Faculty Profiles - TADA Naoya

MISC - TADA Naoya

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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.

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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.

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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.

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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.

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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.

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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.

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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

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