Simulations of plastic deformation by anisotropic hardening yield functions for QP1180

Abstract

This research compares the accuracy, computation efficiency and user-friendliness of the Hill48 and three anisotropic hardening models (S-Y 2009, CQN and newly proposed one) for QP1180 steel sheet. Experiments are conducted with dogbone and notched specimens along RD, DD and TD and bulging specimens for strain hardening behavior under equibiaxial tension. These models are calibrated by the experimental data above. The calibrated models are applied to simulate the uniaxial tension and plane strain tension tests for the metal. The simulation time and accuracy of the models are compared for both uniaxial tension and plane strain tension tests to evaluate their accuracy and computation efficiency. The results suggest that the CQN and proposed models are the most accurate among the four models compared, but the computation efficiency of the proposed model can dramatically reduce the numerical simulation time by 20%~40% compared to the CQN model. The comparison shows that the proposed model is the most accurate and is higher in numerical computation efficiency for engineers. Therefore, the proposed model is recommended to be utilized to describe anisotropic hardening behaviors during sheet metal forming processes.