Stress state dependence of ductile damage and fracture behavior: Experiments and numerical simulations

• Stress state dependent ductile damage model.
• New experiments with biaxially loaded specimens.
• Various damage and fracture mechanisms pointed out by scanning electron microscope analyses.

The paper deals with new experiments and corresponding numerical simulations to study the effect of stress state on damage and fracture behavior of ductile metals. Different branches of ductile damage criteria are considered corresponding to various mechanisms depending on stress intensity, stress triaxiality and the Lode parameter. New experiments with two-dimensionally loaded specimens have been developed covering a wide range of stress triaxialities and Lode parameters in the tension, shear and compression domains. Scanning electron microscope (SEM) analyses of the fracture surfaces show various failure modes corresponding to different stress states detected by numerical simulations of the experiments.