This paper develops a Constitutive Driver to assess the performance of cohesive-frictional material models and their localization properties. To this end, the graphics-oriented software package evaluates the response for triaxial input histories that may be specifiedin terms of tensor-valued strain, stress or mixed controls. Aside from providing important insight into the stress-strain behavior of multiple dissipation mechanisms, the main focus of the Constitutive Driver is to evaluate localized failure modes at the material level. The assessment of localization properties requires searching for spatial discontinuities that may develop in the course of the nonlinear and path-dependent response history. For visualization the localization conditions is displayed in terms of a Mohr-type envelope that detects onset and orientation of discontinuous failure modes when a failure critical stress state is reached.
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