Engineering, Okayama University 39 ( 1 ) 7 - 15 2005

ひずみ経路可変型二軸圧縮試験機を用いたアルミニウムの交差効果に関する検討 (日本実験力学会講演論文集 2005年度年次講演会) -- (実験力学分野全般(2))

清水一郎, 多田直哉

日本実験力学会講演論文集 ( 5 ) 64 - 66 2005

1755 Relationship between Shape of Indentation by Nanomdenter and Crystal Orientation on Surfaces of Pure Titanium Grains

Shimizu Ichiro, Tada Naoya, Inoue Takatoshi, Wang Xiaoqun, Hosoi Yasunari

The proceedings of the JSME annual meeting 2005 413 - 414 2005

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The nanoindentation test has been recently developing to evaluate local mechanical properties in micro areas of various materials. In the present study, the nanoindentation tests were performed to grains in polycrystalline pure titanium, which is hexagonal close-packed crystal structure thus has less slip systems than the other crystalline structures. Then the relationship between the crystal orientation and the resultant indentation shape was investigated. The experimental results show the clear orientation dependence of the indentation shape. The obtained hardness value tends to increase when <0001> direction approaches to the direction normal to the sample surface.

DOI： 10.1299/jsmemecjo.2005.1.0_413

834 くし型試験片を用いた純銅細棒の引張り塑性変形に関する微視的検討(塑性変形・変形挙動-III,一般セッション,第53期学術講演会)

234 Changes in Mechanical Properties of Aluminum during Plastic Deformation with Reciprocating Strain Path by Biaxial Compression Test

FUKUOKA Koji, SHIMIZU Ichiro, TADA Naoya

Proceedings of the 1992 Annual Meeting of JSME/MMD 2005 155 - 156 2005

230 Evaluation of Mechanical Properties of Pure Titanium Thin Plate by Tensile Test Method Actuated by Thermal Stress

TADA Hiroyuki, TADA Naoya, SHIMIZU Ichiro, KANAMURA Keigo

Proceedings of the 1992 Annual Meeting of JSME/MMD 2005 145 - 146 2005

Effect of Strain Path on Mechanical Properties of Polycrystalline Metal after Large Plastic Deformation by Biaxial Compression Test

SHIMIZU Ichiro, TADA Naoya

2004 25 - 26 2004.10

Fracture Mechanics 2003に出席して

多田直哉

材料 53 ( 4 ) 471 - 471 2004.4

3D Elasto-Plastic Finite Element Analysis of Deformation Behavior of Sheet Metal in Spinning Process

ASO Masashi, SHIMIZU Ichiro, NAGAYAMA Noriyuki, TADA Naoya

2004 ( 42 ) 121 - 122 2004.3

Observation of Microscopic Deformation Behavior of Ferritic Stainless Steel during Plastic Deformation

KOBORI Masashi, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

2004 ( 42 ) 107 - 108 2004.3

細井康成, 多田直哉, 王暁群, 清水一郎

学術講演会講演論文集 53 541 - 542 2004

829 多結晶金属の引張り塑性変形に伴う表面あれの自己相関関数による評価(塑性変形・変形挙動-II,一般セッション,第53期学術講演会)

宋華林, 阿部武治, 多田直哉

学術講演会講演論文集 53 531 - 532 2004

835 熱応力を利用した薄板引張り試験法に関する実験的検討(塑性変形・変形挙動-III,一般セッション,第53期学術講演会)

金村恵吾, 多田直哉, 清水一郎

学術講演会講演論文集 53 543 - 544 2004

718 EBSD法による多結晶銅の引張りにおける結晶粒の3次元的塑性変形の評価(結晶塑性実解析とマルチスケールモデリング,塑性挙動のモデリングとシミュレーション-ナノからマクロまで-,オーガナイスドセッション5,第53期学術講演会)

近藤了嗣, 多田直哉, 阿部武治

学術講演会講演論文集 53 472 - 473 2004

828 多結晶アルミニウムの引張り塑性変形における微小硬さ変化(塑性変形・変形挙動-I,一般セッション,第53期学術講演会)

王暁群, 阿部武治, 多田直哉, 鳥居太始之

学術講演会講演論文集 53 529 - 530 2004

830 多結晶チタンの繰返し曲げ塑性変形における結晶粒表面形状の定量化に関する検討(塑性変形・変形挙動-II,一般セッション,第53期学術講演会)

岩崎公哉, 阿部武治, 多田直哉, 清水一郎

学術講演会講演論文集 53 533 - 534 2004

Tensile Test of Thin Titanium Plate on the Stage of Microscope Using Thermal Stress

TADA Naoya, SHIMIZU Ichiro, KANAMURA Keigo

The proceedings of the JSME annual meeting 2004 63 - 64 2004

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Tensile test of a thin notched plate of titanium was conducted on the stage of an optical microscope and the deformation and fracture behavior was observed in situ during the test. In the present study, the notched specimen was sandwiched by two transparent and colorless plates of polycarbonate, which were called "loading plates," and both ends of the specimen were adhered on the inner surfaces of these loading plates. As there is a large difference in linear expansion coefficient between the specimen of titanium and these loading plates of polycarbonate, tensile load is generated by heating them uniformly. Moreover, strain gage was attached on the side of the loading plate and the tensile load was evaluated by the strain and Young's modulus of polycarbonate. As the proposed method of tensile test for thin plates is very simple and, in principle, it is possible to reduce the size of specimen and loading plates, it might be extended to the tensile test for small thin films.

DOI： 10.1299/jsmemecjo.2004.1.0_63

Analytical Study on Influence of Mechanical Properties of Workpiece upon Formability in Spinning Process

SHIMIZU Ichiro, TADA Naoya, NAGAYAMA Noriyuki, ASO Masashi

The proceedings of the JSME annual meeting 2004 493 - 494 2004

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Mechanical properties of workpiece materials are important factors affecting the formability and the accuracy of products in metal forming processes. In the present study, an numerical simulations of the simple spinning process of metal plates were performed by using a 3D elasto-plastic finite element method, and the first attempts to clarify the influences of workpiece properties upon the spinning formability were carried out. The stress-strain relation of the workpiece material was found to affect the final dimensions of the workpiece in spinning process. This result is owing to the different strain distribution based on the different mechanical properties of the workpiece. Meanwhile, the initial thickness anisotropy of the material showed minor influences upon the strain distribution of the final shape of the workpiece.

DOI： 10.1299/jsmemecjo.2004.1.0_493

Continuous observation of tensile deformation of polycrystalline pure titanium by scanning probe microscope

LI Yan, ABE Takeji, TADA Naoya, KANAZAWA Masanori

53 ( 7 ) 295 - 301 2003.7

Type IV Damage Evaluation of Weldments Considering the Microscopic Creep Damage Progress

TOKIYOSHI T., KAWASHIMA F., IGARI T., TOMINAGA K., TADA N.

The Thermal and nuclear power 54 ( 7 ) 758 - 765 2003.7

Study of Non-uniform Deformation during Tension of Polycrystalline Titanium and Orientation Measurement by EBSD Method

KAWAMOTO Masashi, ABE Takeji, KONDOU Ryoji, TADA Naoya, SHIMIZU Ichiro

2003 ( 41 ) 1 - 2 2003.2

Micro-Hardness Change During Tensile Plastic Deformation of Titanium

SATO Taketoshi, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

2003 ( 41 ) 3 - 4 2003.2

Evaluation of Microscopic Creep Damage Progress of Heat Affected Zone of Low-Alloy Steel Welds

KAWASHIMA Fumiko, TOKIYOSHI Takumi, IGARI Toshihide, TOMINAGA Kimihiko, TADA Naoya

Proceedings of the 1992 Annual Meeting of JSME/MMD 2003 425 - 426 2003

Observation of Microscopic Inhomogeneous Behavior of Titanium During Plastic Deformation by Laser Scanning Microscope

KANAZAWA Masanori, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

Proceedings of the 1992 Annual Meeting of JSME/MMD 2003 241 - 242 2003

In-Situ Observation of Thin Plate Specimen of Titanium in Tension by Thermal Stress

Kanamura Keigo, Tada Naoya, Shimizu Ichiro

Proceedings of the 1992 Annual Meeting of JSME/MMD 2003 373 - 374 2003

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

In the present study, a new method of tensile test for small and/or thin specimens was proposed where tensile force was generated in the specimen by the thermal stress between the specimen and the loading plate. The basic mechanism of the method is as follows. Thin notched plate specimen was set on the loading plate and both ends of the specimen were adhered to the loading plate with quick-drying glue. As the loading plate has much higher linear expansion coefficient than the specimen, tensile stress was generated in the specimen with simultaneous heating of the specimen and the loading plate. A strain gauge was also glued on the loading plate in order to evaluate the load acting on the specimen. As all devices can be set on the stage of a microscope, in-situ observation of the plate specimen during tension was realized.

DOI： 10.1299/jsmezairiki.2003.0_373

Observation of Orientation Change During Plastic Deformation of Polycrystalline Copper by EBSD Method

Cyclic Tension of Pure Copper Using Small Plate Specimen

Isaki Masaya, Tada Naoya, Abe Takeji

2002 ( 40 ) 47 - 48 2002.2

Non-Destructive Evaluation of a Semi-Elliptical Surface Crack by DC-EPM with Multiple-Type Probe

Okada Masayoshi, Tada Naoya

2002 ( 40 ) 49 - 50 2002.2

Observation of Cyclic Plastic Deformation of Polycrystalline Copper by Laser Scanning Microscope

KANZAKI Norihisa, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

2002 ( 40 ) 127 - 128 2002.2

Observation of Microscopic Deformation Behavior of Polycrystalline Iron During Plastic Deformation

NAKAYAMA Yoshihisa, ABE Takeji, TOMOSADA Satoshi, KONDOU Ryouji, TADA Naoya, SHIMIZU Ichiro

2002 ( 40 ) 101 - 102 2002.2

Change in Surface Profile during Uniaxial Tension of Polycrystalline Aluminum

WANG Xiaoqun, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

2002 ( 40 ) 97 - 98 2002.2

313 プローブ顕微鏡による多結晶チタンの塑性変形の微視的連続観察

李炎, 阿部武治, 多田直哉, 金沢雅典

講演論文集 2002 ( 40 ) 99 - 100 2002.2

Estimation of Plastic Strain of Grains in Tensile Plastic Deformation of Polycrystalline Copper by Image Processing and EBSD method

KONDOU Ryouji, ABE Takeji, TADA Naoya

Proceedings of the 1992 Annual Meeting of JSME/MMD 2002 37 - 38 2002

SPM Observation of Plastic Deformation during Uniaxial Tension of Polycrystalline Titanium

Li Yan, Abe Takeji, Tada Naoya

Proceedings of the 1992 Annual Meeting of JSME/MMD 2002 637 - 638 2002

電位差法による欠陥および材質の非破壊評価

多田直哉

非破壊検査 51 ( 5 ) 258 - 264 2002

Change in Microscopic Surface Profile during Tensile Plastic Deformation of Polycrystalline Aluminum

WANG Xiao qun, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

Proceedings of the 1992 Annual Meeting of JSME/MMD 2002 383 - 384 2002

Non-Destructive Evaluation of Location, Size and Angle of a Semi-Elliptical Surface Crack by DC-PDM with Multiple-Type Probe

TADA Naoya, OKADA Masayoshi

Proceedings of the 1992 Annual Meeting of JSME/MMD 2002 499 - 500 2002

Estimation on Active Slip Plane during Tensile Plastic Deformation of Polycrystalline Copper by EBSD Method

KONDOU Ryouji, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

Proceedings of the 1992 Annual Meeting of JSME/MMD 2002 35 - 36 2002

Kondou Ryouji, Abe Takeji, Tada Naoya, Shimizu Ichiro

Memoirs of the Faculty of Engineering, Okayama University 36 ( 1 ) 1 - 6 2001.12

212 Observation of Tensile Deformation of Polycrystalline Titanium by Probe Microscope

Li Yan, Abe Takeji, Tada Naoya

2001 ( 39 ) 63 - 64 2001.2

217 Observation of Microscopic Surface Change during Plastic Deformation of Polycrystalline metals by Laser-Scanning Microscope

Song Hualin, ABE Takeji, SHIMIZU Ichiro, TADA Naoya

2001 ( 39 ) 73 - 74 2001.2

218 Analysis of Plastic Deformation and Grain Orientation of Polycrystallnine Copper

KONDOU Ryouji, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

2001 ( 39 ) 75 - 76 2001.2

209 Simulation of Elastic Deformation of Inhomogeneous Materials by Body Force Method

OKA Hisato, ABE Takeji, TADA Naoya, SAIMOTO Akihide

2001 ( 39 ) 57 - 58 2001.2

K-0413 Microscopic Observation of Tensile Deformation Behavior of Polycrystalline Titanium

Li Yan, Abe Takeji, Tada Naoya

The proceedings of the JSME annual meeting 1 105 - 106 2001

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The surface morphology of polycrystalline titanium after tensile deformation was investigated by means of scanning probe microscope. It has been shown that the both the free surface roughness and the height different between grain boundaries and inner grain are increased with the increasing strain, and the slip steps in increase linearly with the strain ε for ε<0.3, while remain constant for ε>0.3.

DOI： 10.1299/jsmemecjo.I.01.1.0_105

K-0414 Analysis of Orientation of Polycrystalline Copper during Plastic Deformation

KONDOU Ryouji, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

The proceedings of the JSME annual meeting 1 107 - 108 2001

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Nonuniform deformation of each grain occurs in the plastic deformation of polycrystalline materials. Accordingly, it is necessary to clarity the behavior of deformation of each grain. The characteristics of each grain that constitutes polycrystalline material varies depending on grain orientation. So it is necessary to pay attention to the difference of grain orientation and the effective measurment technique which throw light on complicated grain deformation. In this paper, automatic measurement using electron backscatter difraction techinque in the scanning electronic maicroscope is performed, and the attention is paid on the grain orientation during plastic deformation to analyze relationship between orientation and plastic deformation.

DOI： 10.1299/jsmemecjo.I.01.1.0_107

604 連続転位分布を用いた粒界クリープ・キャビティの先端近傍応力場に関する数値解析

多田直哉, 大谷隆一, 生田裕也

学術講演会講演論文集 50 149 - 150 2001

K-0530 High Temperature Fatigue Strength of Ni-based Single-Crystalline Superalloy, CMSX-2

OHTANI Ryuichi, TADA Naoya, WADA Atsuhide

The proceedings of the JSME annual meeting 1 185 - 186 2001

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

A nickel-based single-crystalline superalloy, CMSX-2 was investigated from the standpoint of high temperature fatigue strength. Three kinds of push-pull fatigue tests were conducted at 1000℃: (1) PP-test under a sinusoidal stress waveform of 1 Hz-frequency at stress amplitude of 300MPa, the number of cycles to rupture, N_f=8,234, (2) CC-test under a trapezoidal one with hold time in tension and compression of 600s each at stress amplitude of 250MPa, N_f=93, and (3) PP_<preCC>-test, which is PP-test carried out after removal of surface oxide film and small cracks generating during preceding CC-test for 47 cycles, N_f=4,318. A distinguished microstructural difference between PP and PP_<preCC> is that γ'-phase kept the initial cubic shape in PP but it changed to spherical in PP_<preCC>-Nearly 10%-increase in total strain range and 50%-decrease in fatigue life of PP_<preCC> as compared with pure PP-fatigue is attributable to the collapse of γ'-phase.

DOI： 10.1299/jsmemecjo.I.01.1.0_185

K-0719 Observation of Microscopic Deformation Behavior of Pure Aluminum using Ultra-Micro Hardness Tester

TSUBOI Tomoaki, ABE Takeji, TADA Naoya, SHIMIZU Ichiro

The proceedings of the JSME annual meeting 1 327 - 328 2001

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

It is well-known that the hardness of material is related to its mechanical characteristics. In the present study, the evaluation of the microscopic inhomogeneity of polycrystalline pure aluminum is performed by measuring the hardness of respective grains with the recently developed ultra-micro hardness tester. The relationship between the increase in the hardness caused by the work-hardening of the metal and the deformation of respective grains are studied.

DOI： 10.1299/jsmemecjo.I.01.1.0_327

K-0415 Observation of Microscopic Surface Change of Polycrystalline Metal During Plastic Deformation

SONG Hualin, ABE Takeji, SHIMIZU Ichiro, TADA Naoya

The proceedings of the JSME annual meeting 1 109 - 110 2001

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The surface roughening is closely related to the inhomogeneity of polycrystalline metals, that is, to the inhomogeneous plastic deformation of respective grains. In the present study, inhomogeneous deformation on the free surface of polycrystalline aluminum during uniaxial tension is studied. The inhomogeneous deformation of grains, which is represented by the area of the grain and the grain boundary length in the free surface, is observed by means of the laser-scanning microscope as a nondestructive method. Discussions are made mainly on the evaluation of inhomogeneous deformation of respective grains in polycrystalline aggregate.

DOI： 10.1299/jsmemecjo.I.01.1.0_109