大見 敏仁 准教授

[研究テーマ]
水素でモノが壊れる理由や条件の解明

[主な担当科目]
機械設計法、材料力学1

[取得学位]
博士（工学）

専門・研究分野

材料強度学

研究テーマ

水素でモノが壊れる理由や条件の解明
安全な機械の設計には、機械の壊れ方と壊れる理由を知る必要があります。ところが壊れ方は複雑で、環境（温度や湿度など）が変わると壊れる理由も変わります。水素もその一つで、水素があると鉄が壊れやすくなります。安全な水素エネルギー社会のため、水素でモノが壊れる理由や条件を予測します。

研究キーワード

水素脆化、金属疲労、動脈硬化診断装置

SDGsとの関連

主な研究業績

＜論文＞

A. Toshimitsu Yokobori,Jr., Yoru Wada, Tadao Iwadate, Kunihiro Yamada, Toshihito Ohmi, “The Effect of Hydrogen Diffusion Behavior on the Embrittlement of Steel under Hydrogen Atmospheric Condition”, Proc. of ICF11, Turin (Italy), March 20-25 (2005) in the contents of corrosion, CD-ROM.
横堀壽光，櫛田隆弘，大見敏仁, “解析解による溶接HAZ部の応力誘起水素拡散挙動解析と水素感受性評価”, 日本金属学会誌, 70(2006), 489-494.
和田洋流, 田中恭彦, 岩館忠雄, 大見敏仁, 横堀壽光, “水素を吸蔵した2.25Cr-1Mo厚肉圧力容器鋼の水素脆化割れ進展挙動におよぼす試験片サイズの影響”, 日本金属学会誌, 71(2007), 772-780.
T. Ohmi, A. T. Yokobori, Jr., K. Takei, “The Effect of Mechanical Factors on Hydrogen Diffusion and Concentration around a Crack Tip”, Proc. of ICF12, Ottawa (Canada), July 12-17, (2009) CD-ROM.
A.Toshimitsu Yokobori,Jr., Toshihito Ohmi, Takenao Nemoto and Tomoharu Uesugi, “Proposal of α Multiplication Method on the Numerical Analysis of the Equation fo Particle Diffusion Driven by Potential Gradient”, Journal of the Japanese Society for Strength and Fracture of Materials, 43-3-4(2009), 53-59.
A. T. Yokobori Jr., R. Sugiura, T. Ohmi, V. A. Yardley, T. Matsuzaki, “Fractal and Scale Effect on the Morphology of Sub-critical Creep Crack Growth Path”, Proc. of ICF, Ottawa (Canada),July 12-17,(2009) CD-ROM.
A. Toshimitsu Yokobori Jr. Tatsuya Nishimoto, Toshihito Ohmi, Yoshinori Miyasaka, “The effect of mechanical stimulation on osteogenesis process based on stress induced particle diffusion analysis”, The Japanese Bio-Electrical and Physical Stimulation Research Society, 24(2010), 23-30.
Toshihito Ohmi, A. Toshimitsu Yokobori, Jr. and Shinya Taketomi, “The Proposal of the Mechanical Control Method of Hydrogen Diffusion and the Test Method of Hydrogen Embrittlement Sensitivity using a Small Specimen Based on This Method”, Journal of the Japanese Society for Strength and Fracture of Materials, 44-4(2010), 59-69.
T. Ohmi, A. T. Yokobori,Jr., “Hydrogen Concentration Behavior around a Crack Tip under the Constant Wind Rate Condition Simulated to a Moving Crack with Constant Rate”, Strength, Fracture and Complexity, 6(2010), 69-82.
T. Yokobori, Jr., Y. Abe, H. Tsukidate, T. Ohmi and R. Sugiura, H. Ishikawa, “Micro mechanics based on vacancy diffusion coupled with damage mechanics related to creep deformation and prediction of creep fracture life”, Materials at High Temperatures, 28-2(2011), 126-136.
A. Toshimitsu Yokobori Jr, Toshihito Ohmi, Tsutomu Murakawa, Takenao Nemoto, Tomoharu Uesugi and Ryuji Sugiura, “The application of the analysis of potential driven particle diffusion to the strength of materials”, Strength, Fracture and Complexity, An International Journal, 7-2(2011), 215-233.
Osamu Takakuwa, Toshihito Ohmi, Masaaki Nishikawa, A. Toshimitsu Yokobori Jr. and Hitoshi Soyama, “Suppression of Fatigue Crack Propagation with Hydrogen Embrittlement in Stainless Steel by Cavitation Peening”, Strength, Fracture and Complexity, An International Journal, 7-1 (2011) 79–85
A. Toshimitsu Jr., Tatsuya Nishimoto, Toshihito Ohmi, Yoshinori Miyasaka, “The build up analysis of the diffusion behavior of osteogenesis ion in bone due to the mechanical and electrical stimulation”, The Japanese Bio-Electrical and Physical Stimulation Research Society 26(2012), 9-19.
Ryuji Sugiura, A. Toshimitsu Yokobori, Jr., Toshihito Ohmi, Yoshiko Nagumo, Takashi Matsuzaki,　Victoria A.Yardley, “Scale effect of material structure on the similarity of subcritical crack growth under sustained loading”, Strength, Fracture and Complexity, An International Journal, 7-3(2012), 321-332.
Toshihito Ohmi, Daisuke Kobayashi, Takashi Matsuzaki, Yoshiko Nagumo, Ryuji Sugiura and A.Toshimitsu Yokobori,Jr., “Simulation of Crystal Misorientation based on Local Micro Strain Analysis of Heat-Resistant Steel under Creep Condition”, Journal of the Japanese Society for Strength and Fracture of Materials, 46-1(2012), 1-6.
Toshihito Ohmi, A.Toshimitsu Yokobori, Jr. and Kenichi Takei, “Flow Controllability of Hydrogen Diffusion Driven by Local Stress Field for Steel under Cyclic Loading Condition”, Defect and Diffusion Forum, 326-328(2012), 626-631.
Haruhisa Sigeyama, A. Toshimitsu Yokobori, Jr., Toshihito Ohmi and Takenao Nemoto, “Analysis of Stress Induced Voiding Using by Finite Element Analysis Coupled with Finite Difference Analysis”, Defect and Diffusion Forum, 326-328(2012), 632-640.
A.Toshimitsu Yokobori,Jr., Toshihito Ohmi, Ryouhei Monma, Yuki Tomono, Kyousuke Inoue, Michiaki Owa, Masataka Ichiki, Noriko Mochizuki and Hidetoshi Yamashita, “Correlation between the characteristics of Accelaeration and Visco elasticity of artery wall under Pulsatile Flow conditions (Physical Meaning of I＊ as a Parameter of Progressive Behaviors of Atherosclerosis and Arteriosclerosis)”, Bio-Medical Materials and Engineering, 23(2013), 75-91.
Toshihito Ohmi, A.Toshimitsu Yokobori,Jr., Ryuuji Sugiura, Takashi Matsuzaki, “The FEM Analysis of Creep Damage Development Considering the Anisotropy of Crystal Grain”, Proceedings of ECCC Creep & Fracture 2014, (2014)
Mikihito Ishikawa, A.Toshimitsu Yokobori, Jr., Yusuke Kawashima, Toshihito Ohmi and Seiji Sugawara, “The Quantitative Estimation of the Sensitivity of Corrosion and Hydrogen Environment on Fatigue Crack Grosth Rate for Steels”, Proceedings of the ASME 2014 Pressure Vessels & Piping Division Conference, (2014)
Toshihito Ohmi, Toshimitsu Yokobori, Kenichi Takei and Yuki Konishi, “The Analysis of Hydrogen Diffusion Behaviors Coupled with the Analysis of Heat Transfer around the Heat Affected Zone of Welding”, Proceedings of the ASEM 2014 Pressure Vessels & Piping Fonference,(2014)
A.Toshimitsu Yokobori, Jr., Yoshiko Nagumo, Takahiro Yajima and Toshihito Ohmi, “The characterization of dominating region of fracture (process region) around a crack tip based on the concept of mechanical similarity and atomic mechanics”, Strength, Fracture and Complexity, 8(2014), 93-103
A.Toshimitsu Yokobori, Jr. and Toshihito Ohmi, “The significance of α multiplication method for numerical analysis of potential induced particle diffusion”, Strength, Fracture and Complexity, 8(2014), 117-124
A.Ando, A.Toshimitsu Yokobori, R.Sugiura, T.Ohmi, G.Ozeki and T.Matsubara, “Non-destructive prediction method of creep damage and remnant life related to those under creep-fatigue interactive conditions for nickel base superalloys”, Proceedings of the Creep-Fatigue Crack Development Symposium, (2014)
A. Toshimitsu Yokobori, Jr., Ryuji Sugiura, Toshihito Ohmi and Robert A. Ainsworth, “A review of a time-dependent fracture life law (or model) based on a proposed multi-scale analysis”, Strength, Fracture and Complexity, 8(2014), 205-218
Y.Yanagisawa, W.Yoru, T.Ohmi and A.T.Yokobori Jr., “Hydrogen-Assisted Cracking Threshold of High-Strength Low-Alloy Steel”, Proceedings of the ASME 2015 Pressure Vessels and Piping Conference,(2015)
N.Ishikawa, A.T.Yokobori Jr., T.Ohmi, “Hydrogen Diffusion Analysis in the Fatigue Crack Growth Test under High Pressure Hydrogen”, Proceedings of the ASME 2015 Pressure Vessels and Piping Conference,(2015)
A.Ando, A.Toshimitsu Yokobori, R.Sugiura, T.Ohmi, G.Ozeki and T.Matsubara, “Non-destructive prediction method of creep damage and remnant life related to those under creep-fatigue interactive conditions for nickel base superalloys”, Materials at High Temperatures,32(3),(2015),266-275

＜国際会議論文＞

T. Ohmi, A. T. Yokobori, Jr., K. Takei, “The Effect of Mechanical Factors on Hydrogen Diffusion and Concentration around a Crack Tip”, International Conference on Fracture ICF12, July 12-17,(2009), Ottawa (Canada).
Toshihito Ohmi and A. Toshimitsu Yokobori, Jr., “The proposal of the mechanical control method of hydrogen diffusion and the test method of hydrogen embrittlement sensitivity using a small specimen based on this method”, International Conference on Fracture and Strength - From Physical to Holistic -, Oct. 4-6 (2010), Sendai (Japan)
Toshihito Ohmi, A. Toshimitsu Yokobori, Jr. and Kenichi Takei, “Flow Controllability of Hydrogen Diffusion Driven by Local Stress Field for Steel under Cyclic Loading Condition”, 7th International Conference on Diffusion in Solids and Liquids - DSL-2011, Jun. 27 – 29 (2011), Algarve (Portugal).
T. Ohmi, T. Odake, K. Sanada and A. T. Yokobori, Jr., “The behavior of corrosion fatigue crack growth for Electromagnetic-Stainless steels in 3.5% NaCl solution and hydrogen diffusion mechanism”, Asian Pacific Conference on Fracture and Strength-Mechanics and Materials, May 13 - 16 (2012), 釜山 (Korea)
Toshihito OHMI, Toshimitsu YOKOBORI, Yuusuke KAWASHIMA and Masaaki NISHIKAWA, “Numerical Analysis of Stress induced Particle Diffusion Based on the FEM - FDM Coupled Method - Hydrogen diffusion -”, JSME-CMD International Computational Mechanics Symposium 2012, Oct. 9 – 11(2012), Kobe (Japan).
Toshihito Ohmi, “The FEM analysis of creep damage development considering the anisotropy of crystal grain”, ECCC2014 3rd International ECCC Conference, May 5-7(2014), Rome (ITALY)
Toshihito Ohmi, “The Analysis of Hydrogen Diffusion Behaviors Coupled with the Analysis of Heat Transfer around the Heat Affected Zone of Welding”, ASEM 2014 Pressure Vessels & Piping conference, July. 20-24 (2014) Anaheim (USA)

＜著書（分担執筆：担当部分）＞

横堀壽光, 西本達也, 大見敏仁, 宮坂芳典, “基礎Ⅰ 生体電気・物理刺激の物理現象 3 生体力学刺激の物理現象”, 生体電気・物理刺激による骨・軟部組織修復法, 株式会社金芳堂, (2012), 67-75, 日本生体電気・物理刺激研究会.
A. Toshimitsu Yokobori,Jr. Toshihito Ohmi, Ryuji Sugiura, “Chapter 2 Mechanical Aided small specimen test method under cyclic loading based on mechanically hydrogen locking mechanism” and “Chapter 3 Estimation method and results under cyclic loading　in Corrosive Environment”, Innovative Testing and Estimation Methods of Hydrogen Embrittlement Under Sustained, Rising and Cyclic Loading, (2012), 37-72, Japan Society for the Promotion of Science, 129th Committee on Strength and Fracture of Advanced Materials.