Constitutive modeling of evolving plasticity in high strength steel sheets
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DOI码：10.1016/j.ijmecsci.2016.01.006
发表刊物：International Journal of Mechanical Sciences
关键字：High strength steel; Evolving plasticity; FEM; Biaxial tensile test; Earing prediction.
摘要：In this paper, biaxial tensile tests with cruciform specimens were conducted to obtain the experimental plastic work contours of DP590, DP780 and DP980 sheets. It was found that for high strength dual phase steel sheets, the outlines of the experimental work contours in the first quadrant evolve evidently with the increase of plastic dissipation. In order to calibrate the evolving isotropic and anisotropic plastic behaviors simultaneously, the Yld2000-2d yield criterion with variable exponent and coefficients (Yld2000-2d-Var) was introduced. In this model, the exponent m and coefficients αi of the Yld2000-2d was assumed as the function of the equivalent plastic strain. The identification procedures of the introduced parameters were then proposed based on minimizing the difference between the experimental and the model predicted yield points, using Levenberg–Marquardt optimization method. Afterwards, the proposed model was implemented into ABAQUS as user subroutine VUMAT with semi-implicit back-Euler integration algorithm. The numerical simulations of hydro-bulging and cylindrical deep drawing tests were then carried out to verify the validity of the proposed model. The results showed that the proposed model could enhance the predicting accuracy in both tests due to its flexibility.
合写作者：Keshan Diao,Min Wan
第一作者：Zhengyang Cai
论文类型：期刊论文
通讯作者：Xiangdong Wu
学科门类：工学
文献类型：J
卷号：107
页面范围：43-57
是否译文：否
发表时间：2016-01-11
收录刊物：SCI