Method for Determining the Flow Curve of Steel Considering Work Hardening Behavior

Atsushi Suzuki, Kazuo Okamura, Osamu Kada

ICTP 2023 Lecture Notes in Mechanical Engineering　p. 488-497　2023/09/20　Research paper (international conference proceedings)

Measurement of Transformation Plasticity during Heating of Bearing Steel

Takayuki Otsuka, Seiji Ito, Kazuo Okamura

Journal of the Society of Materials Science, Japan　Vol. 72　No. 9　p. 683-688　2023/09　Research paper (scientific journal)

Heat Treatment Simulation Considering Anisotropy Caused by Micro Segregation

Yusuke Kawaragi, Kei Miyanishi, Kazuo Okamura

Journal of the Society of Materials Science, Japan　Vol. 72　No. 11　p. 782-789　2023/05　Research paper (scientific journal)

Evaluation of Influencing Factors on Plasticity during Tempering Process

Yosuke Yamazaki, Kazuo Okamura, Yoji Shibutani

Journal of the Society of Materials Science, Japan　Vol. 69　No. 7　p. 555-562　2022/07　Research paper (scientific journal)

Development of Sheet Metal Forming Analysis Incorporating Phase-transformation Model for Hot Stamping

K Uenishi, M Kubo, T Suzuki, K Okamura

IOP Conference Series: Materials Science and Engineering　Vol. 967　No. 1　p. 012023-012023　2020/11/01　Research paper (international conference proceedings)

Plastic behaviours during tempering by crystal plasticity analyses using fast Fourier transform

Yosuke Yamazaki, Takayuki Otsuka, Kazuo Okamura, Yoji Shibutani

Materials Science and Technology　Vol. 36　No. 6　p. 750-758　2020/03/11　Research paper (scientific journal)

Analysis of shear fatigue properties of iron single crystals regarding possible effects of the resolved normal stresses on the slip planes

Mamoru Hayakawa, Eisuke Nakayama, Kazuo Okamura, Miyuki Yamamoto, Kazuyuki Shizawa

Materials Today Communications　Vol. 21　p. 100567-100567　2019/12　Research paper (scientific journal)

Microstructure and heat treatment effect on transformation strain in steels: part1 experiment

Takayuki Otsuka, Daisuke Satani, Kenji Yamamoto, Kazuo Okamura, Renald Brenner, Brigitte Bacroix

Materials Science and Technology　Vol. 35　No. 2　p. 181-186　2018/11/27　Research paper (scientific journal)

Microstructure and heat treatment effect on transformation strain in steels: part 2 modelling

Takayuki Otsuka, Daisuke Satani, Kenji Yamamoto, Kazuo Okamura, Renald Brenner, Brigitte Bacroix

Materials Science and Technology　Vol. 35　No. 2　p. 187-194　2018/11/25　Research paper (scientific journal)

Effect of anisotropy evolution on circular and oval hole expansion behavior of high-strength steel sheets

Toshiya Suzuki, Kazuo Okamura, Gustavo Capilla, Hiroshi Hamasaki, Fusahito Yoshida

International Journal of Mechanical Sciences　Vol. 146-147　p. 556-570　2018/10　Research paper (scientific journal)

Evaluating microscopic hardness in ferritic steel based on crystallographic measurements via electron backscatter diffraction

Mamoru Hayakawa, Kota Tomatsu, Eisuke Nakayama, Kazuo Okamura, Miyuki Yamamoto, Kazuyuki Shizawa

Materials Science and Engineering: A　Vol. 700　p. 281-290　2017/07　Research paper (scientific journal)

Estimation of Residual Stress Change due to Cyclic Loading by Classical Elastoplasticity Model and Subloading Surface Model

Ryota Higuchi, Kazuo Okamura

Key Engineering Materials　Vol. 725　p. 281-286　2016/12　Research paper (scientific journal)

Application of Subloading Surface Model to Heat Treatment Simulation Based on Explicit Finite Element Method

Yusuke Kawaragi, Kazuo Okamura

Key Engineering Materials　Vol. 725　p. 287-292　2016/12　Research paper (scientific journal)

Effect of Material Anisotropies of Hot-Rolled High-Strength Steel Sheet on Localized Deformation Behavior in Hole Expansion - Part-I Experimental Consideration to Circular and Oval Hole

Toshiya Suzuki, Kazuo Okamura, Yuya Ishimaru, Hiroshi Hamasaki, Fusahito Yoshida

Key Engineering Materials　Vol. 725　p. 592-597　2016/12　Research paper (scientific journal)

Effect of Material Anisotropies of Hot-Rolled High-Strength Steel Sheet on Localized Deformation Behavior in Hole Expansion - Part-II Simulation and Evaluation of Anisotropic Yield Function

Kazuo Okamura, Toshiya Suzuki, Yuya Ishimaru, Hiroshi Hamasaki, Fusahito Yoshida

Key Engineering Materials　Vol. 725　p. 598-603　2016/12　Research paper (scientific journal)

Determination of the Anisotropic Hardening of Sheet Metals at Large Strain from Stretch Bending Test

Gustavo Capilla, Hiroshi Hamasaki, Fusahito Yoshida, Toshiya Suzuki, Kazuo Okamura

Key Engineering Materials　Vol. 725　p. 677-682　2016/12　Research paper (scientific journal)

Modeling of material behavior and cooling process in heat treatment simulation

Kazuo Okamura

Proc. of 5th Asian Conference on Heat Treatment and Surface Engineering　p. 10-17　2016/11　Research paper (international conference proceedings)

Influence of Pre-Heat Treatment Condition on Simulation Resilts of Quenching Residual Stress

Kenji Yamamoto, Kazuo Okamura, Michiharu Narazaki

Journal of the Japan Cociety for Heat Treatment　Vol. 56　No. 3　p. 135-143　2016/08　Research paper (scientific journal)

Development of Micro-shear Fatigue Test and its Application to Single Crystal of Pure Iron

M. Hayakawa, E. Nakayama, K. Okamura, M. Yamamoto, K. Shizawa

Procedia Engineering　Vol. 160　p. 167-174　2016　Research paper (scientific journal)

Evaluation of microscopic hardness in ferrite steel based on crystallographic measurements by EBSD and the applications in fatigue strength prediction

Hayakawa M, Saito T, Nakayama E, Okamura K, Yamamoto M, Shizawa K

International Conference on Advanced Technology in Experimental Mechanics 2015 Abstract book　p. 41-41　2015/10　Research paper (international conference proceedings)

Effect of Implicit Integration Scheme in Residual Stress Analysis of Quenching Considering Transformation Plasticity and Kinematic Hardening

Yusuke Kawaragi, Manabu Fukumoto, Kazuo Okamura

Journal of the Society of Materials Science, Japan　Vol. 64　No. 4　p. 258-265　2015/04　Research paper (scientific journal)

High Accurate Prediction of Residual Stress Considering Plasticity during Tempering Process

Yosuke Yamazaki, Kazuo Okamura, Takahisa Suzuki

Journal of the Society of Materials Science, Japan　Vol. 64　No. 4　p. 266-273　2015/04　Research paper (scientific journal)

Extension of subloading surface model for accurate prediction of elastoplastic deformation behavior of metals with cyclic softening

Ryota HIGUCHI, Kazuo OKAMURA, Fumio OHTA, Koichi HASHIGUCHI

Transactions of the JSME (in Japanese)　Vol. 80　No. 812　p. SMM0082-SMM0082　2014　Research paper (scientific journal)

Application of High-Strength Nonoriented Electrical Steel to Interior Permanent Magnet Synchronous Motor

Ichiro Tanaka, Hirokatsu Nitomi, Kenji Imanishi, Kazuo Okamura, Hiroyoshi Yashiki

IEEE Transactions on Magnetics　Vol. 49　No. 6　p. 2997-3001　2013/06　Research paper (scientific journal)

Estimation model for magnetic properties of stamped electrical steel sheet

Yoshiyuki Kashiwara, Hiroshi Fujimura, Kazuo Okamura, Kenji Imanishi, Hiroyoshi Yashiki

Electrical Engineering in Japan　Vol. 183　No. 2　p. 1-11　2013/01/24　Research paper (scientific journal)

Estimation Model for Magnetic Properties of Stamped Electrical Steel Sheet

Yoshiyuki Kashiwara, Hiroshi Fujimura, Kazuo Okamura, Kenji Imanishi, Hiroyoshi Yashiki

IEEJ Transactions on Fundamentals and Materials　Vol. 131　No. 7　p. 567-574　2011　Research paper (scientific journal)

Crash Performance Evaluation of Automotive Members Coupled with Fracture Prediction of Spot Weld

Hideki Ueda, Kazuo Okamura, Hiroyuki Fujimoto, Eisuke Nakayama, Tohru Okada

Transaction of Society of Automotive Engineers of Japan　Vol. 41　No. 4　p. 817-822　2010/07　Research paper (scientific journal)

Evaluation of Crash Performance in Steel Sheet Parts Coupled with Fracture Prediction of Spot Welded Joint

Ueda H, Okamura K, Nakayama E, Fujimoto H, Okada T, Uchihara M, Fukumoto M

Proceedings of FISITA2010 World Automotive Congress　p. C- 128-C- 128　2010/05　Research paper (international conference proceedings)

Evaluation of local fatigue strength in spot weld by small specimen

E. NAKAYAMA, M. FUKUMOTO, M. MIYAHARA, K. OKAMURA, H. FUJIMOTO, K. FUKUI, T. KITAMURA

Fatigue & Fracture of Engineering Materials & Structures　Vol. 33　No. 5　p. 267-275　2010/01　Research paper (scientific journal)

Finite Element Analysis of a Steering Rack Shaft Subjected to the High-Frequency Induction Hardening Process

Manabu Fukumoto, Kazuhiko Kizawa, Kazuo Okamura, Atsuhiko Ohta

Journal of the Japan Society for Heat Treatment　Vol. 49　p. 689-692　2009　Research paper (scientific journal)

Measurement and Idetification of Transformation Plasticity Characteristics

Kazuo Okamura, Kenji Yamamoto, Takayuki Saito, Manabu Fukumoto

Journal of the Japan Society for Heat Treatment　Vol. 49　2009　Research paper (scientific journal)

Paractical Model to Predict Heat Transfer Coefficient in High Pressured Gas Quenchig

Hiroshi Nogami, Kazuo Okamura, Tsuyoshi Sugimoto, Yoichi Watanabe, Michiharu Narazaki

Journal of the Japan Society for Heat Treatment　Vol. 49　p. 713-716　2009　Research paper (scientific journal)

FE Analysis Method with Phase Transformation and Tempering Effect

Yosuke Yamazaki, Kazuo Okamura, Taizo Makino, Tomoaki Sera

Journal of the Japan Society for Heat Treatment　Vol. 49　p. 745-748　2009　Research paper (scientific journal)

Finite Element Analysis of Deformation and Residual Stress in Induction Hardened Steel Bar

Masahiro Ogawa, Kazuo Okamura, Kenji Yamamoto, Masaki Kobayashi

Journal of the Japan Society for Heat Treatment　Vol. 49　p. 749-752　2009　Research paper (scientific journal)

FEM Analysis Method with Phase Transformation and Tempering Effect

Yosuke Yamazaki, Kazuo Okamura, Taizo Makino, Tomoaki Sera

Vol. 74　No. 743　p. 926-932　2008/07　Research paper (scientific journal)

Metallo-thermo-mechanical Simulation of Carburized Quenching Process by Several Codes -- A Benchmark Project --

Tatsuo Inoue, Yoichi Watanabe, Kazuo Okamura, Michiharu Narazaki, Hayato Shichino, Dong-Ying Ju, Hideo Kanamori, Katsumi Ichitani

Key Engineering Materials　Vol. 340-341　p. 1061-1066　2007　Research paper (scientific journal)

Development of Simulation Tool for Optimizing Operation Conditions of Carburized Quenching Process

Watanabe Y, Inoue T, Ju D-Y, Shichino H, Okamura K, Narazaki M, Kanamori H, Ichitani K

Proceedings of FISITA 2006 World Automotive Congress　p. M214T-M214T　2006/10　Research paper (international conference proceedings)

Fatigue Strength Prediction of Spot-Welded Joints Using Small Specimen Testing

Nakayama E, Fukumoto M, Miyahara M, Okamura K, Fujimoto H, Fukui K

p. CD-ROM-CD-ROM　2006　Research paper (international conference proceedings)

Cooperative Research to Optimize Heat Treating Process Condition by Computer Based Technology

Yoichi Watanabe, Dong-Ying Ju, Hayato Shichino, Kazuo Okamura, Michiharu Narazaki, Hideo Kanamori, Katsumi Ichitani, Tatsuo Inoue

Solid State Phenomena　Vol. 118　p. 349-354　2006　Research paper (scientific journal)

Material Properties for Quenching Simulation and Assessment on Computational Results

Okamura K, Yamamoto K, Fukumoto M

p. 353-355　2005/11　Research paper (international conference proceedings)

Recent Development of Heat Treating Simulation in Japan

Inoue T, Watanabe Y, Okamura K, Narazaki M, Shichino H, Ju D-Y, Kanamori H, Ichitani K

Proc. 1st International Conference on Distortion Engineering　p. 133-140　2005/09　Research paper (international conference proceedings)

Measurements of Local Mechanical Properties of Spot Welds and Prediction of Tensile-Shear Strength of Spot-Welded Joints

Eisuke Nakayama, Kazuo Okamura, Mitsuo Miyahara, Michitaka Yoshida, Kiyoyuki Fukui, Hiroki Fujimoto

Transaction of Society of Automotive Engineers of Japan　Vol. 36　No. 1　p. 205-210　2005　Research paper (scientific journal)

Occurence Mechanism and Prevention Method of Longitudinal Surface Cracks Near Slab Corner in Continuous Casting

Yoshiyuki Matoba, Kazuo Okamura, Toshihiko Murakami, Kenji Yamamoto

JSME International Journal, Seties A　Vol. 48　No. 3　p. 163-170　2005　Research paper (scientific journal)

A Cooperative Activity on Quenching Process Simulation --- Japanese IMS-VHT Project on the Benchmark Analysis and Experiment ---

Inoue T, Watanabe Y, Okamura K, Narazaki M, Shichino H, Ju D-Y, Kanamori H, Ichitani K

Transactions of Materials and Heat Treatment, Proc. of the 14th IFHTSE Congress　Vol. 25　No. 4　p. 28-34　2004/11　Research paper (international conference proceedings)

Prediction of Fatigue Strength of Spot-Welded Joints Based on Local Material Strength Properties Measured by Small Specimen

Eisuke Nakayama, Mitsuo Miyahara, Kazuo Okamura, Hiroki Fijimoto, Kiyoyuki Fukui

Journal of the Society of Materials Science, Japan　Vol. 53　No. 10　p. 1136-1142　2004/10　Research paper (scientific journal)

Prediction of Strength of Spot-Welded Joints by Measurements of Local Mechanical Properties

Nakayama E, Okamura K, Miyahara M, Yoshida M, Fukui K, Fujimoto H

Proc. International Body Engineering Conference　p. 313-318　2003/10　Research paper (international conference proceedings)

Finite Element Simulation of Resistance Spot Welding Process

Fukumoto M, Fujimoto H, Okamura K, Fukui K

Proc. International Body Engineering Conference　p. 437-442　2003/10　Research paper (international conference proceedings)

Three-Dimensional FEM Analysis of Helical Gear Subjected to the Carburized Quenching Process

Manabu Fukumoto, Masatoshi Yoshizaki, Hideki Imataka, Kazuo Okamura, Kenji Yamamoto

Journal of the Society of Materials Science, Japan　Vol. 50　No. 6　p. 598-605　2001/06　Research paper (scientific journal)

Three Dimensional FEM Analysis of a Helical Gear Subjected to the Carburized Quenching Process

Fukumoto M, Yoshizaki M, Imataka H, Okamura K, Yamamoto K

Material Science Research International Special Technical Publication-2　p. 475-480　2001/03　Research paper (international conference proceedings)

Development of Crankshaft Configuration Design

Fujimoto T, Yamamoto M, Okamura K, Hida Y

SAE Technical Paper Series　p. 01-1008-01-1008　2001/03　Research paper (international conference proceedings)

Material Database for Simulation of Metallo-Thermo-Mechanical Field

Inoue T, Okamura K

20th ASM Heat Treating Society Conference Proceedings　p. 753-760　2000/10　Research paper (international conference proceedings)

Occurence Mechanism and Prevention Method of Longitudinal Surface Cracks Near Slab Corner in Continuous Casting

Yoshiyuki Matoba, Kazuo Okamura, Toshihiko Murakami, Kenji Yamamoto

Vol. 66　No. 646　p. 1127-1133　2000/06　Research paper (scientific journal)

Analysis for non-linear behavior of buried pipeline due to liquefaction with lateral spreading

Shiro Takada, Takanobu Suzuki, Takeshi Koike, Yasuo Ogawa, Naoyuki Hosokawa, Tetsuji Kitano, Kazuo Okamura, Takeshi Kuwajima

Vol. 46A　p. 947-956　2000/03　Research paper (scientific journal)

Creep-Fatigue Life Prediction for Ligaments of Boiler Headers by Strain Range Partitioning Method

Hayakawa H, Miyahara M, Kanaya A, Okamura K, Hirota M, Tanaka K

Proc. Case Histories on Integrity and Failures in Industry　p. 885-894　1999/10　Research paper (international conference proceedings)

Creep-Fatigue Life Prediction for Ligament of Boiler Headers by Strain Range Partitioning Method

Hiroyuki Hayakawa, Mitsuo Miyahara, Akihiro Kanaya, Kazuo Okamura

Journal of the Society of Materials Science, Japan　Vol. 48　No. 6　p. 604-609　1999/06　Research paper (scientific journal)

Thin slab casting with liquid core reduction

A. Yamanaka, S. Kumakura, K. Okamura, T. Kanazawa, T. Murakami, M. Oka, I.Takeuchi, T.Watanabe

Ironmaking and Steelmaking　Vol. 26　No. 6　p. 457-462　1999　Research paper (scientific journal)

New Design to Prevent Internal Cracking in Continuous Casting

Yamanaka A, Okamura K, Kumakura S, Kanazawa T, Tamura A

3rd European Conference on Continuous Casting　p. 415-424　1998/10　Research paper (international conference proceedings)

Shell/beam hybrid analysis method of large-scale elastic and plastic deformation patterns of buried piping under the influence of lateral flows in liquefaction

Vol. 10　p. 61-66　1998　Research paper (scientific journal)

Mechanism of Internal Cracking in Continuous Casting

Akihiro Yamanaka, Kazuo Okamura, Takashi Kanazawa

Vol. 82　p. 999-1004　1996/12

Critical strain for internal crack formation in continuous casting

A. Yamanaka, K. Nakajima, Kazuo Okamura

Ironmaking and Steelmaking　Vol. 22　p. 508-512　1995　Research paper (scientific journal)

Calculation of Bulging Strain and Its Application to Prediction of Internal Cracks in Continuously Cast Slabs

Okamura K, Kawashima H

Proc. International Conference on Computer-Assisted Materials Design and Process Simulation(COMP93)　p. 129-134　1993/10　Research paper (international conference proceedings)

Coupled Analysis between Thermal Deformation and Heat Transfer of Solidifying Steel Shell In Continuous Casting Mold

Okamura K, Yamamoto K

Modeling of Casting, Welding and Advanced Solidification Process VI　p. 535-542　1993/03　Research paper (international conference proceedings)

Inclusion Transfer Behavior across Molten Steel-Slag Interface

Nakajima K, Okamura K

4th International Conference on Molten Slags and Fluxes　p. 505-510　1992　Research paper (international conference proceedings)

Finite Element Analysis of Quenching Deformation in Clad-Steel Plate

Okamura K, Kawashima K

Residual Stresses III　p. 214-219　1992　Research paper (international conference proceedings)

Three-Dimensional Strain Analysis in Continuously Cast Slabs

Okamura K, Kawashima H

Proc. The 6th International Iron and Steel Congress　Vol. 3　p. 393-400　1990/10　Research paper (international conference proceedings)

High Tempeature Material Properties of Ceramics-Heat Resistant Alloy Composites

Kazuo Okamura, Yoshiyasu Morita, Hisakazu Kawashima

Proc. of 33rd Japan Congress of Material Research　p. 117-122　1990　Research paper (scientific journal)

High Temperature Material Properties of Ceramics Particle Composite

Yoshiyasu Morita, Kazuo Okamura, Hisakazu Kawashima, Manabu Seguchi

Vol. 75　No. 9　p. 1596-1603　1989/09　Research paper (scientific journal)

Three-dimensional Elasto-plastic and Creep Analysis of Bulging in Continuously Cast Slabs

Kazuo Okamura, Hisakazu Kawashima

Vol. 75　No. 10　p. 1905-1912　1989　Research paper (scientific journal)

Analysis of Residual Deformation of a Gear During Quenching

Kazuo Okamura, Hisakazu Kawashima

Proc. of 32nd Japan Congress on Materials Research　p. 323-329　1989　Research paper (scientific journal)

Three-dimensional Elasto-plastic and Creep Analysis of Bulging in Continuously Cast Slabs

Kazuo Okamura, Hisakazu Kawashima

ISIJ International　Vol. 29　No. 8　p. 666-672　1989　Research paper (scientific journal)

Finite Element Analysis of Thermal Stress in Heat Treatment

Kazuo Okamura, Hisakazu Kawashima

Journal of the Japan Society for Heat Treatment　Vol. 28　No. 3　p. 141-148　1988/06　Research paper (scientific journal)