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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor


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Open Access
Online
ISSN
2191-0324
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Volume 31, Issue 1

Issues

A Modified Johnson–Cook Model to Predict Stress-strain Curves of Boron Steel Sheets at Elevated and Cooling Temperatures

Nguyen Duc-Toan
  • Department of Mechanical Engineering, Jeju National University, Jeju-si, Jeju, Republic of Korea
  • School of Mechanical Engineering, Hanoi University of Science and Technology, Hai Ba Trung District, Hanoi City, Vietnam
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/ Banh Tien-Long
  • School of Mechanical Engineering, Hanoi University of Science and Technology, Hai Ba Trung District, Hanoi City, Vietnam
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/ Jung Dong-Won
  • Corresponding author
  • Department of Mechanical Engineering, Jeju National University, Jeju-si, Jeju, Republic of Korea
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/ Yang Seung-Han
  • Department of Mechanical Engineering, Kyungpook National University, Buk-ku, Daegu, Republic of Korea
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/ Kim Young-Suk
  • Department of Mechanical Engineering, Kyungpook National University, Buk-ku, Daegu, Republic of Korea
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Published Online: 2012-02-09 | DOI: https://doi.org/10.1515/htmp.2011.127

Abstract

In order to predict correctly stress-strain curve for tensile tests at elevated and cooling temperatures, a modification of a Johnson–Cook (J-C) model and a new method to determine (J-C) material parameters are proposed. A MATLAB tool is used to determine material parameters by fitting a curve to follow Ludwick and Voce's hardening law at various elevated temperatures. Those hardening law parameters are then utilized to determine modified (J-C) model material parameters. The modified (J-C) model shows the better prediction compared to the conventional one. An FEM tensile test simulation based on the isotropic hardening model for metal sheet at elevated temperatures was carried out via a user-material subroutine, using an explicit finite element code. The simulation results at elevated temperatures were firstly presented and then compared with the measurements. The temperature decrease of all elements due to the air cooling process was then calculated when considering the modified (J-C) model and coded to VUMAT subroutine for tensile test simulation. The modified (J-C) model showed the good comparability between the simulation results and the corresponding experiments.

Keywords.: Finite element method (FEM); boron steel; tensile test; cooling; hardening

About the article

Received: 2011-05-30

Accepted: 2011-07-14

Published Online: 2012-02-09

Published in Print: 2012-02-01


Citation Information: High Temperature Materials and Processes, Volume 31, Issue 1, Pages 37–45, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp.2011.127.

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