Applicability Analysis of Yield Criterion for Advanced High Strength Steels DP590 under Warm-forming Condition

doi:10.3901/JME.2016.04.029

Abstract

Abstract: In order to investigate the temperature effect on the yield behavior of the DP590 under warm forming condition, the yield loci are obtained by conducting biaxial and uniaxial tensile tests under different directions. The comparison of homogenized stresses of different tensile directions shows DP590 sheet obeys isotropic hardening law approximately and the shape and size of the yield loci are influenced by the temperature evidently. The yield criterion of Yld2000-2D proves to be a better choice for the accurate description of yield behavior under the warm-forming condition by comparing between the experimental and theoretical yield loci. Based on the equivalent stress and strain associated with the given yield criteria under different proportional loading paths, the applicability of Yld2000-2D yield criterion is verified. Furthermore, four polynomial function of temperature are used to fit the variation trend of the anisotropic parameters in Yld2000-2d yield function under different temperatures. The temperature-dependent yield criterion is then established by calibrating the dependence of the anisotropic criterion and the temperature. Compared with other commonly used yield criteria, the proposed temperature-dependent yield criterion is more accurate under warm-forming condition.

Key words: equivalent stress and strain, warm-forming condition, yield criteria, yield loci

CLC Number:

TP381

CHENG Cheng, DIAO Keshan, WU Xiangdong, WANG Wenping, WAN Min, CAI Zhengyang. Applicability Analysis of Yield Criterion for Advanced High Strength Steels DP590 under Warm-forming Condition[J]. Journal of Mechanical Engineering, 2016, 52(4): 29-35.

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