An assessment of isotropic constitutive models for ductile fracture under high and low stress triaxiality

In this contribution, a numerical assessment of three isotropic constitutive models is performed in order to identify their applicability and reliability in the prediction of ductile failure under a wide range of stress triaxiality. The well established isotropic coupled damage models proposed by Gurson–Tvergaard–Needleman (GTN), which is based on micromechanical grounds and here extended with a shear mechanism, and by Lemaitre, which is based...