Prediction of Work-hardening Behavior under Various Loading Paths in 5083-O Aluminum Alloy Sheet using Crystal Plasticity Models

The purpose of this study was to examine appropriate crystal plasticity models for reproducing work-hardening behaviors of an A5083-O Al alloy sheet under monotonic tension, reverse loading from compression to tension, biaxial tension, and simple shear. An accumulated-slip-based hardening model with the extended Voce hardening law and a dislocation-density-based hardening model were used in the simulations. The dislocation-density-based model gave better predictive accuracy than that of the accumulated-slip-based model, especially for biaxial tension. A new accumulated-slip-based hardening model was then proposed to improve the predictive accuracy by considering an anisotropic property in the interaction matrix. The predictive accuracy of the new model was comparable to that of the dislocation-density-based hardening model. This result suggested that the modelling of the interaction matrix played an important role in the predictive accuracy of the work-hardening behaviors.