LAUSR

This study aims to determine the plastic deformation characteristics of aluminum 5052-O based on non-associated flow rule. To achieve this goal, a new strain hardening model named as Kim-Tuan hardening model is proposed to perfectly describe the stress-strain relation of the studied material in terms of the uniaxial tensile test and to predict the material’s post-necking behavior. Additionally, the plastic behaviors of AL5052-O sheet are described by two approaches: the associated flow rule with YLD2000-2d yield function and the non-associated flow rule with Hill's quadratic function (NAFR-Hill48). The parameters of these functions were derived from the material properties that were obtained from uniaxial tensile tests and bulge test. The flow curve based on Kim-Tuan model and plastic behaviors obtained from two above-mentioned approaches were imported into a finite element analysis code to simulate the hydraulic bulge test for this material to confirm the precision of material characteristics achieved before. The simulation results based on the NAFR-Hill48 match well with the experiment results of bulge test while the YLD2000-2d provides highly accurate predictions for anisotropy of this material.