Identification of the damage parameters for anisotropic materials by inverse technique: application to an aluminium

A damage model is integrated into the explicit finite element framework to predict the damage evolution which occurs under dynamic loading in the crash or stamping process. This damage model is based on the description of the nucleation, growth and coalescence of the microvoids. This damage process leads to the progressive loss of the stress-carrying capacity leading to rupture. The model is adapted to take the material behaviour anisotropy and damage anisotropy into account. An inverse method is developed to identify the material parameters by correlating an experimental and numerical measurement with a tensile test on a notched specimen. This identification methodology is applied to an aluminium part cut from an extruded tube. The material parameters are identified and the ductile rupture is predicted.