Biaxial Experiments and Numerical Simulations on Damage and Fracture Mechanisms in Ductile Metals at Different Loading Conditions

Abstract

The paper deals with an anisotropic damage and fracture model for ductile metals. The phenomenological approach takes into account the effect of stress state on damage condition and damage strain evolution laws. Different branches of these criteria are considered corresponding to different damage and fracture mechanisms depending on stress triaxiality and the Lode parameter. To validate these criteria new experiments with two-dimensionally loaded specimens are presented. Specimen’s geometry and loading conditions as well as their influence on stress states are discussed in detail. They allow combined shear-tension and shear-compression stress states. Digital image correlation technique has been used to analyze current strain fields in critical regions of the specimens. Corresponding numerical simulations of the experiments show that they cover a wide range of stress states.