Abstract
The paper deals with a series of new experiments to study the effect of non-proportional loading paths on damage and fracture behavior of ductile metals. In this context, a thermodynamically consistent anisotropic continuum damage model is presented. It takes into account the effect of stress state on damage conditions as well as on the evolution of damage strains. Different branches of the damage criteria corresponding to various ductile damage and fracture mechanisms depending on stress state are considered. The two-dimensionally loaded X0-specimen covering a wide range of stress triaxialities and Lode parameters in the tension and shear stress domains is being used. These tests are driven under different non-proportional loading paths. The formation of strain fields of the specimens is recorded by digital image correlation technique. Furthermore, scanning electron microscope analysis of the fracture surfaces clearly shows various failure modes corresponding to these loading conditions.
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