研究者詳細 - 多田　直哉

MISC - 多田　直哉

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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年2月

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年2月

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年

114 PTFE/金属繊維積層材の引張りに伴う表面微小高度変化(材料力学III)

土井裕貴, 多田直哉, 石原修二, 八木伸曉

講演論文集 2016 ( 54 ) "114 - 1"-"114-2" 2016年2月

116 積層型電子部品ブロックの圧縮変形に及ぼす誘電体層内空隙及び層間の影響(材料力学III)

川田純也, 多田直哉, 成瀬文雄, 八尋俊明

講演論文集 2016 ( 54 ) "116 - 1"-"116-2" 2016年2月

1017 比較試験に基づくバルーン拡張型ステントに必要な力学的特性の検討(バイオエンジニアリングIII)

鈴木達也, 清水一郎, 岩田大樹, 多田直哉

講演論文集 2016 ( 54 ) "1017 - 1"-"1017-2" 2016年2月

PS0029-417 デジタル画像相関法による高分子材料の除荷過程における粘弾性ひずみの評価

余田昂之, 内田真, 多田直哉

M&M材料力学カンファレンス 2015 "PS0029 - 417-1"-"PS0029-417-2" 2015年11月

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

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 二軸圧縮下におけるTi-Nb合金の塑性変形挙動に及ぼすひずみ経路変化の影響

石川慎一, 清水一郎, 竹元嘉利, 多田直哉

M&M材料力学カンファレンス 2015 "OS0102 - 133-1"-"OS0102-133-2" 2015年11月

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

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 超高分子量短繊維で強化した自己強化ポリエチレンの力学的特性評価

田畑弘継, 多田直哉, 上森武, 中田隼矢

機械材料・材料加工技術講演会講演論文集 2015 ( 23 ) "118 - 1"-"118-4" 2015年11月

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

Tensile tests 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 応力経路変化を伴う金属薄板変形挙動とその材料モデル

上森武, 多田直哉

年次大会 : Mechanical Engineering Congress, Japan 2015 "J0410301 - 1"-"J0410301-4" 2015年9月

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

The 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 高密度ポリエチレンの引張りにおける表面微小高度変化と微視的変形

多田直哉, 松川喜孝

年次大会 : Mechanical Engineering Congress, Japan 2015 "G0300402 - 1"-"G0300402-5" 2015年9月

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

Tensile 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 二元系Ti-Nb合金における二軸圧縮時の合金組成依存型構成関係に関する検討

清水一郎, 石川慎一, 久田一樹, 多田直哉, 竹元嘉利

年次大会 : Mechanical Engineering Congress, Japan 2015 "G0300705 - 1"-"G0300705-3" 2015年9月

記述言語：日本語出版者・発行元：一般社団法人日本機械学会

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 直流電位差分布に基づく平板背面に存在する局部減肉の位置と寸法の推定(材料力学II)

野原学, 多田直哉

講演論文集 2015 ( 53 ) "110 - 1"-"110-2" 2015年2月