Applying the damage constitutive model for predicting thermal deformation of AA7075 aluminum sheet

In this paper, a uniaxial damage model of AA7075, coupled with strain, strain rate, temperature, dislocation, hardening, and damage, was established. The model was calibrated using Genetic Algorithm Tool based on hot uniaxial tensile tests at temperatures ranging from 400°C to 500 °C and strain rates ranging from 0.1 s-1 to 10 s-1. Fitting curves of the unified damage constitutive model were in good agreement with experimental results. The evolution of damage factor was related to temperature, strain rate and strain. As strain increases, damage factor accumulated and evolved to make the material failure. A finite element (FE) model with implementation of uniaxial damage model was established using ABAQUS to predict damage evolution in hot tensile tests. Experimental results verified the established FE model, indicating that the damage model can be used to predict the thermal deformation of AA7075.