Experiments on Damage and Failure Mechanisms in Ductile Metals at Different Loading Conditions

Abstract

This paper deals with a phenomenological damage and failure model for ductile metals. The anisotropic continuum approach takes into account the effect of stress state on damage condition and damage rule corresponding to different mechanisms acting on the micro-scale. Different branches of the criteria are formulated depending on stress intensity, stress triaxiality, and the Lode parameter. A new experimental program will be discussed in detail to validate the proposed continuum framework. Experiments with aluminum alloys are performed using a biaxial testing machine allowing individual loading of flat specimens in two directions. Loads are recorded during loading of the specimens and digital image correlation technique has been used to analyze the strain states in critical regions of the specimens. The biaxial experiments cover a wide range of stress states in shear-tension and shear-compression regimes. They will extend understanding of stress-state-dependent damage and failure mechanisms in ductile metals.