研究者データベース

加藤 博之(カトウ ヒロユキ)
工学研究院 機械・宇宙航空工学部門 機械材料システム
准教授

基本情報

所属

  • 工学研究院 機械・宇宙航空工学部門 機械材料システム

職名

  • 准教授

学位

  • 工学修士(京都大学)
  • 工学博士(京都大学)

J-Global ID

プロフィール

  • 1996-97 KU Leuven, Belgium

    1998-2001 Univ. Washington, Seattle USA

研究キーワード

  • 構造・機能材料   塑性変形・破壊   連続体力学   function material   structure   fracture   plastic deformation   continuum mechanics   

研究分野

  • ナノテク・材料 / 構造材料、機能材料
  • ナノテク・材料 / 金属材料物性
  • ものづくり技術(機械・電気電子・化学工学) / 材料力学、機械材料

職歴

  • 1991年 - 2001年 京都大学工学研究科 助手
  • 1991年 - 2001年 Graduate School of Engineering Kyoto-U. research associate.
  • 2001年 - 北海道大学工学研究科 助教授
  • 2001年 - Graduate School of Engineering, Hokkaido-U. Associate Professor.

学歴

  •         - 1989年03月   京都大学   工学研究科   物理工学科
  •         - 1989年   京都大学
  •         - 1987年03月   京都大学   工学部   機械工学科
  •         - 1987年   京都大学

所属学協会

  • 日本機械学会   日本金属学会   日本材料学会   

研究活動情報

論文

  • Shape Memory Effect and Superelasticity of Textured NiTi Alloy Wires
    加藤博之, 福島峻, 佐々木一彰
    Advances in Shape Memory Materials 2017年05月 [査読有り][招待有り]
  • Hiroyuki Kato, Kazuaki Sasaki, T. Mori
    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 642 150 - 156 2015年08月 [査読有り][通常論文]
     
    The Bauschinger effect in a 1 mm thick sheet of interstitial free (IF) steel was examined by tensile testing (prestraining) and subsequent four-point bending. The effect was absent when the prestrain was below 4% and was present when the prestrain was above 4%. The Bauschinger effect parameter determined the elastic back stress which developed after prestraining. The occurrence of back stress coincided with the development of dislocation cell structures, observed with transmission electron microscopy. (C) 2015 Elsevier B.V. All rights reserved.
  • 細矢隆史, 加藤博之, 佐々木一彰
    日本機械学会論文集 81 830 2015年 [査読有り][通常論文]
  • Four-point bending test of determining stress-strain curves asymmetric between tension and compression
    加藤博之, 鳥取豊, 佐々木一彰
    Experimental Mechanics 54 7 1715 - 1718 2014年05月 [査読有り][通常論文]
  • Hiroyuki Kato, Richard Moat, Tsutomu Mori, Kazuaki Sasaki, Philip Withers
    ISIJ INTERNATIONAL 54 7 1715 - 1718 2014年 [査読有り][通常論文]
     
    Martensite formed in TRIP steels causes large work hardening. The expectation that this is due to the back stresses induced into the ferrite by the hard martensite was examined by the Bauschinger effect after room temperature tensile straining of a TRIP steel into which the martensite had been introduced by prior straining at -50 degrees C. Bending tests were employed to detect the Bauschinger effect. The tests showed that the compressive flow stress became much smaller than the tensile flow stress and confirmed the expectation.
  • 細矢隆史, 加藤博之, 佐々木一彰
    日本機械学会論文集 80 819 2014年 [査読有り][通常論文]
  • 安田洋平, 加藤博之, 佐々木一彰
    材料 62 779 - 785 2013年12月 [査読有り][通常論文]
  • 加藤博之, 佐々木一彰
    International Journal of Plasticity 50 37 - 48 2013年 [査読有り][通常論文]
  • Hiroyuki Kato, Yohei Yasuda, Kazuaki Sasaki
    ACTA MATERIALIA 59 10 3955 - 3964 2011年06月 [査読有り][通常論文]
     
    When a martensitic shape memory alloy is deformed, the reverse transformation occurs at higher temperature than that of undeformed martensite. This is a typical case of the stabilization effect of martensite that is commonly observed in shape memory alloys. Regarding previous results measured by electric resistance and/or dilatometoric methods in NiTi and CuAlNi shape memory alloys, this study has performed calorimetric measurement in these alloys in order to re-examine the stabilization effect in terms of thermodynamics. Experimental evidence for appreciable changes in the reverse transformation temperature due to variant change of the martensite is presented. The elastic energy stored in the deformed martensite and the irreversible energy dissipated during the reverse transformation are estimated from the transformation temperatures, the stress-strain curves of the martensite and the latent heat of transformation. The temperatures of the reverse martensitic transformation have been related to these energies in explicit form. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
  • Tokujiro Yamamoto, Hiroyuki Kato, Yoshihiro Murakami, Hisamichi Kimura
    Acta Materialia 56 20 5927 - 5937 2008年12月 [査読有り][通常論文]
     
    Martensitic transformation was investigated for Ti-rich Ti-Ni gas-atomized powders as a function of powder size. The large powders clearly exhibit multiple martensitic transformations on both cooling from austenite to martensite and vice versa. With increasing powder size, the minor martensitic transformation temperatures increase and the amount of heat accompanying the minor transformation also increases. However, the main martensitic transformation temperature is almost the same, irrespective of the powder size. Microstructures of the as-atomized powders were examined to clarify why the powders exhibit the multiple martensitic transformations. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
  • H Kato, N Inagaki, K Sasaki
    ACTA MATERIALIA 52 11 3375 - 3382 2004年06月 [査読有り][通常論文]
     
    Stress is built up in a shape memory alloy if the strain recovery due to shape memory effect is blocked. This study provides a one-dimensional model for the analysis of the constrained shape memory effect. The model describes how the stress stabilizes a martensile at a temperature above the Af temperature. The condition for the martensite and austenite to reach equilibrium at that temperature has been obtained in terms of the balance between the elastic strain energy and the chemical (Helmholtz) free energy of the two phases. The stress values predicted from the model have been compared with the experimental results of a nickel-titanium shape memory alloy. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
  • 品川晃徳, 佐々木一彰, 加藤博之
    日本金属学会誌 68 3 191 - 197 2004年03月 [査読有り][通常論文]
  • A Steuwer, T Mori, H Kato, T Wada
    JOURNAL OF APPLIED PHYSICS 94 4 2761 - 2763 2003年08月 [査読有り][通常論文]
     
    Using energetics, we examine the occurrence of large strains, so-called giant magnetostriction, in ferromagnetic shape memory alloys by the application of an external magnetic field. It is claimed that these strains originate from the conversion of one martensite variant to another. In this article, we attempt to show that magnetic work cannot supply the work required for the conversion of martensite variants in most cases. It is also pointed out that the latter work dissipates, while most of the magnetic work is conserved, as indicated by almost hysteresis-free magnetization curves. Therefore, simple energy conservation arguments rule out the suggested variant conversion mechanism not only quantitatively, but also qualitatively. A possible explanation for the occurrence of large strains is offered. (C) 2003 American Institute of Physics.
  • H Kato, YC Liang, M Taya
    SCRIPTA MATERIALIA 46 6 471 - 475 2002年03月 [査読有り][通常論文]
     
    We report stress-induced martensitic transformation in tensile loaded Fe-30.5 at.% Pd polycrystals, mainly using optical microscopy. Reverse transformation occurs during unloading. Thermodynamic relationships between applied stress, transformation strain and the latent heat of transformation are examined. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
  • YC Liang, H Kato, M Taya, T Mori
    SCRIPTA MATERIALIA 43 6 535 - 540 2000年08月 [査読有り][通常論文]
  • Cyclic stress-strain response of superelastic Cu-Al-Mn alloy single crystals
    H Kato, T Ozu, S Hashimoto, S Miura
    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 264 1-2 245 - 253 1999年05月 [査読有り][通常論文]
     
    Stress-strain response of cyclic superelastic deformation was examined in Cu-20at.%Al-10at.%Mn shape memory alloy single crystals. As the superelastic deformation was repeated, the critical stress for the onset of stress-induced transformation decreased at an almost constant rate to zero by a finite number of cycles N-c. By further cycles residual martensite was accumulated until all the stress-induced martensite was left after unloading. The decrease of the stress per cycle and the number N-c depended on the direction of applied stress, i.e. tension, compression and tension-compression, and also the crystal orientation. These N-c's can be related by a linear S-N curve; log N-c decreased linearly with increasing log Delta sigma, where Delta sigma is the hysteresis-width in superelastic stress-strain curve. The observed fatigue behaviour can be understood in terms of internal stress of dislocation substructure formed during the cycles. (C) 1999 Elsevier Science S.A. All rights reserved.
  • H Kato, T Yamamoto, S Hashimoto, S Miura
    MATERIALS TRANSACTIONS JIM 40 4 343 - 350 1999年04月 [査読有り][通常論文]
     
    Plastic behaviour of the beta nickel-titanium alloys with nearly-equiatomic compositions, Ti-49.5, 50.0 and 50.5 mol%Ni, has been studied. The alloys were highly ductile due to dislocation glide at temperatures where the beta-phase was in equilibrium. The ductility became largest at the lowest temperature in the stability range of the beta-phase. The strain-rate vs. flow stress relations of easy-glide deformation in tensile testing and steady-state creep deformation satisfied the power law. Both of the deformations are associated with the dislocation glide which are likely to be controlled by the Peierls mechanism. A yield drop at the onset of plastic flow appeared only in the tensile deformation of Ti-50.5 mol%Ni, but not in Ti-49.5 and 50.0 mol%Ni alloys. Excess nickel atoms would exist as antistructure defects, which might be responsible for the yield point phenomena.
  • H Kato, R Stalmans, J Van Humbeeck
    MATERIALS TRANSACTIONS JIM 39 3 378 - 386 1998年03月 [査読有り][通常論文]
     
    The two-way shape memory effect in CuAlNi shape memory alloy single crystals was studied. The effect was induced by cyclic tensile deformations of superelasticity and shape memory effect, and the efficiency of both methods was examined. Compared with the similar training process in the single crystals of CuZnAl alloys, the CuAlNi alloy showed much smaller changes in stress-strain behaviour and in the resulted two-way memory strain. The superelasticity training had no influence on both the stress-strain behaviour and the dilatation change. By shape memory training, the two-way memory strain increased to saturate at 0.90% after 10 cycles. Associated with this change, particular martensite variants increased its fraction and became "reproductive". However, they were not the variants that were induced during the training, and further increase in the two-way memory strain was impossible by the formation of the observed variants. It was concluded that the present training methods were not effective for the two-way memory effect in CuAlNi shape memory alloy.
  • J Dutkiewicz, H Kato, S Miura, U Messerschmidt, M Bartsch
    ACTA MATERIALIA 44 11 4597 - 4609 1996年11月 [査読有り][通常論文]
     
    Structure changes during pseudoelastic deformation of CuAlMn single crystals were investigated using in situ optical and high-voltage electron microscopy (HVEM). Several crystal orientations were investigated, from an irrational to [100] and [110] tensile axis and plane orientations in the case of thin foils. The composition of the alloy was chosen such as to obtain superelastic behavior at room temperature. Optical microstructures allowed to identify parallel plates at the beginning of the stress plateau, the number of which increased with strain. The stress/temperature phase diagram was established within the range of existence of gamma'(1) and beta'(1). During in situ HVEM deformation in the [100] direction of gamma'(1) plates nucleated on pre-existing ones. At later deformation stages 18R martensite was formed in stacks of narrow needles. The Following crystallographic relationship was observed: [001]beta(1) parallel to[010]beta'(1), gamma'(1) and [110]beta(1) parallel to[001]beta'(1), gamma'(1). A small permanent deformaticn observed after stress release was connected with the presence of residual martensite of a high random stacking fault density and consisting often of alpha'(1), gamma'(1) and beta'(1) martensite layers. During deformation in the (110) direction a larger permanent deformation and a density of dislocations was observed. Copyright (C) 1996 Acta Metallurgica Inc.
  • 加藤博之, 三浦
    Philosophical Magazine. A. 71 4 781 - 803 1995年 [査読有り][通常論文]
  • H.Kato, N.Hirata, S.Miura
    Acta Metallurgica et Meterialia 43 1 361  1995年 [査読有り][通常論文]
  • 加藤博之, 三浦
    Acta Metallurgica et Materialia 43 1 351 - 358 1995年 [査読有り][通常論文]
  • H KATO, T KOYARI, M TOKIZANE, S MIURA
    ACTA METALLURGICA ET MATERIALIA 42 4 1351 - 1358 1994年04月 [査読有り][通常論文]
     
    The shape memory properties of the TiNi alloy produced by a powder metallurgical method have been evaluated from tensile stress-strain curves. The contamination of the powders during atomization can be suppressed by applying the Plasma Rotating Electrode Process (P-REP), so that the compact made by Hot Isostatic Pressing (HIP) is expected to exhibit the shape memory effect identical to the typical alloy grown from melt. The fracture behavior of the P/M alloy is also studied, and the improvement of fracture strength of the P/M alloy is attempted.
  • H.Kato, J.Dutkiewicz, S.Miura
    Acta Metallurgica et Materialia 42 4 1359 - 1365 1994年 [査読有り][通常論文]
  • H KATO, T KOYARI, S MIURA, K ISONISHI, M TOKIZANE
    SCRIPTA METALLURGICA ET MATERIALIA 24 12 2335 - 2340 1990年12月 [査読有り][通常論文]

書籍

  • Shape Memory and Superelasticity in Powder Metallurgy TiNi Alloys
    Proceedings of ICOMAT-92 1992年
  • Pseudoelasticity and Shape Memory Effect in Mn- 18. 6at. % Cu Alloy Single Crystal
    Proceedings of ICOMAT-92 1992年
  • Shape Memory and Mechanical Properties in Powder Metallurgy TiNi Alloys
    Mechanical Behaviour of Materials. Pergamon 1991年
  • Superelasticity, Shapememory and Aging Effects in Cu-15at. % Sn alloy Single Crystals
    Proc. MRAS Int'l. Mtg. on Adv. Mats. 1989年

講演・口頭発表等

  • 形状記憶合金コイルばねの大変形解析  [通常講演]
    鈴木和, 加藤博之
    日本機械学会北海道支部第56回講演会 2018年10月 口頭発表(一般)
  • NiTi形状記憶合金の超弾性機能疲労特性と形状記憶処理の関係  [通常講演]
    木内智之, 加藤博之
    日本機械学会北海道支部第56回講演会 2018年10月 口頭発表(一般)
  • すべり変形したアルミニウム多結晶における微小荷重圧子押し込み試験  [通常講演]
    中谷友哉, 加藤博之
    日本機械学会北海道支部第56回講演会 2018年10月 口頭発表(一般)
  • NiTi形状記憶合金繊維/アルミニウム複合材料の相変化潜熱蓄熱効果  [通常講演]
    浅野謙進, 加藤博之
    日本機械学会北海道支部第56回講演会 2018年10月 口頭発表(一般)
  • 木製硬式野球用バットの衝撃変形特性  [通常講演]
    川上順悟, 加藤博之
    日本機械学会北海道支部第56回講演会 2018年10月 口頭発表(一般)
  • 引っ張り/圧縮荷重下のアルミニウム板状試料における微小荷重押し込み試験  [通常講演]
    清水友太, 加藤博之
    JSME Hokkaido 2018年10月 口頭発表(一般)
  • 触診センサーを目指した剛体球の軟物質押し込み変形解析  [通常講演]
    若竹浩志, 加藤博之
    日本機械学会北海道支部第56回講演会 2018年10月 口頭発表(一般)
  • 離散要素法による剛体粒子集合体の接触点すべり解析  [通常講演]
    久々津諒平, 加藤博之
    日本機械学会北海道支部第56回講演会 2018年10月 口頭発表(一般)
  • 回位の弾性特異応力場とひずみエネルギーの試料寸法依存性  [通常講演]
    加藤博之, 鳥井俊作
    第3回マルチスケール材料力学シンポジウム 2018年05月 口頭発表(一般)
  • 形状記憶合金の熱弾性型マルテンサイト変態における変態潜熱量  [通常講演]
    加藤博之, 浅野謙進
    日本金属学会H30春期大会講演会 2018年03月 口頭発表(一般)

受賞

  • 1999年 日本材料学会学術奨励賞

共同研究・競争的資金等の研究課題

  • 形状記憶素材を活用した軽量・低温強度を有する新規複合材料の開発
    JST:シーズ育成
    研究期間 : 2008年12月 -2009年03月 
    代表者 : 加藤博之
  • 金属間化合物の中間温度および高温疲労挙動
    JSPS:奨励(A)
    研究期間 : 1998年04月 -1999年03月 
    代表者 : 加藤 博之
  • 粉末焼結メゾ粒子ニチノール超弾性・彫塑生形状記憶合金の開発
    JSPS:科学研究費 試験B
    研究期間 : 1995年04月 -1998年03月 
    代表者 : 加藤博之
  • 三重結晶の変形,破壊挙動に基づいた粒界設計に関する研究
    JSPS:科学研究費 一般(A)
    研究期間 : 1994年04月 -1996年03月 
    代表者 : 三浦精
  • TiNi形状記憶合金の高温変形
    JSPS:科学研究費 奨励(A)
    研究期間 : 1993年04月 -1994年03月 
    代表者 : 加藤博之
  • CuAlMn形状記憶合金単結晶の超弾性と形状記憶効果
    JSPS:科学研究費 奨励(A)
    研究期間 : 1992年04月 -1993年03月 
    代表者 : 加藤博之
  • Plastic deformation of intermetallic compounds
  • Stress-strain behavior during plastic deformation of metals stress-strain behavior
  • Stress-strain behavior of shape memory allos

教育活動情報

主要な担当授業

  • Elasticity(弾性力学E)
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 材料力学、弾性力学、テンソル解析, 有限要素法、境界要素法
  • 弾性力学特論
    開講年度 : 2018年
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : 材料力学、弾性力学、テンソル解析, 有限要素法、境界要素法
  • Elasticity(弾性力学E)
    開講年度 : 2018年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : 材料力学、弾性力学、テンソル解析, 有限要素法、境界要素法
  • 弾性力学特論
    開講年度 : 2018年
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : 材料力学、弾性力学、テンソル解析, 有限要素法、境界要素法
  • 固体力学系演習Ⅱ
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 演習、材料力学、弾性、棒、軸、はり、柱、組合せ応力
  • 材料力学Ⅱ
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 線形弾性、組合応力、力と変形、仕事とエネルギー、材料の強さ、設計、座屈
  • 機械加工学実習
    開講年度 : 2018年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 鋳造、溶接、塑性加工、切削加工、研削加工、先端加工


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