不同屈服准则对 MP980 钢和 5182-O 铝合金塑性各向异性描述能力研究

Based on the experimental data of uniaxial tension with different angles along the rolling direction and cruciform specimen biaxial tension under different loading paths of MP980 steel and 5182-O aluminum alloy, through calculating the measured data and the prediction errors of uniaxial tensile yield stresses and r-values, equi-biaxial tensile yield stress and r-value, and plastic work contours predicted by different material models for quantitatively evaluating, the abilities of Hill48, Barlat 91 (New) with different material parameter identification strategies, and Yld2000-2d anisotropic yield criteria to describe plastic anisotropy were analyzed. The effectiveness and applicability of these material models were evaluated. The results show that using stress anisotropy data to identify material parameters is more accurate in describing stress-related experimental data, and using deformation anisotropy data to identify material parameters is more accurate in describing r-values. Compared with the Hill48 and Barlat91 (New), the Yld2000-2d yield criterion, which accommodates more material parameters, can more accurately reflect the anisotropic yield behavior of the two blanks. When the same mechanical properties are used to identify the material parameters of the yield criterion, the higher-order model has higher prediction accuracy for the plastic work contours.