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A study on the constitutive equation of HC420LA steel subjected to high strain rates

Published online by Cambridge University Press:  23 January 2019

Junjia Cui Open the ORCID record for Junjia Cui [Opens in a new window] ,
Qiong Wang ,
Dongying Dong ,
Hao Jiang ,
Xu Zhang Open the ORCID record for Xu Zhang [Opens in a new window]  and
Guangyao Li
Junjia Cui
Affiliation:
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
Qiong Wang
Affiliation:
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
Dongying Dong
Affiliation:
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
Hao Jiang
Affiliation:
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
Xu Zhang
Affiliation:
College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China
Guangyao Li*
Affiliation:
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
*
a)Address all correspondence to this author. e-mail: gyli@hnu.edu.cn
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Abstract

In this paper, the influence of strain rate on the mechanical behavior of high-strength low-alloy (HC420LA) steel were studied. Quasi-static and dynamic tensile experiments were performed with strain rates ranging from 0.001 to 500 s−1 at room temperature. The digital image correlation technique was used to obtain the full-field strain. The experimental results showed that HC420LA steel exhibited positive strain rate sensitivity. Based on experimental results, the modified Johnson–Cook (J–C) model was used to model the constitutive behavior of HC420LA steel. Predictions of the standard and modified J–C models were compared using standard statistical parameters. The modified J–C model showed better agreement with the experimental data. Then, numerical simulation of the representative tensile test at a strain rate of 100 s−1 was performed using the finite element code LS-DYNA. Good correlation between the experimental and numerical simulation results was achieved.

Keywords

high strain ratedigital image correlationstrain distributionconstitutive modelingfinite element simulation
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 6 , 28 March 2019 , pp. 1034 - 1042
Copyright
Copyright © Materials Research Society 2019 

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