Prediction of forming limit diagram with mixed anisotropic kinematic–isotropic hardening plastic constitutive model based on stress criteria

This paper presents an investigation of predicting the forming limit diagram (FLD) based on a stress criterion. The prediction is achieved by employing an anisotropic plastic model with a mixed kinematic–isotropic hardening formulation recently developed by the authors. The loading conditions considered include both proportional and non-proportional loading. The applicability of the stress FLD (SFLD) under the loading conditions and different rolling directions is examined and discussed for AL2008-T4.