氏名

ヨシダ マコト

吉田 誠

職名

教授 (https://researchmap.jp/read0089217/)

所属

(創造理工学部)

連絡先

URL等

WebページURL

http://www.sci.waseda.ac.jp/research/CONTENTS/J/15476112.html

研究者番号
80277847

本属以外の学内所属

兼担

理工学術院(大学院創造理工学研究科)

学内研究所等

理工学総合研究センター

兼任研究員 2003年-2006年

材料技術研究所

兼任研究員 2005年-2006年

自動車用新材料および新製造プロセス研究所

プロジェクト研究所所長 2016年-2019年

各務記念材料技術研究所

兼任研究員 2018年-2018年

理工学術院総合研究所(理工学研究所)

兼任研究員 2006年-2018年

理工学術院総合研究所(理工学研究所)

兼任研究員 2018年-

自動車用新材料および新製造プロセス研究所

研究所員 2016年-2019年

自動車用新材料および新製造プロセス研究所

研究所員 2019年-

学歴・学位

学歴

-1991年 早稲田大学 理工学部 材料工学科
-1996年 早稲田大学大学院 理工学研究科 材料工学専攻 凝固工学研究

学位

博士(工学) 課程 早稲田大学

経歴

1996年-早稲田大学大学院理工学研究科博士後期課程修了。博士(工学)。
1996年-から文部教官 広島大学工学部第一類機械系 助手
2001年-から文部科学教官 広島大学大学院工学研究科 助手
2003年10月-から早稲田大学理工学部 物質開発工学科 助教授
1995年-日本金属学会論文賞()(1999)
日本金属学会金属写真奨励賞

所属学協会

日本金属学会、軽金属学会、複合材料学会、鋳造工学会

受賞

日本鋳造工学会優秀論文賞

2018年05月授与機関:日本鋳造工学会

タイトル:FEM熱応力解析による凝固割れ性予測に及ぼす鋳物の温度場と力学特性の影響

受賞者(グループ):高井 量資, 角田 達也, 川田 康貴, 広原 嶺, 岡根 利光, 吉田 誠

日本鋳造工学会優秀論文賞

2016年05月授与機関:日本鋳造工学会

タイトル:弾塑性クリープ構成式によるADC12合金鋳物の熱応力予測と有効性の実験的検証

受賞者(グループ):志賀 英俊, 佐藤 武志, 神戸 洋史, 本山 雄一, 吉田 誠

日本鋳造工学会論文賞

2009年05月授与機関:日本鋳造工学会

タイトル:Fe-Cr-Si繊維強化マグネシウム合金基複合材料の作製と機械的特性

受賞者(グループ):魚住 久雄, 小林 健太, 白石 透, 勝矢 晃弘, 佐々木 元, 増田 千利, 府山 伸行, 藤井 敏男, 吉田 誠

日本金属学会金属写真奨励賞

2000年03月授与機関:日本金属学会

タイトル:サクシノニトリル一水共晶・偏晶合金の成長形態のその場観察

受賞者(グループ):光山 嘉一郎, 吉田 誠, 佐々木 元, 福山 秀春, 蒼井 一郎, 中江 秀雄

日本金属学会論文賞

1999年11月授与機関:日本金属学会

タイトル:一方向凝固したAl-In偏晶合金の凝固組織に及ぼす重力の影響

受賞者(グループ):吉田 誠, 村尾 伸介, 青井 一郎, 中江 秀雄

日本金属学会論文賞

1995年12月授与機関:日本金属学会

タイトル:溶融Al-Si共晶合金とSiとの個液界面エネルギー測定

受賞者(グループ):宋 基敬, 菊地 俊史, 吉田 誠, 中江 秀雄

研究分野

キーワード

凝固、鋳造、溶融凝固加工プロセス、溶接、自動車用材料

共同研究希望テーマ

軽合金の鋳造凝固に関する研究開発、アルミ・マグネシウム合金基複合材料プロセスに関する研究開発、異種材料の溶接・ろう付け接合技術に関する研究開発

希望連携機関:産学連携、民間を含む他機関等との共同研究等

目的:受託研究、共同研究

研究テーマ履歴

2002年-2005年溶融凝固プロセスを用いた軽合金材料・複合材料・溶接ろう付け技術の研究開発

研究テーマのキーワード:凝固、鋳造、複合材料、溶接、ろう付け

国内共同研究

論文

Image-based modeling of viscoelastic properties of solidifying Al alloys and model validation

Matsushita, A., Mizuno, H., Okane, T. & Yoshida, M.

Journal of Materials Processing Technology263p.321 - 3292019年01月-

DOIlink

Dynamic measurement of constraining force from green sand and casting contraction of gray cast iron during cooling

Ueno, S., Kashimura, H., Sano, Y., Toyoda, T., Makino, H. & Yoshida, M.

Materials Transactions59(6)p.957 - 9622018年01月-

DOIlink

Effect of temperature field and mechanical properties of casting on prediction of hot tearing tendency using FEM thermal stress analysis+1

Takai, R., Tsunoda, T., Kawada, Y., Hirohara, R., Okane, T. & Yoshida, M.

Materials Transactions59(8)p.1333 - 13402018年01月-

DOIlink

Thermal Stress Analysis of Residual Stress in a Cylindrical Aluminum Casting with Cast-in GCI Liner, Taking Recovery Behavior Effect into Account

Motoyama, Y., Ebihara, N., Shiga, H., Sato, T., Kambe, H. & Yoshida, M.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science49(11)p.5619 - 56352018年01月-

DOIlink

A New Theoretical Approach Based on the Maxwell Model to Obtain Rheological Properties of Solidifying Alloys and Its Validation

Matsushita, A., Takai, R., Ezaki, H., Okane, T. & Yoshida, M.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science48(4)p.1701 - 17072017年04月-

DOIlink

A parameterization method of recovery behavior based on initial yield stress – pre-strain diagram for an Al-Si-Cu high pressure die-casting alloy

Motoyama, Y., Saito, G., Ono, H. & Yoshida, M.

Materials Science and Engineering A684p.660 - 6672017年01月-

DOIlink

Crack prediction for a partially solidified lead-free bronze casting using thermal stress analysis

Matsushita, A., Nakazawa, T., Okane, T. & Yoshida, M.

Journal of Materials Processing Technology249p.46 - 562017年11月-

DOIlink

Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

Motoyama, Y., Shiga, H., Sato, T., Kambe, H. & Yoshida, M.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science48(6)p.2960 - 29702017年03月-

DOIlink

Low temperature and low pressure bonding of plateless Cu–Cu substrates by Ag-based transient liquid phase sintering

Muhammad, K. F., Yamamoto, T. & Yoshida, M.

Journal of Materials Science: Materials in Electronics28(13)p.9351 - 93622017年03月-

DOIlink

Low temperature Cu–Cu bonding by transient liquid phase sintering of mixed Cu nanoparticles and Sn–Bi eutectic powders

Khairi Faiz, M., Bansho, K., Suga, T., Miyashita, T. & Yoshida, M.

Journal of Materials Science: Materials in Electronics28(21)p.16433 - 164432017年11月-

DOIlink

Al–5mass%Mg合金の半凝固状態における粘塑性の冷却速度依存性の予測と実験的検証

広原 嶺, 川田 康貴, 高井 量資, 大瀧 光弘, 岡根 利光, 吉田 誠

軽金属67(6)p.214 - 2212017年-

DOIlink

Prediction and experimental validation of cooling rate dependence of viscoplastic properties in a partially solidified state of Al-5 mass%Mg Alloy

Hirohara, R., Kawada, Y., Takai, R., Otaki, M., Okane, T. & Yoshida, M

Materials Transactions58(9)p.1299 - 13072017年-

DOIlink

Analysis of partially pulsating fatigue process on carbon steel with microstructural observation

Shimano, H., Faiz, M. K., Hara, A., Yoshizumi, K., Yoshida, M

Materials Science and Engineering A651p.83 - 882016年01月-

DOIlink

Dynamic measurements of the load on gray cast iron castings and contraction of castings during cooling in furan sand molds

Marumoto, N., Kashimura, H., Yoshida, K., Toyoda, T., Okane, T. & Yoshida, M.

Journal of Materials Processing Technology237p.48 - 542016年11月-

DOIlink

Effect of Mn addition on the age-hardening behavior of an Al-(9-10)%Si-0.3%Mg die casting alloy in T5 and T6 heat treatment

Fukasawa, K., Mohri, R., Ohtake, T., Inoue, T., Kuroda, A., Kambe, H. & Yoshida, M.

Materials Transactions57(6)p.959 - 9652016年-

DOIlink

Elasto-Plastic-Creep Constitutive Equation of an Al-Si-Cu High-Pressure Die Casting Alloy for Thermal Stress Analysis

Motoyama, Y., Shiga, H., Sato, T., Kambe, H. & Yoshida, M.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science47(11)p.5598 - 56082016年-

DOIlink

Grain refinement effects on the strain rate sensitivity and grain boundary sliding in partially solidified Al-5 wt%Mg alloy

Takai, R., Kimura, S., Kashiuchi, R., Kotaki, H. & Yoshida, M.

Materials Science and Engineering A667p.417 - 4252016年06月-

DOIlink

Mechanical Properties of a Partially Solidified Cu-Zn Alloy

Kasuya, N., Nakazawa, T., Matsushita, A., Okane, T. & Yoshida, M.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science47(4)p.1661 - 16672016年02月-

DOIlink

Verification of the Mechanism of Grain Refinement by Ultrasonic Treatment of Aluminum-4 Wt Pct Silicon Molten Alloy

Matsuda, K., Takehara, T., Yang, M., Uno, H., Kubo, T., Miyano, G. & Yoshida, M.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science47(4)p.2509 - 25162016年03月-

DOIlink

Development of an elasto-viscoplastic constitutive equation for an al-mg alloy undergoing a tensile test during partial solidification

Takai, R., Matsushita, A., Yanagida, S., Nakamura, K. & Yoshida, M.

Materials Transactions56(8)p.1233 - 12412015年-

DOIlink

Analysis of a pulsating fatigue process on carbon steel with different carbide shapes

Hara, A., Kitazawa, R., Yoshida, M. & Horibe, S

Materials Science and Engineering A590p.218 - 2232014年01月-

DOIlink

Effect of stacking fault energy on pulsating fatigue behavior for fcc metals under the fully repeated loading

Sakaki, S., Yoshida, M. & Horibe, S.

Materials Science and Engineering A607p.1 - 52014年06月-

DOIlink

Verification of the simulated residual stress in the cross section of gray cast iron stress lattice shape casting via thermal stress analysis

Motoyama, Y., Inukai, D., Okane, T. & Yoshida, M.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science45(4)p.2315 - 23252014年-

DOIlink

A verification of the thermal stress analysis, including the furan sand mold, used to predict the thermal stress in castings

Motoyama, Y., Inoue, Y., Saito, G. & Yoshida, M.

Journal of Materials Processing Technology213(12)p.2270 - 22772013年-

DOIlink

半凝固状態における引張試験を用いたAl–Mg系合金の弾粘塑性構成式の構築

高井 量資, 松下 彬, 柳田 章吾, 中村 浩一郎, 吉田 誠

軽金属63(9)p.310 - 3172013年-

DOIlink

Dynamic measurements of the load on castings and the contraction of castings during cooling in sand molds

Motoyama, Y., Takahashi, H., Inoue, Y., Shinji, K. & Yoshida, M.

Journal of Materials Processing Technology213(2)p.238 - 2442013年02月-

DOIlink

各種チタン合金の完全片振り疲労挙動に及ぼすクリープと荷重繰り返しの影響

長谷 玄一郎, 北澤 留弥, 吉田 誠, 堀部 進

日本金属学会誌77(10)p.455 - 4602013年10月-

DOIlink

Effect of sand mold models on the simulated mold restraint force and the contraction of the casting during cooling in green sand molds

Inoue, Y., Motoyama, Y., Takahashi, H., Shinji, K. & Yoshida, M., 2013

Journal of Materials Processing Technology213(7)p.1157 - 11652013年-

DOIlink

マグネシウム合金 ZK60 の疲労過程に及ぼす双晶変形と時効の影響

谷口 俊介, 北澤 留弥, 田中 義久, 吉田 誠, 堀部 進

日本金属学会誌77(10)p.448 - 4542013年10月-

DOIlink

耐熱マグネシウム合金半凝固射出成形材の凝固割れ感受性評価

藤井 敏男, 山本 元道, 篠崎 賢二, 三澤 亮太, 永井 淳嗣, 吉田 誠, 田中 達也

軽金属63(6)p.223 - 2282013年-

DOIlink

炭素鋼S45C の片振り疲労寿命に及ぼす圧縮予歪の影響

玉木 裕和, 北澤 留弥, 吉田 誠, 堀部 進

日本金属学会誌77(11)p.503 - 5082013年11月-

DOIlink

各種金属材料の片振り/両振り疲労における繰返し応力-歪曲線を用いた疲労寿命の支配因子の検討

小森 有祐美, 渡部 絵梨子, 戸田 桃子, 北澤 留弥, 吉田 誠, 堀部 進

日本金属学会誌77(8)p.295 - 2992013年08月-

DOIlink

Numerical and experimental study on residual stress in gray cast iron stress lattice shape casting

Motoyama, Y., Takahashi, H., Okane, T., Fukuda, Y. & Yoshida, M.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science44(7)p.3261 - 32702013年-

DOIlink

Relationship between Masing behavior and dislocation structure of AISI 1025 under different stress ratios in cyclic deformation

Watanabe, E., Asao, T., Toda, M., Yoshida, M. & Horibe, S.

Materials Science and Engineering A582p.55 - 622013年10月-

DOIlink

Al–Si–Cu系ダイカスト合金の半凝固状態の引張特性

進士 啓太, 高橋 弘樹, 本山 雄一, 吉田 誠

軽金属63(7)p.253 - 2592013年-

DOIlink

Ni 基超合金 Inconel 718 の固相線温度近傍における力学特性値の引張速度依存性

荻野 章太, 大橋 翼, 粕谷 直生, 吉田 誠

日本金属学会誌77(5)p.170 - 1732013年05月-

DOIlink

Al–Mg合金およびAl–Si合金におけるAE法を用いた凝固割れ発生の判断基準

松下 彬, 遠藤 至, 吉田 誠

軽金属62(3)p.104 - 1082012年-

DOIlink

Development of a device for dynamical measurement of the load on casting and the contraction of the casting in a sand mold during cooling

Motoyama, Y., Takahashi, H., Inoue, Y., Shinji, K. & Yoshida, M.

Journal of Materials Processing Technology212(6)p.1399 - 14052012年06月-

DOIlink

Ni基超合金Inconel 718の固相線温度近傍における力学特性取得に関する検討

大橋 翼, 後藤 亮介, 武藤 健治, 吉田 誠

日本金属学会誌76(2)p.148 - 1542012年02月-

DOIlink

半溶融および半凝固状態のAl–Mg系合金の力学特性の比較

座間 淳志, 利光 万弘, 渡部 智也, 千葉 浩行, 鳥山 隆成, 吉田 誠

軽金属61(9)p.446 - 4512011年-

DOIlink

その場観察によるアルミニウム合金の固液共存温度域における力学的特性の取得

千葉 浩行, 植木 徹, 鳥山 隆成, 遠藤 至, 小林 昂光, 吉田 誠

軽金属61(4)p.135 - 1412011年-

DOIlink

高周波誘導加熱を用いたAl–Mg系合金の半溶融状態の力学特性取得法の開発

座間 淳志,中澤 嵩,利光 万弘,吉田 誠

軽金属61(5)p.181 - 1862011年-

DOIlink

アルミニウム合金の凝固過程におけるアコースティック・エミッション検知方法の発展

植木 徹, 遠藤 至, 松下 彬, 吉田 誠

軽金属61(7)p.334 - 3402011年-

DOIlink

Al–9%Si–0.3%Mgダイカスト合金のT5熱処理挙動における予備時効条件の影響

井上 達也, 後藤 真英, 山口 篤司, 大竹 哲生, 黒田 明浩, 吉田 誠

軽金属61(10)p.507 - 5122011年-

DOIlink

Prediction method of crack sensitivity during DC casting of Al-Mn and Al-Mg alloys

Morishita, M., Abe, M., Tokuda, K. & Yoshida, M.

Materials Transactions52(2)p.166 - 1722011年02月-

DOIlink

AE法と可視化手法を用いたAl–7 mass%Si合金の凝固割れ検知

遠藤 至,千葉 浩行,植木 徹,鳥山 隆成,吉田 誠

軽金属60(10)p.486 - 4912010年-

DOIlink

アルミニウムDC鋳造中のスプラッシュ発生に及ぼす水冷条件の影響

森下 誠, 阿部 光宏, 吉田 誠

軽金属60(8)p.379 - 3852010年-

DOIlink

超音波含浸pitch系炭素繊維強化Al–Mg合金基複合材料の引張強さに及ぼす高温保持の影響

溝口 郁美, 山口 翔, 谷内 滋昭, 吉田 誠

軽金属60(8)p.396 - 4022010年-

DOIlink

Al–Fe–Si三元系合金のミクロ偏析とFe系化合物の晶出モデル

森下 誠, 石田 斉, 吉田 誠

軽金属60(4)p.157 - 1632010年-

DOIlink

AE法を用いたAl–7 mass%Si合金の凝固割れ検知のためのAE信号の分離

遠藤 至, 千葉 浩行, 植木 徹, 鳥山 隆成, 吉田 誠

軽金属60(10)p.492 - 4982010年-

DOIlink

Effect of grain refiner and grain size on the susceptibility of Al-Mg die casting alloy to cracking during solidification

Kimura, R., Hatayama, H., Shinozaki, K., Murashima, I., Asada, J. & Yoshida, M.

Journal of Materials Processing Technology209(1)p.210 - 2192009年01月-

DOIlink

超音波含浸PAN系炭素繊維強化Al–Mg合金基複合材料の引張強さに及ぼす高温保持の影響

山口 翔, 三國 淳, 溝口 郁美, 松永 格, 篠崎 賢二, 吉田 誠

軽金属59(5)p.241 - 2472009年05月-

DOIlink

レーザ表面溶融条件が SUS316 系ステンレス鋼の耐粒界腐食性に及ぼす影響

武藤 健司, 古川 正英, 酒井 潤一, 吉田 誠

日本金属学会誌73(5)p.340 - 3452009年05月-

DOIlink

炭素系繊維強化アルミニウム複合材料の熱伝導特性に及ぼす諸因子の影響

魚住 久雄, 中西 宏太, 井上 健太郎, 塚田 高行, 府山 伸行, 藤井 敏男, 吉田 誠

軽金属59(10)p.562 - 5682009年10月-

DOIlink

DC鋳造におけるAl–Mn系およびAl–Mg系アルミニウム合金の割れ感受性予測方法

森下 誠, 阿部 光宏, 徳田 健二, 吉田 誠

軽金属59(8)p.417 - 4232009年08月-

DOIlink

凝固割れの発生理論と固液共存状態の合金の力学特性取得方法の発展(1950–70年代)

渡部 智也, 木村 亮介, 中澤 嵩, 千葉 浩行, 田中 宗平, 植木 徹, 鳥山 隆成, 吉田 誠

軽金属58(8)p.395 - 4052008年08月-

DOIlink

凝固割れの発生理論と固液共存状態の合金の力学特性取得方法の発展(1980年代以降

渡部 智也, 木村 亮介, 中澤 嵩, 千葉 浩行, 田中 宗平, 植木 徹, 鳥山 隆成, 吉田 誠

軽金属58(9)p.464 - 4722008年09月-

DOIlink

Fabrication process of carbon nanotube/light metal matrix composites by squeeze casting

Uozumi, H., Kobayashi, K., Nakanishi, K., Matsunaga, T., Shinozaki, K., Sakamoto, H., Tsukada, T., Masuda, C. & Yoshida, M.

Materials Science and Engineering A495p.282 - 2872008年11月-

DOIlink

超音波含浸炭素繊維強化Al–Mg合金基複合材料の引張強さに及ぼす界面反応の影響

三國 淳, 野々川 和幸, 松永 格, 篠崎 賢二, 吉田 誠

軽金属58(1)p.27 - 322008年01月-

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Effect of acoustic cavitation on ease of infiltration of molten aluminum alloys into carbon fiber bundles using ultrasonic infiltration method

Matsunaga, T., Ogata, K., Hatayama, T., Shinozaki, K. & Yoshida, M.

Composites Part A: Applied Science and Manufacturing38(3)p.771 - 7782007年03月-

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BN 界面相を有する焼結 SiC 繊維強化 SiO2-ムライト複合材料の作製と酸化挙動

永久 堅也, 下條 泰広, 佐々木 元, 吉田 誠

日本金属学会誌71(2)p.275 - 2832007年02月-

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Fabrication of continuous carbon fiber-reinforced aluminum-magnesium alloy composite wires using ultrasonic infiltration method

Matsunaga, T., Matsuda, K., Hatayama, T., Shinozaki, K. & Yoshida, M.

Composites Part A: Applied Science and Manufacturing38(8)p.1902 - 19112007年08月-

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Fabrication process of carbonaceous fiber reinforced Al and/or Mg alloy(s) composites by squeeze casting

Uozumi, H., Kobayashi, K., Masuda, C. & Yoshida, M.

Advanced Materials Research15p.209 - 2142007年-

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超音波含浸法を用いた炭素繊維強化アルミニウム合金系プリフォームワイヤの製造

松永 格, 松田 謙治, 畑山 東明, 篠崎 賢二, 天沼 成一, 潘 進, 吉田 誠

軽金属56(1)p.28 - 332006年01月-

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超音波含浸炭素繊維強化Al-Mg合金複合材料ワイヤの引張強さに及ぼすMg濃度の影響

松永 格, 松田 謙治, 畑山 東明, 篠崎 賢二, 天沼 成一, 吉田 誠

軽金属56(2)p.105 - 1112006年02月-

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超音波振動印加時における溶融アルミニウム合金中の音響キャビテーションの発生挙動

松永 格, 緒方 研二, 畑山 東明, 篠崎 賢二, 吉田 誠

軽金属56(4)p.214 - 2202006年04月-

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超音波含浸法を用いた炭素繊維バンドルへの溶融アルミニウム合金の含浸機構

松永 格, 緒方 研二, 畑山 東明, 篠崎 賢二, 吉田 誠

軽金属56(4)p.226 - 2322006年04月-

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Prediction Method of Crack Sensitivity during DC Casting of Al-Mn and Al-Mg Alloys

Morishita, Makoto;Abe, Mitsuhiro;Tokuda, Kenji;Yoshida, Makoto

MATERIALS TRANSACTIONS52(2)p.166 - 1722011年-2011年

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ISSN:1345-9678

Mechanical Properties of Inconel 718 Nickel-Based Superalloy around Solidus Temperature

Ohashi, Tsubasa;Goto, Ryosuke;Muto, Kenji;Yoshida, Makoto

JOURNAL OF THE JAPAN INSTITUTE OF METALS76(2)p.148 - 1542012年-2012年

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ISSN:0021-4876

Development of a device for dynamical measurement of the load on casting and the contraction of the casting in a sand mold during cooling

Motoyama, Yuichi;Takahashi, Hiroki;Inoue, Yuki;Shinji, Keita;Yoshida, Makoto

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY212(6)p.1399 - 14052012年-2012年

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ISSN:0924-0136

Dynamic measurements of the load on castings and the contraction of castings during cooling in sand molds

Motoyama, Yuichi;Takahashi, Hiroki;Inoue, Yuki;Shinji, Keita;Yoshida, Makoto

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY213(2)p.238 - 2442013年-2013年

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ISSN:0924-0136

Effect of sand mold models on the simulated mold restraint force and the contraction of the casting during cooling in green sand molds

Inoue, Yuki;Motoyama, Yuichi;Takahashi, Hiroki;Shinji, Keita;Yoshida, Makoto

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY213(7)p.1157 - 11652013年-2013年

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ISSN:0924-0136

Numerical and Experimental Study on Residual Stress in Gray Cast Iron Stress Lattice Shape Casting

Motoyama, Yuichi;Takahashi, Hiroki;Okane, Toshimitsu;Fukuda, Yoya;Yoshida, Makoto

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE44A(7)p.3261 - 32702013年-2013年

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ISSN:1073-5623

Tensile Rate Dependency of Mechanical Properties of Inconel 718 Nickel-Based Superalloy around Solidus Temperature

Ogino, Shota;Ohashi, Tsubasa;Kasuya, Naoki;Yoshida, Makoto

JOURNAL OF THE JAPAN INSTITUTE OF METALS77(5)p.170 - 1732013年-2013年

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ISSN:0021-4876

Investigation of the Dominating Mechanism of Fatigue Life for Various Alloys with CSSC on R=0 and-1

Komori, Ayumi;Watanabe, Eriko;Toda, Momoko;Kitazawa, Rumi;Yoshida, Makoto;Horibe, Susumu

JOURNAL OF THE JAPAN INSTITUTE OF METALS77(8)p.295 - 2992013年-2013年

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ISSN:0021-4876

A verification of the thermal stress analysis, including the furan sand mold, used to predict the thermal stress in castings

Motoyama, Yuichi;Inoue, Yuki;Saito, Gota;Yoshida, Makoto

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY213(12)p.2270 - 22772013年-2013年

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ISSN:0924-0136

Effect of Twinning and Aging Treatment on Fatigue Process of ZK60 Magnesium Alloys

Taniguchi, Shunsuke;Kitazawa, Rumi;Tanaka, Yoshihisa;Yoshida, Makoto;Horibe, Susumu

JOURNAL OF THE JAPAN INSTITUTE OF METALS77(10)p.448 - 4542013年-2013年

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ISSN:0021-4876

Effect of Creep and Cyclic Loading on Pulsating Fatigue Behavior for Various Ti Alloys under Stress Ratio R=0

Nagatani, Gen-ichiro;Kitazawa, Rumi;Yoshida, Makoto;Horibe, Susumu

JOURNAL OF THE JAPAN INSTITUTE OF METALS77(10)p.455 - 4602013年-2013年

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ISSN:0021-4876

Influence of Compressive Pre-Strain on Tensile Fatigue Life in Carbon Steel S45C

Tamaki, Hirokazu;Kitazawa, Rumi;Yoshida, Makoto;Horibe, Susumu

JOURNAL OF THE JAPAN INSTITUTE OF METALS77(11)p.514 - 5212013年-2013年

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ISSN:0021-4876

Analysis of a pulsating fatigue process on carbon steel with different carbide shapes

Hara, Asato;Kitazawa, Rumi;Yoshida, Makoto;Horibe, Susumu

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING590p.218 - 2232014年-2014年

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ISSN:0921-5093

Verification of the Simulated Residual Stress in the Cross Section of Gray Cast Iron Stress Lattice Shape Casting via Thermal Stress Analysis

Motoyama, Yuichi;Inukai, Daiki;Okane, Toshimitsu;Yoshida, Makoto

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE45A(4)p.2315 - 23252014年-2014年

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ISSN:1073-5623

アルミニウム合金を中心とした凝固割れ発生のクライテリアの理論に関するレビュー(1980年代まで)

座間 淳志;吉田 誠

鋳造工学 = Journal of Japan Foundry Engineering Society82(9)p.583 - 5892010年09月-2010年09月 

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ISSN:13420429

1990年代以降におけるアルミニウム合金を中心とした凝固割れ研究の世界動向

座間 淳志;遠藤 至;吉田 誠

鋳造工学 = Journal of Japan Foundry Engineering Society82(11)p.697 - 7012010年11月-2010年11月 

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ISSN:13420429

ADC12合金ダイカストにおける介在物の発生過程

高木 航;吉田 誠

鋳造工学 = Journal of Japan Foundry Engineering Society83(10)p.579 - 5852011年10月-2011年10月 

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ISSN:13420429

半溶融および半凝固状態のAl-Mg系合金の力学特性の比較

座間 淳志;利光 万弘;渡部 智也;千葉 浩行;鳥山 隆成;吉田 誠

軽金属61(9)p.446 - 4512011年09月-2011年09月 

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ISSN:04515994

Ni基超合金 Inconel 718 の固相線温度近傍における力学特性取得に関する検討

大橋 翼;後藤 亮介;武藤 健治;吉田 誠

日本金屬學會誌76(2)p.148 - 1542012年02月-2012年02月 

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ISSN:00214876

Al-9%Si-0.3%Mgダイカスト合金のT5熱処理挙動における予備時効条件の影響

井上 達也;後藤 真英;山口 篤司;大竹 哲生;黒田 明浩;吉田 誠

軽金属61(10)p.507 - 5122011年10月-2011年10月 

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ISSN:04515994

概要:Effect of pre-aging conditions on T5 heat treatment behavior of Al–9.0%Si–0.3%Mg die-casting alloy was investigated by using hardness measurement, differential scanning calorimetric analysis (DSC) and transmission electron microscopy (TEM). T5 treated alloy showed the positive effect on the two-step aging at pre-aging temperatures between 273 and 343 K, unlike T6 treated alloy which showed the negative effect at pre-aging temperatures below 343 K. The positive effect on two-step aging seems to be the characteristic behavior at T5 heat treatment. Difference of two-step aging behavior between T5 and T6 treatments seems to result from the difference of cluster (1) formed in the pre-aging process below 343 K. Higher water-quenching temperature after casting tended to increase the hardness after artificial aging.

Al-Mg合金およびAl-Si合金におけるAE法を用いた凝固割れ発生の判断基準

松下 彬;遠藤 至;吉田 誠

軽金属62(3)p.104 - 1082012年03月-2012年03月 

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ISSN:04515994

低圧鋳造法によるアルミニウム合金製大型・薄肉・中空車体鋳物の製造技術開発

小岩井 修二;橘内 透;八下田 健次;神戸 洋史;岡根 利光;山懸 裕;吉田 誠

鋳造工学 = Journal of Japan Foundry Engineering Society84(8)p.477 - 4812012年08月-2012年08月 

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ISSN:13420429

車体の軽量化と剛性向上を目指した新しいアルミニウム合金低圧鋳造プロセスの開発

吉田 誠;橘内 透;八下田 健次;神戸 洋史;岡根 利光;小岩井 修二;山縣 裕

自動車技術66(9)p.56 - 602012年09月-2012年09月 

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ISSN:03857298

鋳物人

吉田 誠

鋳造工学 = Journal of Japan Foundry Engineering Society84(9)p.554 - 5552012年09月-2012年09月 

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ISSN:13420429

Ni基超合金 Inconel 718 の固相線温度近傍における力学特性値の引張速度依存性

荻野 章太;大橋 翼;粕谷 直生;吉田 誠

日本金屬學會誌77(5)p.170 - 1732013年05月-2013年05月 

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ISSN:00214876

概要:  Nickel-based superalloys have been applied to gas turbine and aircraft jet engine parts due to superior high temperature strength and corrosion resistance. However, casting defect such as solidification cracking often occurs. In order to increase productivity of precision casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE (Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties in the state of solid-liquid coexistence.    In the previous reports, high temperature mechanical properties were examined but tensile rate dependency wasn't examined. In this study, high temperature (around solidus temperature) mechanical properties and tensile rate dependency of their alloy were examined by using originally developed tensile test.

鋳物人 岩堀弘昭

岩堀 弘昭;吉田 誠

鋳造工学 = Journal of Japan Foundry Engineering Society85(7)p.470 - 4712013年07月-2013年07月 

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ISSN:13420429

各種金属材料の片振り/両振り疲労における繰返し応力-歪曲線を用いた疲労寿命の支配因子の検討

小森 有祐美;渡部 絵梨子;戸田 桃子;北澤 留弥;吉田 誠;堀部 進

日本金屬學會誌77(8)p.295 - 2992013年08月-2013年08月 

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ISSN:00214876

概要:  Most studies on CSSC (cyclic stress-strain curve) have been conducted in the condition of the stress ratio R=−1. There are few reports on the effect of mean stress on CSSC. In this study, the stress-controlled fatigue tests under R=0 and −1 were performed on JIS S25C (AISI 1020), IF steel, A2024-T6, A6061-T6 and Ti-6Al-4V alloys. CSSCs of R=0 and −1 were compared. Creep strain (ratcheting strain) was also measured to investigate dominating mechanism of fatigue life of these alloys. It was found that the effect of mean stress on CSSC was different with each alloy. The dominating mechanism of JIS S25C and IF steel was creep strain. However, the dominating mechanism of A2024-T6 and A6061-T6 was plastic strain amplitude. The dominating mechanism of Ti-6Al-4V alloy was both creep strain and plastic strain amplitude. Thus, fatigue life reduction caused by mean stress in Ti-6Al-4V alloy was remarkably occurred than the other alloys.

マグネシウム合金ZK60の疲労過程に及ぼす双晶変形と時効の影響

谷口 俊介;北澤 留弥;田中 義久;吉田 誠;堀部 進

日本金屬學會誌77(10)p.448 - 4542013年10月-2013年10月 

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ISSN:00214876

概要:  For magnesium alloy ZK60 with different heat treatments, controlled plastic strain amplitude fatigue tests were conducted. Effects of twinning and aging treatments on fatigue process were investigated by analyzing the second derivative of hysteresis half-loop. It is found that during compression the convex peak appears at the strain where twinning begins. It is also found that during tension the convex peak appears at the strain where detwinning begins and the concave peak appears at the strain where slip begins to be predominant. Analyzing the strain at the convex peak in compression at the plastic strain amplitude of 6×10−3, for solution treated material and over-aged material twinning hardens with increasing cycle. On the other hand, for T6 material twinning softens from 5 cycle to Nf/5 cycle and then hardens from Nf/5 cycle to Nf/2 cycle. It was suggested that residual twins cause twinning hardening. It was also suggested that cut and dissolution of rod-like precipitates should cause twinning softening. Due to different states of precipitates of materials, the twinning softening appeared for only T6 material at the plastic strain amplitude of 6×10−3. Moreover, the softening were not found for T6 material under the plastic strain amplitude of 4×10−3.

各種チタン合金の完全片振り疲労拳動に及ぼすクリープと荷重繰り返しの影響

長谷 玄一郎;北澤 留弥;吉田 誠;堀部 進

日本金屬學會誌77(10)p.455 - 4602013年10月-2013年10月 

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ISSN:00214876

概要:  It is well known that creep at room temperature remarkably occurs in alpha-Ti alloys. Cyclic creep also appears. Moreover, Ti alloys have different crystal structures and various mechanical properties. Although the cyclic creep behavior and the cyclic softening behavior have been studied, integrated effect of them on fatigue life has not been clarified yet. In this study, fatigue behavior under stress ratio R=0, on Ti alloys of three crystal structures, is investigated. Influence of the cyclic creep and fatigue damage, and influence of the crystal structure to fatigue life are examined. As the results, it is found that as to the alpha-Ti, creep is the dominant damage factor. On the other hand, as to the beta-Ti alloy, fatigue is the dominant damage factor. As to the alpha+beta-Ti alloy, both creep and fatigue are the dominant damage factors (intermediate type). Furthermore, it is found that the area ratio and grain diameter of alpha phase, the spacing between different phases, should influence on cyclic creep strain rate.

Ni基超合金Inconel 718の固相線温度近傍における力学特性取得に関する検討

大橋 翼;後藤 亮介;武藤 健治;吉田 誠

日本金屬學會誌76(2)p.148 - 1542012年-2012年

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ISSN:0021-4876

概要:  Nickel-based superalloys have been applied to gas turbine and aircraft jet engine parts due to superior high temperature strength and corrosion resistance. However, casting defect such as solidification cracking often occurs. In order to increase productivity of precision casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE(Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties in the state of solid-liquid coexistence. In this study, we try to get high temperature (around solidus temperature) mechanical properties of the nickel-based superalloy such as Inconel 718 by using originally developed tensile test. In the previous reports, flat distribution of temperature in the gage length, and crack initiation strain were not ensured. On the other, the developed device ensured within 3℃ of the temperature distribution in the gage length as to the Inconel 718. Tensile strain was measured by using in-situ observation of marker on the surface of the specimen. As a result, Stress-Strain curve, crack initiation stress, and crack initiation strain of Inconel 718 were obtained.

AE法と可視化手法を用いたAl‐7 mass%Si合金の凝固割れ検知

遠藤 至;千葉 浩行;植木 徹;鳥山 隆成;吉田 誠

軽金属60(10)p.486 - 4912010年-2010年

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ISSN:0451-5994

概要:Detection of AE signals of solidification cracking of Al–7mass%Si alloy was attempted with in situ microscopic observation on the surface of casting using high speed camera. During solidification, it was found that AE signal from the casting with crack was higher than AE signal from the casting without crack. As a result of observation of casting using high speed camera, it was found that a rise of AE signal corresponded to initiation of solidification cracking. This stage was the stage of eutectic solidification. Thus, AE signals of solidification cracking should be generated during eutectic solidification. However, AE signals from the casting without cracking were also detected during solidification. This means that AE signals other than solidification cracking should be generated during solidification. Therefore, AE signals detected during eutectic solidification is not necessarily AE signals of solidification cracking. In order to detect AE signals of solidification cracking, it is necessary to separate AE signals of solidification cracking and other than solidification cracking.

Al‐Fe‐Si三元系合金のミクロ偏析とFe系化合物の晶出モデル

森下 誠;石田 斉;吉田 誠

軽金属60(4)p.157 - 1632010年-2010年

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ISSN:0451-5994

概要:In order to develop high quality aluminum alloy products, modeling to predict a behavior of solute distribution in dendrite and precipitation within the inter-cell region quantitatively is important. However Scheil's and Brody-Flemings's equations can't find the precipitation behavior during solidification because a diffusion in liquid phase is not considered. Numerical analysis methods typified by "Phase Field" are more effective but a calculation time has not been enough short to apply industrial use, yet. Consequentially a mathematical model is developed based on the Matsumiya's calculus of finite differences for analyzing inter-cell microsegregation and precipition. Diffusion of solutes in both the solid and liquid is taken into consideration, and realistic mesh shape to calculate microsegregation is conducted for finite difference calculation at this Matsumiya's model. But the calculus hardly predict precipitation behavior, since liquid concentration shift by precipitation during solidification is not considered. Then we improved the model to estimate precipitation of intermetallic compounds by thermodynamics database in this work. Additionally evaluation method of microsegregation used by EPMA was developed. Consequently, we built a new segregation model, which could predict both the microsegregation and the kinds and amount of intermetallic compounds.

超音波含浸pitch系炭素繊維強化Al‐Mg合金基複合材料の引張強さに及ぼす高温保持の影響

溝口 郁美;山口 翔;谷内 滋昭;吉田 誠

軽金属60(8)p.396 - 4022010年-2010年

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ISSN:0451-5994

概要:Carbon fiber reinforced aluminum alloy composites (CF/Al composites) are expected to be applied to electric power cable due to superior specific strength and specific modulus. It is reported that CF/Al composites form aluminum carbide (Al4C3) at the interface between carbon fiber and aluminum alloy. However, in operating condition (300°C, 36 years), the growth of Al4C3 and tensile strength of CF/Al composites have not been clarified. In this study, at first, pitch-based CF (XN-60)/Al composites are fabricated with ultrasonic infiltration method and held at 300, 450, 500°C for a given length of time. Secondary, influence of holding temperature on the quantity of Al4C3 was investigated. Thirdly, relationship between the quantity of Al4C3 and tensile strength of CF/Al composites was examined. As holding temperature increased, the quantity of Al4C3 increased and tensile strength decreased. Reaction kinetics calculation indicated that remaining strength versus theoretical strength (ROM) of the CF/Al composites, held at 300°C for 36 years, was 0.81. That is, it should be better for applying the pitch-based CF/Al composites to electric power cable than the PAN-based CF/Al composites.

その場観察によるアルミニウム合金の固液共存温度域における力学的特性の取得

千葉 浩行;植木 徹;鳥山 隆成;遠藤 至;小林 昂光;吉田 誠

軽金属61(4)p.135 - 1412011年-2011年

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ISSN:0451-5994

概要:It is necessary to obtain the mechanical properties of semi-solid alloy in order to predict the occurrence of solidification cracking, one of the serious casting defects of aluminum alloy die-casting and DC casting, by computer simulation. New in-situ measuring method for mechanical properties on semi-solid aluminum alloy by horizontal tensile test, based on that of Oya and Kitaoka et al., was developed. The strain was determined by measuring the displacement between dendrites defined as the makers. Influence of gage length on the fracture strain was clarified. Fracture strain and tensile strength of semi-solid Al–7mass%Si alloy were obtained.

半溶融および半凝固状態のAl‐Mg系合金の力学特性の比較

座間 淳志;利光 万弘;渡部 智也;千葉 浩行;鳥山 隆成;吉田 誠

軽金属61(9)p.446 - 4512011年-2011年

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ISSN:0451-5994

概要:In our previous works, tensile test devices for both semi-liquid and semi-solid aluminum alloys were developed. In this report, comparison of mechanical properties such as ultimate tensile strength (UTS) and fracture strain between semi-liquid and semi-solid Al–Mg alloy was examined. Difference of the mechanical properties will be caused by the microstructural change during heating process in the tensile test of semi-liquid alloy. By constant load creep test to the semi-liquid alloy, about 90% deformation of permanent and 10% of elastic deformation were found. Thus, in the thermal-stress analysis, solid–liquid co-existence aluminum alloy should be dealt as visco–elastic or viscoelasto–plastic material rather than elasto-plastic material.

Al–Mg合金およびAl–Si合金におけるAE法を用いた凝固割れ発生の判断基準

松下 彬;遠藤 至;吉田 誠

軽金属62(3)p.104 - 1082012年-2012年

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ISSN:0451-5994

概要:Detection of solidification cracking of JIS AC7A aluminum alloy and Al–7%Si alloy was attempted by using acoustic emission method. In order to detect AE of solidification cracking, we investigated about AE signals of gas porosity, shrinkage cavity, and fracture in the semi-solid tensile test. The frequency bands of these casting defects were 150 kHz or less, so the source characterization of AE signals were difficult by that. Therefore we discussed and suggested value of integrated AE peak volt as an indicator of crack initiation. As a result, we proved value of time integral (IAP) is beneficial for eutectic alloy and value of temperature integral (TIAP) is beneficial for noneutectic alloy. We also suggested value of time temperature integral (DIAP) as the criterion of crack initiation which is beneficial for eutectic and non-eutectic alloy.

Al–Si–Cu系ダイカスト合金の半凝固状態の引張特性

進士 啓太;高橋 弘樹;本山 雄一;吉田 誠

軽金属63(7)p.253 - 2592013年-2013年

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ISSN:0451-5994

概要:True stress–true strain curve of JIS AD12.1 (A383.0) alloy was obtained by tensile test in the partial solidification state for predicting residual stress and distortion of aluminum castings. It was found that tensile strength in true stress–true strain curves decreased with increasing temperature and decreasing strain rate. In addition, most of true stress–true strain curves showed constant stress with increasing strain. Thus, the constitutive equation taking account of strain-rate-dependence and stress saturation in the partial solidification state should be used in the thermal-stress analysis during solidification. Material constants of Norton creep law of JIS AD12.1 alloy in the partial solidification state were successfully obtained for the first time in the world.

グラウンドアンカーで耐震補強した鋼矢板式岸壁の耐震性に関する振動台実験および有効応力解析

吉田 誠;清宮 理;三藤 正明;田代 聡一;合田 和哉

構造工学論文集 A57p.63 - 742011年-2011年

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詳細

ISSN:1881-820X

概要:Seismic behavior of sheet pile quay walls with ground anchor for seismic reinforcement is not clarified enough, because few case study of seismic behavior has been conducted. In this study, shaking table tests with a scale of 1 to 17 model in 1G field were conducted to investigate seismic behavior of sheet pile quay walls with ground anchor. And effective stress analyses were conducted to simulate seismic behavior of sheet pile quay walls with ground anchor in this tests. By arrangement of the ground anchors, displacement of the quay wall was fairly constrained and effectiveness of them was confirmed by the test and the analysis.

グラウンドアンカーの耐震補強効果に関するケーソン式岸壁の模型振動実験

吉田 誠;田代 聡一;合田 和哉;清宮 理

土木学会論文集A1(構造・地震工学)66(1)p.233 - 2412010年-2010年

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ISSN:2185-4653

概要:アンカーで耐震補強された岸壁の耐震性は数値解析などで確かめられてはいるが,実際の地震時挙動を確認した事例は少なく,アンカーによる耐震補強効果について十分には明らかにされていない.そこで,グラウンドアンカーによるケーソン式岸壁の耐震補強効果を明らかにすることを目的として,大型水中振動台による模型振動実験を実施した.その結果,ケーソン変位抑制時のアンカーおよび岸壁の動的挙動を明らかにするとともに,ケーソン式岸壁にアンカーを適用した場合の留意点を指摘した.さらに,本実験を対象として,ケーソンの滑動,転倒および支持力について安定計算を行った結果,耐震補強によるケーソン安定性向上への貢献度がケーソンの破壊モードに応じて異なることが明らかになった.

グラウンドアンカーによる重力式岸壁の耐震補強に関する研究

吉田 誠;清宮 理

土木学会論文集A1(構造・地震工学)69(1)p.69 - 882013年-2013年

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ISSN:2185-4653

概要: 本研究では,グラウンドアンカーで補強された重力式岸壁の模型振動実験および有効応力解析による実験の再現解析を実施した.その結果,グラウンドアンカーで補強した場合,ケーソンの水平抵抗力が増加するとともに,基礎捨石の変形が抑制されることでケーソン変位が低減し,かつ基礎捨石層厚の違いによる岸壁の挙動の差異が小さくなった.また,地震時におけるアンカーの張力と伸びの関係は,履歴ループを描き非線形な特性を示した.さらに,有効応力解析において,アンカー張力の非線形特性を反映することで,岸壁の変形およびアンカー張力の再現性が向上した.

高周波誘導加熱を用いたAl‐Mg系合金の半溶融状態の力学特性取得法の開発

座間 淳志;中澤 嵩;利光 万弘;吉田 誠

軽金属61(5)p.181 - 1862011年-2011年

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ISSN:0451-5994

概要:Solidification cracking is one of the defects of casting. In order to increase productivity of DC casting and various shape casting processes, predicting the occurrence of solidification cracking by using CAE (Computer Aided Engineering) should be essential. Therefore, it is necessary to obtain mechanical properties of solid-liquid coexistence alloys. However, in the previous reports, flat distribution of temperature in the gage length was not ensured. In this study, tensile test device for a semi-liquid Al–Mg alloy with 2°C of the temperature distribution in the gage length (Max. 10 mm) was developed. Tensile strain was measured by using in-situ observation of marker on the surface of the specimen. As the result, stress-strain curves and fracture strain in various temperatures on the semi-liquid Al–4.3mass%Mg alloy were measured. It is also found that tensile strain tends to be higher at neighborhood of the crack. Thus, strain depends on the gage length. From the observation of the fracture surface and estimation of Scheil-Gulliver micro-segregation, microstructure of the specimen were supposed to change due to the heating process.

アルミニウム合金の凝固過程におけるアコースティック・エミッション検知方法の発展

植木 徹;遠藤 至;松下 彬;吉田 誠

軽金属61(7)p.334 - 3402011年-2011年

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ISSN:0451-5994

耐熱マグネシウム合金半凝固射出成形材の凝固割れ感受性評価

藤井 敏男;山本 元道;篠崎 賢二;三澤 亮太;永井 淳嗣;吉田 誠;田中 達也

軽金属63(6)p.223 - 2282013年-2013年

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ISSN:0451-5994

概要:New tentative semi-solid injection molding machine for magnesium alloy which was able to control solid fraction from 0 to 30% was developed. The solidification cracking susceptibility of the heat-resistant magnesium alloy containing 4% Al and 3% Ca fabricated by semi-solid injection molding and die-casting were investigated. The critical strain for solidification cracking of the magnesium alloy was obtained by U-type hot cracking test using in-situ observation method. High temperature ductility curve between liquidus and solidus temperatures were compared with semi-solid injection molding and die-casting. As result, solidification cracking susceptibility of semi-solid injection molding process with solid fraction of 25% was better than that of die-casting.

半凝固状態における引張試験を用いたAl–Mg系合金の弾粘塑性構成式の構築

高井 量資;松下 彬;柳田 章吾;中村 浩一郎;吉田 誠

軽金属63(9)p.310 - 3172013年-2013年

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ISSN:0451-5994

概要:In order to predict the hot tearing during DC casting by using thermal stress analysis, constitutive equations in both solid–liquid coexisting and below solidus of alloy are inevitable. However, previous constitutive equations used in hot tearing predictions have no less than one problem as follows. (1) Testing methods of obtaining material constants weren't appropriate. Firstly, elastic strain reversibility was unconfirmed. Secondary, flat distribution of temperature in gauge length of specimen wasn't guaranteed. Thirdly, strain was measured from not local strain but cross head displacement. Fourth, the melt-back phenomenon was unavoidable in partial melting method which was caused by homogenization of segregation structure. (2) Temperature dependence of strain rate sensitivity of stress wasn't considered. (3) Some material constants were not obtained experimentally but guessed. In this study, elasto-viscoplastic constitutive equations (Hooke's and Norton's laws) for both partial solidification and below solidus were developed. In order to obtain material constants experimentally, two tensile tests which the problem (1) was solved were conducted using Al–5mass%Mg alloy. They were partial solidification tensile tests (above solidus) and high temperature tensile test with high frequency induction (below solidus). Then, temperature dependence of elastic, viscoplastic properties were investigated and material constants were obtained. Furthermore, they were compared with other previous testing methods.

THE DYNAMIC BEHAVIOR OF A STEEL PIPE SHEET PILE FOUNDATION IN A LIQUEFIED LAYER DURING AN EARTHQUAKE

TRUNG Nguyen Thanh;KIYOMIYA Osamu;YOSHIDA Makoto

Journal of JSCE2(1)p.116 - 1352014年-2014年

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詳細

ISSN:2187-5103

概要: Various forms of damage to the bridge foundation structure in the revetment along riverbanks and sea coasts caused by liquefaction had been observed during past earthquakes. Several studies on liquefaction using physical model tests and numerical analysis have been conducted in recent years. However, few studies have investigated the seismic behavior of the foundation in a revetment with a slope. In strong earthquakes, the sloped ground is expected to be unstable, and lateral spreading of the ground may occur simultaneously with the loss of soil strength in the liquefaction layer. Moreover, in the seismic design specification (JRA-2002) of the bridge, the liquefaction verification of the foundation is stipulated for a flat ground but not for a sloped ground. Therefore, the effect of the lateral pressure of the liquefaction layer on the foundation in the revetment must be investigated further. This study aims to investigate the dynamic behavior of a steel pipe sheet pile (SPSP) foundation of a cable-stayed bridge and its effect on the performance of the superstructure in the revetment with a slope. A 1-G shaking table test with a scale of 1:60 was conducted on a flat model and a slope model of 15°. In addition, 2-D numerical modeling was applied in an effective stress analysis method that was used on a multi-spring model and cocktail glass model. The differences in the dynamic responses between the two models clearly illustrate the significant effect of the ground slope on the seismic behavior of the SPSP foundation and superstructure.

アルミニウム合金を中心とした凝固割れ発生のクライテリアの理論に関するレビュー (1990年代以降)

座間 淳志;吉田 誠

鋳造工学82(10)p.640 - 6462010年-2010年

CiNii

詳細

ISSN:1342-0429

Development of an Elasto-Viscoplastic Constitutive Equation for an Al-Mg Alloy Undergoing a Tensile Test during Partial Solidification

Takai Ryosuke;Matsushita Akira;Yanagida Shogo;Nakamura Koichiro;Yoshida Makoto

MATERIALS TRANSACTIONS0(0)2015年-2015年

CiNii

詳細

ISSN:1345-9678

概要:Predicting hot tearing during direct chill casting using thermal stress analysis requires constitutive equations in both semi-solid state and below the solidus of the alloy. However, numerous difficulties have been hindered constitutive equations used heretofore for hot tearing predictions. (1) Testing methods for obtaining material constants were inappropriate. First, the elastic strain reversibility was unconfirmed. Second, a flat distribution of temperature in the specimen gauge length was not guaranteed. Third, strain was measured not from local strain but from cross-head displacement. Fourth, the melt-back phenomenon was unavoidable in test during partial remelting because of homogenization of the segregation structure. (2) Temperature dependence of the strain-rate sensitivity of stress was not considered. (3) Some material constants were inferred, not obtained experimentally. This study developed elasto-viscoplastic constitutive equations (Hooke's and viscoplastic Norton-Hoff laws) for partially solidified state and below the solidus. To obtain material constants experimentally, two tensile tests for which issue (1) was addressed were conducted using Al-5 mass%Mg alloy. They were a tensile test after partial solidification and high-temperature tensile test with high-frequency induction coil. After the temperature dependence of elastic and viscoplastic properties was investigated, material constants were obtained and were compared with those obtained using earlier testing methods.

Development of an Elasto-Viscoplastic Constitutive Equation for an Al-Mg Alloy Undergoing a Tensile Test during Partial Solidification

Takai Ryosuke;Matsushita Akira;Yanagida Shogo;Nakamura Koichiro;Yoshida Makoto

MATERIALS TRANSACTIONS56(8)p.1233 - 12412015年-2015年

CiNii

詳細

ISSN:1345-9678

概要:Predicting hot tearing during direct chill casting using thermal stress analysis requires constitutive equations in both semi-solid state and below the solidus of the alloy. However, numerous difficulties have been hindered constitutive equations used heretofore for hot tearing predictions. (1) Testing methods for obtaining material constants were inappropriate. First, the elastic strain reversibility was unconfirmed. Second, a flat distribution of temperature in the specimen gauge length was not guaranteed. Third, strain was measured not from local strain but from cross-head displacement. Fourth, the melt-back phenomenon was unavoidable in test during partial remelting because of homogenization of the segregation structure. (2) Temperature dependence of the strain-rate sensitivity of stress was not considered. (3) Some material constants were inferred, not obtained experimentally. This study developed elasto-viscoplastic constitutive equations (Hooke's and viscoplastic Norton-Hoff laws) for partially solidified state and below the solidus. To obtain material constants experimentally, two tensile tests for which issue (1) was addressed were conducted using Al-5 mass%Mg alloy. They were a tensile test after partial solidification and high-temperature tensile test with high-frequency induction coil. After the temperature dependence of elastic and viscoplastic properties was investigated, material constants were obtained and were compared with those obtained using earlier testing methods.

Effect of Mn Addition on the Age-Hardening Behavior of an Al-(9–10)%Si-0.3%Mg Die Casting Alloy in T5 and T6 Heat Treatment

Fukasawa Keita;Mohri Ryousuke;Ohtake Tetsuo;Inoue Tatsuya;Kuroda Akihiro;Kambe Hiroshi;Yoshida Makoto

MATERIALS TRANSACTIONS57(6)p.959 - 9652016年-2016年

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ISSN:1345-9678

概要:This study investigated the effect of Mn adding on the T5 and T6 age-hardening behaviors of Al-(9.0–10.0)%Si-0.3%Mg (equivalent to A360 alloy) and Al-10%Si-2%Cu-0.3%Mg (equivalent to A383 alloy) die casting alloys using a hardness measurement, an electron probe micro analyzer (EPMA) and thermodynamic software. When 0.4%Mn was added, the hardness of the T5 heat-treated Al-Si-Mg die casting alloy increases because the Mn addition suppresses the formation of the π-Al8FeMg3Si6 phase during solidification and distributes Mg into the α solid solution. This mechanism named as π-phase suppression mechanism promotes precipitation strengthening. In the T6 heat treatment, the hardness of the alloys hardly increased when Mn was added. In the Al-Si-Cu-Mg alloys, the hardening by the 0.5%Mn addition was negligible compared to that of the Al-Si-Mg alloys regardless of T5 or T6 treatment. Therefore, the hardening by Mn addition is the characteristic phenomenon in the T5 heat-treated Al-Si-Mg high-pressure die casting alloy.

弾塑性クリープ構成式によるADC12合金鋳物の熱応力予測と有効性の実験的検証

志賀 英俊;佐藤 武志;神戸 洋史;本山 雄一;吉田 誠

鋳造工学 全国講演大会講演概要集168(0)p.48 - 482016年-2016年

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鋳鉄製変形評価用鋳物を用いた鋳造後冷却時の反り変形挙動の連続的取得とそのメカニズムの検討

関口 修兵;植原 健吾;本山 雄一;岡根 利光;吉田 誠

鋳造工学 全国講演大会講演概要集168(0)p.46 - 462016年-2016年

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ダイカストにおける溶湯―金型間の熱伝達係数に及ぼす油性離型剤及び粉体離型剤の影響

寺山 朗;府山 伸行;筒本 隆博;吉田 誠;志賀 英俊;神戸 洋史;岡根 利光

鋳造工学 全国講演大会講演概要集168(0)p.34 - 342016年-2016年

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Al–5mass%Mg合金の半凝固状態における粘塑性の冷却速度依存性の予測と実験的検証

広原 嶺;川田 康貴;高井 量資;大瀧 光弘;岡根 利光;吉田 誠

軽金属67(6)p.214 - 2212017年-2017年

CiNii

詳細

ISSN:0451-5994

概要:

To predict hot tearing in direct chill (DC) casting and shape casting of aluminum alloys using thermal stress analysis, cooling rate dependence of viscoplastic properties in a partially solidified state is indispensable. Based on viscoplastic properties determined from experiments, this study develops a method to predict the temperature dependence of viscoplastic properties at an arbitrary cooling rate through the Clyne–Kurz microsegregation model. For validation of the developed method, tensile tests were performed on Al–5 mass%Mg alloy in a partially solidified state at three cooling rates. Results show good agreement between the predicted values and experimentally obtained values, which demonstrates that the developed method is effective for predicting the cooling rate dependence of viscoplastic properties.

Prediction and Experimental Validation of Cooling Rate Dependence of Viscoplastic Properties in a Partially Solidified State of Al–5 mass%Mg Alloy

Hirohara Rei;Kawada Yasutaka;Takai Ryosuke;Otaki Mitsuhiro;Okane Toshimitsu;Yoshida Makoto

MATERIALS TRANSACTIONS2017年-2017年

CiNii

詳細

概要:

To predict hot tearing in direct chill (DC) casting and shape casting of aluminum alloys using thermal stress analysis, cooling rate dependence of viscoplastic properties in a partially solidified state is indispensable. Based on viscoplastic properties determined from experiments, this study develops a method to predict the temperature dependence of viscoplastic properties at an arbitrary cooling rate through the Clyne–Kurz microsegregation model. For validation of the developed method, tensile tests were performed on Al–5 mass%Mg alloy in a partially solidified state at three cooling rates. Results show good agreement between the predicted values and experimentally obtained values, which demonstrates that the developed method is effective for predicting the cooling rate dependence of viscoplastic properties.

Prediction and Experimental Validation of Cooling Rate Dependence of Viscoplastic Properties in a Partially Solidified State of Al–5 mass%Mg Alloy

Hirohara Rei;Kawada Yasutaka;Takai Ryosuke;Otaki Mitsuhiro;Okane Toshimitsu;Yoshida Makoto

MATERIALS TRANSACTIONS58(9)p.1299 - 13072017年-2017年

CiNii

詳細

概要:

To predict hot tearing in direct chill (DC) casting and shape casting of aluminum alloys using thermal stress analysis, cooling rate dependence of viscoplastic properties in a partially solidified state is indispensable. Based on viscoplastic properties determined from experiments, this study develops a method to predict the temperature dependence of viscoplastic properties at an arbitrary cooling rate through the Clyne–Kurz microsegregation model. For validation of the developed method, tensile tests were performed on Al–5 mass%Mg alloy in a partially solidified state at three cooling rates. Results show good agreement between the predicted values and experimentally obtained values, which demonstrates that the developed method is effective for predicting the cooling rate dependence of viscoplastic properties.

 

This Paper was Originally Published in Japanese in J. JILM 67 (2017) 214–221.

FEM熱応力解析による凝固割れ性予測に及ぼす鋳物の温度場と力学特性の影響

高井 量資;角田 達也;川田 康貴;広原 嶺;岡根 利光;吉田 誠

鋳造工学89(10)p.623 - 6302017年-2017年

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詳細

概要:

  It is known that hot tearing tendency increases with the increase in the cooling rate of casting during solidification. As the direct control factors of hot tearing, the cooling rate dependences of the temperature field of the casting and mechanical properties of alloys in the semi-solid state have been suggested. However, quantitative evaluation has yet to be carried out to clarify which parameters are more important for predicting hot tearing tendency.

  In this study, through thermal stress analysis using the cooling rate-dependent temperature fields of casting and cooling rate-dependent creep parameters in the semi-solid state, hot tearing tendency was predicted for an Al-Mg alloy during solidification. For the prediction, the maximum principal creep strain accumulated during the solidification was used as an indicator of hot tearing tendencies. Then, the hot tearing tendencies were compared with experimental results. As a result, in the cooling rate range of this study which corresponded to gravity die casting, it was found that temperature fields are relatively more critical for predicting hot tearing tendency than the creep parameters.

鋳型崩壊性評価の定量化に関する試み

戸羽 篤也;鈴木 逸人;稲野 浩行;平野 繁樹;兼吉 高宏;岡根 利光;吉田 誠

鋳造工学 全国講演大会講演概要集170(0)p.103 - 1032017年-2017年

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バウシンガー効果を考慮した熱応力解析によるアルミニウム合金鋳物の焼入れ時に発生する残留応力予測

内山 優太;猶木 和哉;植田 拓利;吉田 誠

鋳造工学 全国講演大会講演概要集170(0)p.11 - 112017年-2017年

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凍結凝固組織に基づく有限要素解析を用いた固液共存状態の合金の力学特性値予測

水野 裕登;天野 麻未;松下 彬;岡根 利光;吉田 誠

鋳造工学 全国講演大会講演概要集170(0)p.36 - 362017年-2017年

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Analysis of partially pulsating fatigue process on carbon steel with microstructural observation

Shimano, Hiroyuki; Faiz, M. Khairi; Hara, Asato; Yoshizumi, Kyoko; Yoshida, Makoto; Yoshida, Makoto; Horibe, Susumu

Materials Science and Engineering A651p.83 - 882016年01月-2016年01月 

DOIScopus

詳細

ISSN:09215093

概要:© 2015 Elsevier B.V.Pulsating low-cycle fatigue processes, up to the present, have been divided into three states: the transient state, steady state, and accelerating state of ratcheting. In our previous work, we suggested that fatigue behavior of pulsating fatigue process should be classified into five stages in which the plastic strain amplitude and the ratcheting strain rate are plotted on the X and Y axis, respectively. In this study, at the condition of R = -0.3 (partially pulsating fatigue), the change in the plastic strain amplitude and ratcheting strain rate for each cycle to failure was examined on AISI 1025 carbon steel. The dislocation substructure was examined using transmission electron microscopy (TEM) for each stage, except for stage I. It was also demonstrated that the fatigue process can be divided into five stages: stage I corresponds to the un-pinning of dislocations from the Cottrell atmosphere and propagation of the Luders band. Stage II corresponds to the restriction of dislocation movement by dislocation tangles. Stage III corresponds to the formation of dislocation cells. Stage IV corresponds to the promotion of the to-and-fro (back-and-forth) motion of dislocations by a re-arrangement of the dislocations in the cells. Stage V corresponds to the release of dislocation movement by the collapse of dislocation cells.

Verification of the Mechanism of Grain Refinement by Ultrasonic Treatment of Aluminum-4 Wt Pct Silicon Molten Alloy

Matsuda, Kazuki; Takehara, Tsuyoshi; Yang, Minghan; Uno, Hikaru; Kubo, Takashi; Miyano, Gaku; Yoshida, Makoto; Yoshida, Makoto

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science47(5)p.2509 - 25162016年05月-2016年05月 

DOIScopus

詳細

ISSN:10735623

概要:© 2016, The Minerals, Metals & Materials Society and ASM International.Ultrasonic treatment (UST) of molten metals produces a fine grain microstructure. Several mechanisms of grain refining by UST have been suggested; however, experimental verification has not yet established the actual mechanism. In this study, UST was applied to Al-4 wt pct Si molten alloy (1) above the liquidus temperature, (2) during undercooling before recalescence, (3) during recalescence, and (4) after recalescence. After UST treatment, the average grain sizes of the solidified samples were measured, and the effects of UST were evaluated. In the case of (1), the temperatures of the crucible, ultrasonic horn, and the atmosphere of the molten alloy were also confirmed above the liquidus temperature, and a finer grain structure was obtained. This result reveals that UST promotes the nonequilibrium nucleation mechanism. UST during (2) and (3) also caused finer grain microstructures, whereas (4) did not. UST during undercooling hastened nucleation. However, the previously reported mechanism of the breaking dendrite was not activated by UST after recalescence.

Mechanical Properties of a Partially Solidified Cu-Zn Alloy

Kasuya, Naoki; Kasuya, Naoki; Nakazawa, Tomoaki; Nakazawa, Tomoaki; Matsushita, Akira; Okane, Toshimitsu; Yoshida, Makoto; Yoshida, Makoto

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science47(4)p.1661 - 16672016年04月-2016年04月 

DOIScopus

詳細

ISSN:10735623

概要:© 2016, The Minerals, Metals & Materials Society and ASM International.For predicting solidification cracking by thermal stress analysis, the mechanical properties in the partially solidified state based on the experimental results are the best hope. However, the Young’s modulus has never been investigated for copper alloys. In this study, stress–strain curves of a Cu-Zn alloy in the partially solidified state for various solid fractions were obtained using a specially developed horizontal tensile test device. Furthermore, by removing the load during the tensile test, the spring-back (elastic behavior) was observed and the Young’s modulus was obtained.

Effect of Mn addition on the age-hardening behavior of an Al-(9-10)%Si-0.3%Mg die casting alloy in T5 and T6 heat treatment

Fukasawa, Keita; Fukasawa, Keita; Mohri, Ryousuke; Mohri, Ryousuke; Ohtake, Tetsuo; Ohtake, Tetsuo; Inoue, Tatsuya; Inoue, Tatsuya; Kuroda, Akihiro; Kambe, Hiroshi; Yoshida, Makoto

Materials Transactions57(6)p.959 - 9652016年01月-2016年01月 

DOIScopus

詳細

ISSN:13459678

概要:© 2016 Japan Foundry Engineering Society.This study investigated the effect of Mn adding on the T5 and T6 age-hardening behaviors of Al-(9.0-10.0)%Si-0.3%Mg (equivalent to A360 alloy) and Al-10%Si-2%Cu-0.3%Mg (equivalent to A383 alloy) die casting alloys using a hardness measurement, an electron probe micro analyzer (EPMA) and thermodynamic software. When 0.4%Mn was added, the hardness of the T5 heat-treated Al-Si-Mg die casting alloy increases because the Mn addition suppresses the formation of the π-Al8FeMg3Si6 phase during solidification and distributes Mg into the a solid solution. This mechanism named as π-phase suppression mechanism promotes precipitation strengthening. In the T6 heat treatment, the hardness of the alloys hardly increased when Mn was added. In the Al-Si-Cu-Mg alloys, the hardening by the 0.5%Mn addition was negligible compared to that of the Al-Si-Mg alloys regardless of T5 or T6 treatment. Therefore, the hardening by Mn addition is the characteristic phenomenon in the T5 heat-treated Al-Si-Mg high-pressure die casting alloy.

Dynamic measurements of the load on gray cast iron castings and contraction of castings during cooling in furan sand molds

Marumoto, Naoya; Kashimura, Haruki; Yoshida, Kazuki; Toyoda, Tsuneo; Okane, Toshimitsu; Yoshida, Makoto

Journal of Materials Processing Technology237p.48 - 542016年11月-2016年11月 

DOIScopus

詳細

ISSN:09240136

概要:© 2016 Elsevier B.V. All rights reserved.After JIS FC300 (almost identical to ASTM 45) gray cast iron was cast in a furan sand mold, both the load on the casting from the sand mold and contraction of the casting were measured dynamically from the beginning of solidification to 200 °C. During solidification, the cast iron casting received compressive load from the sand mold attributable to expansion of the casting. After solidification, the load on the casting and the contraction of the casting increased linearly with cooling. During A1 transformation, the load on the casting was relieved because of the casting expansion. After the A1 transformation, the load on the casting and the contraction of the casting increased linearly with cooling again. When the load on the casting reached approximately 13 kN, the load stayed constant, probably because of the sand mold fracture.

Elasto-Plastic-Creep Constitutive Equation of an Al-Si-Cu High-Pressure Die Casting Alloy for Thermal Stress Analysis

Motoyama, Yuichi; Motoyama, Yuichi; Shiga, Hidetoshi; Sato, Takeshi; Kambe, Hiroshi; Yoshida, Makoto

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science47(11)p.5598 - 56082016年11月-2016年11月 

DOIScopus

詳細

ISSN:10735623

概要:© 2016, The Minerals, Metals & Materials Society and ASM International.Accurate simulation of residual stress and deformation is necessary to optimize the design and lifetime of casting components. Therefore, the recovery and strain-rate dependence of the stress–strain curve have been incorporated into empirical constitutive equations to improve the thermal stress analysis accuracy. Nevertheless, these equations present several difficulties related to the determination of material constants and their physical bases. This study suggested an empirical elasto-plastic-creep constitutive equation incorporating these phenomena. To determine the material parameters used in this constitutive equation, this study investigated tensile test methods to obtain stress–strain curves that most closely resemble those during or immediately after casting for the Al-Si-Cu high-pressure die-casting alloy JIS ADC 12 (A383.0), which exhibits natural aging. Results show that solution heat treatment with subsequent cooling to the test temperature should be applied to obtain stress–strain curves used for the thermal stress analysis of high-pressure die casting process of this alloy. The yield stresses obtained using the conventional heating method were 50-64 pct higher than those of the method described above. Therefore, the conventional method is expected to overestimate the overestimation of the predicted residual stress in die castings. Evaluation of the developed equation revealed that it can represent alloy recovery and strain-rate dependence.

A parameterization method of recovery behavior based on initial yield stress – pre-strain diagram for an Al-Si-Cu high pressure die-casting alloy

Motoyama, Yuichi; Saito, Gota; Ono, Hiromi; Yoshida, Makoto

Materials Science and Engineering A684p.660 - 6672017年01月-2017年01月 

DOIScopus

詳細

ISSN:09215093

概要:© 2016 Elsevier B.V. Consideration of recovery behavior in the constitutive equation of alloy is crucially important for accurate thermal stress analysis of the casting process. However, previously reported empirical equations present difficulties when including a coefficient that determines the ratio of the recovery (or strain-hardening) strain component because the alloy recovery behavior has not been investigated systematically. First, this study systematically revealed effects of the temperature and amount of inelastic strain at 200–440 °C on the increase of the initial yield stress of the room temperature (RT) in an Al-Si-Cu high-pressure die casting alloy. Secondly, from those results, an initial yield stress – pre-strain diagram was proposed, demonstrating the effect of the amount of the inelastic strain given at each temperature on the increase of the initial yield stress of RT. Finally, this study newly defined a temperature-dependent contribution ratio of strain hardening to parameterize and duplicate the alloy recovery behavior based on the initial yield stress – pre-strain diagram for the constitutive equation of the alloy. Using this ratio as the coefficient to determine the proportion of the strain contributing the strain hardening for the constitutive equation, thermal stress analysis can produce more accurate duplication of the experimentally determined recovery behavior. Thereby, the residual stress and deformation of the component in the casting process can be predicted more accurately than when using conventional empirical constitutive equations.

A New Theoretical Approach Based on the Maxwell Model to Obtain Rheological Properties of Solidifying Alloys and Its Validation

Matsushita, Akira; Takai, Ryosuke; Ezaki, Hideaki; Okane, Toshimitsu; Yoshida, Makoto; Yoshida, Makoto

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science48(4)p.1701 - 17072017年04月-2017年04月 

DOIScopus

詳細

ISSN:10735623

概要:© 2017, The Minerals, Metals & Materials Society and ASM International. This paper proposes a new method for obtaining the rheological properties of solidifying alloys in the brittle temperature range (BTR). In that range, alloys show not only rheological, but also brittle behavior. Conventional methods to obtain rheological properties require steady state stress with ductility. Therefore, rheological properties of BTR alloys are unobtainable, or are otherwise including the effects of microscopic damage. The method proposed in this paper uses the stress–strain relation derived from the Maxwell model assuming that strain hardening is negligible in solid-liquid coexistence states. By removing the plastic strain term, the creep strain rate in Norton’s law is derived by the total strain rate and stress rate without the steady state stress condition. Consequently, the stress exponent n and material constant A of Norton’s law can be obtained even for alloys in the BTR. We applied this method to both tensile process before crack initiation and stress relaxation process. According to the Maxwell model, couples of the properties (n and A) obtained in both processes must be equal. Therefore, the difference can validate the obtained properties. From tensile and stress relaxation tests, we obtained the properties of solidifying Al-5 wt pct Mg alloy. We validated results by examining the difference. This report is the first to provide a method to obtain the rheological properties of BTR alloy without damage.

Low temperature and low pressure bonding of plateless Cu–Cu substrates by Ag-based transient liquid phase sintering

Muhammad, Khairi Faiz; Yamamoto, Takehiro; Yoshida, Makoto; Yoshida, Makoto

Journal of Materials Science: Materials in Electronics28(13)p.9351 - 93622017年07月-2017年07月 

DOIScopus

詳細

ISSN:09574522

概要:© 2017, Springer Science+Business Media New York. Bonding silicon carbide/gallium nitride (SiC/GaN) based power modules, particularly epoxy-molded modules to heat-substrate and/or heat sink, requires low processing temperature preferably lower than 250 °C, and low pressure as low as 0.1 MPa to prevent damage to the modules. In addition, due to the impracticality of depositing metal-plating to the epoxy-molded module, bonding of plateless Cu-substrates is in great demand. Furthermore, post-processing residual flux cleaning, which is costly and unfavorable to industry need to be avoided as possible by opting out the usage of flux. Up to authors’ knowledge, our study is the first to fulfill all requirements stated above. Transient liquid phase sintering (TLPS) of mixed fluxless Sn–Bi (tin–bismuth) eutectic alloy and Ag (silver) particles was applied to bond plateless Cu–Cu substrates. Sintering temperature of 250 °C, sintering pressure of 0.02 MPa, and reducing environment were applied during processing. The effects of addition amount of Sn–Bi and sintering holding time to the shear strength and microstructure were investigated. The remelting temperature after sintering was also examined. Shear strength of 30 wt% added Sn–Bi was over than 20 MPa, which qualify the requirement of MIL-STD-883K, and larger than conventional Pb-based solder. Formation of intermetallic compounds are thought to strengthen the interface and matrix. Remelting temperature shifted from eutectic temperature of Sn–Bi to approximately 262 °C, allowing the application of modules at higher operating temperature than the processing temperature.

Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

Motoyama, Yuichi; Shiga, Hidetoshi; Sato, Takeshi; Kambe, Hiroshi; Yoshida, Makoto

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science48(6)p.2960 - 29702017年06月-2017年06月 

DOIScopus

詳細

ISSN:10735623

概要:© 2017, The Minerals, Metals & Materials Society and ASM International. Recovery behavior (recovery) and strain-rate dependence of the stress–strain curve (strain-rate dependence) are incorporated into constitutive equations of alloys to predict residual stress and thermal stress during casting. Nevertheless, few studies have systematically investigated the effects of these metallurgical phenomena on the prediction accuracy of thermal stress in a casting. This study compares the thermal stress analysis results with in situ thermal stress measurement results of an Al-Si-Cu specimen during casting. The results underscore the importance for the alloy constitutive equation of incorporating strain-rate dependence to predict thermal stress that develops at high temperatures where the alloy shows strong strain-rate dependence of the stress–strain curve. However, the prediction accuracy of the thermal stress developed at low temperatures did not improve by considering the strain-rate dependence. Incorporating recovery into the constitutive equation improved the accuracy of the simulated thermal stress at low temperatures. Results of comparison implied that the constitutive equation should include strain-rate dependence to simulate defects that develop from thermal stress at high temperatures, such as hot tearing and hot cracking. Recovery should be incorporated into the alloy constitutive equation to predict the casting residual stress and deformation caused by the thermal stress developed mainly in the low temperature range.

Crack prediction for a partially solidified lead-free bronze casting using thermal stress analysis

Matsushita, Akira; Nakazawa, Tomoaki; Nakazawa, Tomoaki; Okane, Toshimitsu; Yoshida, Makoto; Yoshida, Makoto

Journal of Materials Processing Technology249p.46 - 562017年11月-2017年11月 

DOIScopus

詳細

ISSN:09240136

概要:© 2017 Elsevier B.V. For crack prediction in permanent mold casting of lead-free bronze, elasto-viscoplastic and elasto-plastic thermal stress analyses were performed and compared with the casting tests. The elastoviscoplastic model was constructed by the method which enables to determine rheological properties without steady state stress in experiments. Maximum deviatoric principal (only by the elastoviscoplastic analysis) and hydrostatic stress were in reasonable agreement with the locations of cold cracking and hot tearing in the casting tests, respectively. It was suggested that considering the rheological properties of semi-solid alloys was important especially to predict cracks during and after solidification

Sn-Bi added Ag-based transient liquid phase sintering for low temperature bonding

Faiz, M. Khairi; Yamamoto, Takehiro; Yoshida, Makoto; Yoshida, Makoto

Proceedings of 2017 5th International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 20172017年06月-2017年06月 

DOIScopus

詳細

概要:© 2017 JSPS 191st Committee on Innovative Interface Bonding Technology. A low temperature and low pressure fluxless bonding of plateless Cu-Cu substrates has been achieved by transient liquid phase sintering of Ag and Sn-Bi eutectic powder mixture in a formic acid reducing environment. The effects of Sn-Bi addition amount and sintering temperature to the shear strength and microstructure were investigated. Remelting temperature of the sintered paste was also examined. Shear strength of 30 weight percentage added Sn-Bi that was sintered at 250°C was over than 20 MPa. The microstructure varied with the Sn-Bi addition amount, however, mainly consisted of Ag solid solution and/or Ag-Sn intermetallic compounds (IMCs), Bi-rich phase and Cu-Sn IMCs. No remelting event at Sn-Bi eutectic temperature was observed and the remelting temperature shifted to approximately 262°C, implying the possibility for higher operation temperature although the processing was performed at lower temperature.

Low temperature Cu–Cu bonding by transient liquid phase sintering of mixed Cu nanoparticles and Sn–Bi eutectic powders

Khairi Faiz, M.; Bansho, Kazuma; Suga, Tadatomo; Miyashita, Tomoyuki; Yoshida, Makoto; Yoshida, Makoto

Journal of Materials Science: Materials in Electronics28(21)p.16433 - 164432017年11月-2017年11月 

DOIScopus

詳細

ISSN:09574522

概要:© 2017, Springer Science+Business Media, LLC. Fluxless bonding of plateless Cu–Cu substrates at processing temperature lower than 250 °C and low pressure of 0.1 MPa was achieved by transient liquid phase sintering (TLPS) of mixed Cu nanoparticles and Sn–Bi eutectic powders. The effects of mixture composition, and sintering temperature on the shear strength, microstructure, and remelting temperature were investigated. Lowering the sintering temperature of Cu mixed with 65 weight percentage of Sn–Bi (Cu–65SnBi) resulted in decreased shear strength, however, at 200 °C sintering temperature, the obtained highest shear strength was more than 20 MPa. It was found that it is essential to use Cu nanoparticles to accelerate the consumption so that no initial Sn–Bi phases remained after processing. The liquid phase generated at approximately 196 °C during sintering from the reaction between newly formed Cu 6 Sn 5 and Bi-phase was expected to facilitate the densification and strengthening of the joints. Although this newly generated liquid phase was known to solidify as hypereutectic Sn–Bi, by controlling the sintering temperature at 200 °C, the remelting event at 139 °C was not observed by differential scanning calorimetry. It is assumed that the proportion of solidified Sn–Bi eutectic phases in Cu–65SnBi that was sintered at 200 °C were significantly small, hence, when reheated at 150 °C, the obtained shear strength was equivalent to that at room temperature.

講演・口頭発表等

Low temperature, low pressure, fluxless and plateless Cu-Cu bonding by Cu nano particle transient liquid phase sintering

Yamamoto, T., Faiz, M. K., Suga, T., Miyashita, T. & Yoshida, M.

2017 IEEE CPMT Symposium Japan(IEEE)2017年11月20日

詳細

開催地:京都

Low temperature and low pressure fluxless Cu-Cu bonding by Ag-based transient liquid phase sintering for high temperature application

Khairi Faiz, M., Yamamoto, T. & Yoshida, M.

2017 IEEE CPMT Symposium Japan(IEEE)2017年11月20日

詳細

開催地:京都

Sn-Bi added Ag-based transient liquid phase sintering for low temperature bonding

Faiz, M. K., Yamamoto, T. & Yoshida, M.

Proceedings of 2017 5th International Workshop on Low Temperature Bonding for 3D Integration(IEEE)2017年05月16日

詳細

開催地:東京

Dynamic measurements of the load on GCI castings and the contraction of castings during cooling in green sand molds

Yoshida, K., Kashimura, H., Ueno, S., Makino, H. & Yoshida, M.

2016 72nd World Foundry Congress(The WFO)2016年05月21日

詳細

開催地:名古屋

Numerical value evaluation of graphite morphology and mechanical property of flake graphite cast iron

Hiratsuka, S., Ichimura, H. & Yoshida, M.

2016 72nd World Foundry Congress(The WFO)2016年05月21日

詳細

開催地:名古屋

Prediction of hot tearing for a partially solidified bismuth bronze by using finite element method analysis

Matsushita, A., Nakazawa, T., Okane, T. & Yoshida, M.

2016 72nd World Foundry Congress(The WFO)2016年05月21日

詳細

開催地:名古屋

Prediction of residual stress in grey cast iron: Experiment and analysis

Motoyama, Y., Takahashi, H., Okane, T., Fukuda, Y. & Yoshida, M.

Materials Science and Technology Conference and Exhibition 20132013年10月27日

詳細

開催地:モントリオール

Compressive deformation of MWCNT porous preform during infiltration of aluminum or magnesium alloy

Uozumi, H., Kobayashi, K., Nakanishi, K., Matsunaga, T., Sakamoto, H., Mekuchi, Y., Kuno, M., Tsukada, T., Shinozaki, K., Masuda, C. & Yoshida, M.

16th International Conference on Composite Materials(ICCM)2007年07月08日

詳細

開催地:京都

Wettability of basal and prismatic plane of graphite by molten aluminum - Magnesium alloy

Yoshida, M., Matsunaga, T., Ogata, K., Hatayama, T. & Shinozaki, K.

5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'20062006年07月04日

詳細

開催地:バンクーバー

Wettability of carbon fiber and aluminum borate whisker hybrid preform by molten magnesium

Uozumi, H., Kobayashi, K., Nakanishi, K., Shinozaki, K., Masuda, C. & Yoshida, M.

SAMPE '07: M and P - From Coast to Coast and Around the World2007年06月03日

詳細

開催地:ボルチモア

Fabrication of carbon fiber reinforced aluminum magnesium alloy composite wires using ultrasonic infiltration method

Matsunaga, T., Ogata, K., Hatayama, T., Shinozaki, K. & Yoshida, M.

2006 TMS Annual Meeting2006年03月12日

詳細

開催地:サンアントニオ

Fabrication and mechanical properties of the SiC fiber reinforced oxide matrix composites

Yoshida, M., Nagahisa, K., Kitatani, K., Ohta, N., Ishikawa, T., Pan, J., Sasaki, G. & Fukunaga, H.

Proceedings of the Second International Conference on Processing Materials for Properties2000年11月05日

詳細

開催地:サンフランシスコ

Influence of gravity on monotectic and eutectic growth

Aoi, I., Yoshida, M., Ishino, M. & Nakae, H.

Proceedings of the Second International Conference on Processing Materials for Properties 2000年11月05日

詳細

開催地:サンフランシスコ

特許

整理番号:1181

低温金型・低圧鋳造法(日本)

吉田 誠

特願2011-040436、特開2012-176424、特許第5704641号

整理番号:1288

複合型の構造物を用いた鋳造法(日本)

吉田 誠

特願2012- 13109、特開2013-151006、特許第5818211号

整理番号:1306

アルミニウム鋳造品の製造方法及びアルミニウム鋳造品(日本)

吉田 誠

特願2012-072425、特開2013-202636

整理番号:1437

熱変形解析方法、熱変形解析プログラム、および熱変形解析装置(日本)

吉田 誠, 本山 雄一

特願2014-004578、特開2015-132564、特許第6268584号

整理番号:1673

鋳造欠陥を定量化するための測定装置、方法、コンピュータプログラムおよびコンピュータ読み取り可能な記録媒体(日本)

吉田 誠, 深澤 恵太, 柴田 悠矢

特願2015- 55068、特開2016-175088、特許第5943402号

整理番号:2034

ダイカスト金型、当該ダイカスト金型で製造されたダイカスト品およびダイカスト品の製造方法(日本)

吉田 誠

特願2018-073921、特開2019-181503

整理番号:2079

加熱炉及び加熱炉内におけるワーク温度取得方法(日本)

吉田 誠, 勝田 正文, 早乙女 康典

特願2018-104697、特開2019-209338

整理番号:2080

加熱炉及び加熱炉内におけるワーク温度取得方法(日本)

吉田 誠, 勝田 正文, 早乙女 康典

特願2018-104696、特開2019-209337

整理番号:2081

温度計測システム、加熱炉及び加熱炉内におけるワーク温度取得方法(日本)

吉田 誠, 勝田 正文, 早乙女 康典

特願2018-104708、特開2019-211227

整理番号:2092

複合体およびその製造方法(日本)

吉田 誠

特願2018-136527、特開2020- 11278

外部研究資金

科学研究費採択状況

研究種別:

カーボン系短繊維強化アルミ基複合材料の製造と界面組織解析

配分額:¥4160000

研究種別:

晶出相間に比重差を有する多相凝固のカップルドグロースに及ぼす重力の影響

配分額:¥2200000

研究種別:

高効率コンバインド発電システム用SiC繊維強化酸化物マトリックス動翼材の開発研究

配分額:¥13500000

研究種別:

一方向凝固偏晶・共晶合金の協調成長および偏析挙動に及ぼす重力の影響

配分額:¥2200000

研究種別:

金属基複合材料の微視的変形、破壊挙動の解析

配分額:¥3600000

研究種別:

一方向凝固法によるAl_2O_3-Y_2O_3系共晶酸化物/炭化物系強化繊維の複合化

配分額:¥2200000

研究種別:

3Dプリンタを用いた三相界面の微細構造作製による固体電解質形燃料電池の性能向上

2016年-0月-2017年-0月

配分額:¥3640000

研究資金の受入れ状況

2005- 産学連携(木村鋳造所)大型鋳鉄鋳物の熱応力・変形の予測と制御2005年-
-2004 産学連携(リョービ)非熱処理型アルミダイカストの凝固割れに関する研究2003年-
2003-2005 広島県産業科学技術研究所、マツダ、リョービ等 耐熱マグネシウムの半凝固成形に関する研究開発2003年-2005年
2006- 産学連携(ヤマハ発動機) 固液共存領域の力学物性に関する研究2006年-
2004-2006 NEDO 炭素系繊維強化マグネシウム合金複合材料の作製、日産自動車、カーボンナノテクノロジーズ社2004年-2006年

実施形態:受託教育

1996.4-1999.3中小企業事業団中小企業創造基盤技術研究事業 (出資金による受託)「チクソキャストによるハイブリット複合材料部材の開発」 広大、広島西部工技センター、広島アルミ、マイクロテクノ1996年-1999年

実施形態:受託教育

1997.4-2000.3 財団法人宇宙フォーラム地上公募実験(受託) 偏晶・共晶合金の凝固成長および偏析挙動に及ぼす重力の影響 広大、早稲田大学1997年-2000年

実施形態:受託教育

1998-2001.3  NEDO 地域コンソーシアム「粉体離型潤滑剤を用いた素形材加工エコシステムの研究開発」 広大、広島西部工技センター、岡山工技センター、広島アルミ、光軽金属、福山技研、花野商事1998年-2001年

実施形態:共同研究

2000-2002.32001年-2002年

実施形態:受託教育

2002-2003.3 NEDO産業技術研究助成事業(出資金による受託) 「高発電効率型・小型コジェネレーション発電・廃熱利用システム用/高耐熱・低慣 性複合材料の開発研究」広大、宇部興産、東洋炭素2002年-2003年

実施形態:受託教育

2002- 経済産業省地域コンソーシアム(出資金による受託) 半凝固射出成形法による循環型・軽量高品質自動車部品の研究開発 広大、産総研中国センター、岡山工技、マツダ、広島アルミ、朝日アルミ、リョービ2002年-

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機械材料の力学物性創造理工学部2020春学期
Industrial Materials (Japanese)創造理工学部2020春学期
インダストリアルマテリアルズ創造理工学部2020春学期
Materials Processing (Japanese)創造理工学部2020集中講義(秋学期)
輸送機器材料創造理工学部2020集中講義(秋学期)
Graduation Thesis A創造理工学部2020秋学期
Graduation Thesis A 【S Grade】創造理工学部2020秋学期
Graduation Thesis B創造理工学部2020春学期
Graduation Thesis B [S Grade]創造理工学部2020春学期
Materials Science and Engineering for Space Craft創造理工学部2020春学期
Mechanical Engineering Laboratory A創造理工学部2020春学期
Mechanical Engineering Laboratory B創造理工学部2020秋学期
Seminar C創造理工学部2020春学期
Engineering Practice C創造理工学部2020春学期
Seminar A創造理工学部2020春学期
Seminar A創造理工学部2020春学期
Engineering Practice A創造理工学部2020春学期
Engineering Practice A創造理工学部2020春学期
Seminar B創造理工学部2020秋学期
Seminar B創造理工学部2020秋学期
Engineering Practice B創造理工学部2020秋学期
Engineering Practice B創造理工学部2020秋学期
実体情報学概論大学院基幹理工学研究科2020春学期
実体情報学概論大学院創造理工学研究科2020春学期
実体情報学概論大学院先進理工学研究科2020春学期
修士論文(総合機械)大学院創造理工学研究科2020通年
輸送機器・エネルギー材料工学研究大学院創造理工学研究科2020通年
Research on Transporters & Energy Plants Materials Science and Engineering大学院創造理工学研究科2020通年
輸送機械生産加工学研究大学院創造理工学研究科2020通年
輸送機器・エネルギー材料工学特論大学院創造理工学研究科2020春学期
デザイン・共創実習A大学院創造理工学研究科2020春学期
デザイン・共創実習B大学院創造理工学研究科2020秋学期
構造材料生産技術大学院基幹理工学研究科2020集中講義(春学期)
構造材料生産技術大学院創造理工学研究科2020集中講義(春学期)
構造材料生産技術大学院創造理工学研究科2020集中講義(春学期)
構造材料生産技術大学院先進理工学研究科2020集中講義(春学期)
マテリアルファンダメンタルズ大学院創造理工学研究科2020秋学期
マテリアルズエンジニアリング大学院創造理工学研究科2020秋学期
機械材料の力学物性大学院創造理工学研究科2020春学期
輸送機器材料大学院創造理工学研究科2020集中講義(秋学期)
インダストリアルマテリアルズ大学院創造理工学研究科2020春学期
Materials Science and Engineering for Space Craft大学院創造理工学研究科2020春学期
宇宙材料学大学院創造理工学研究科2020春学期
Seminar on Transporters & Energy Plants Materials A大学院創造理工学研究科2020春学期
輸送機器・エネルギー材料工学演習A大学院創造理工学研究科2020春学期
Seminar on Transporters & Energy Plants Materials B大学院創造理工学研究科2020秋学期
輸送機器・エネルギー材料工学演習B大学院創造理工学研究科2020秋学期
Seminar on Transporters & Energy Plants Materials C大学院創造理工学研究科2020春学期
輸送機器・エネルギー材料工学演習C大学院創造理工学研究科2020春学期
Seminar on Transporters & Energy Plants Materials D大学院創造理工学研究科2020秋学期
輸送機器・エネルギー材料工学演習D大学院創造理工学研究科2020秋学期
Master's Thesis (Department of Modern Mechanical Engineering)大学院創造理工学研究科2020通年
輸送機器・エネルギー材料工学研究大学院創造理工学研究科2020通年
輸送機械生産加工学研究大学院創造理工学研究科2020通年