Ductile Damage Evolution under Non-Proportional Loading

Abstract

In this paper a coupled elasto-plastic and damage model is presented and applied to predict the ductile damage accumulation under non-proportional loading conditions. The ductile damage constitutive equations, within the framework of the continuum damage mechanics, were coupled with the unconventional plasticity model Extended Subloading Surface¹⁾ in order to investigate the degradation of the mechanical performance of metals under the development of plastic deformation. Moreover, the tangential inelastic contribution²⁾ was introduced to simulate the acceleration of the damage evolution observed during experiments carried out under non-proportional loading paths.