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International Journal of Automotive Technology > Volume 20(6); 2019 > Article
International Journal of Automotive Technology 2019;20(6): 1183-1193.
doi: https://doi.org/10.1007/s12239-019-0111-y
EFFECT OF ANISOTROPIC PLASTICITY ON THE PREDICTION OF FORMABILITY OF E-FORM MAGNESIUM ALLOY SHEET
Yongheon Lee1, Seungyoon Jung2, Hansung Baek2, Jinwoo Lee3, Moon-Seok Choi4, Myoung-Gyu Lee5
1Ssangyong Motor Co.
2Q&C TECH
3Korea Institute of Materials Science
4Eum Creative
5Seoul National University
PDF Links Corresponding Author.  Myoung-Gyu Lee , Email. myounglee@snu.ac.kr
ABSTRACT
In this paper, the formability of E-FORM magnesium alloy sheet (as one of recent alloys for automotive magnesium sheets) is analyzed based on the comparison between the results of actual magnesium (Mg) roof forming and those of finite element (FE) simulations. The FE model considers anisotropic mechanical properties and forming limit diagram (FLD) of the investigated magnesium alloy sheet. Through the coupled experimental and numerical procedure, the dominating factors for improving the accuracy of the numerical simulations are further studied. A commercial finite element analysis program, AUTOFORM®, is used for the simulations, in which identified mechanical properties and forming limit criteria are implemented as functions of temperature and strain rate. The improvement in the prediction of formability during the warm forming of the E-FORM magnesium alloy sheet can be obtained by considering a modified hardening law at large strain region, sheet anisotropy, and the properly measured forming limit curve.
Key Words: Mg alloy, Finite element analysis, Warm forming, Anisotropy, Hardening, Formability
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