A shear stress dependent ductile damage model

摘要

Prediction of ductile damage is an important challenge for finite element modelling of thermo-mechanical forming processes. Existing plasticity theories intended for the prediction of the void growth are mainly formulated with the normal mean stress, without any influence of the deviatoric stress tensor. In order to take into account shear stress effects during the void growth, a yield function including the mass conservation and its corresponding flow rule is discussed and identified with a modified Rice and Tracey model.