Prediction of damage evolution behavior in ductile metals by Lemaitre criterion and comparison with GTN and EGTN damage models

Abstract

Prediction of damage evolution in ductile metals is among the most important challenges ahead of researchers. Most of damage models are divided into micromechanical and continuum damage mechanics models. In this paper, a fully coupled elastic-plastic-damage subroutine of Lemaitre’s ductile damage model is implemented. Employing the model, damage initiation, propagation, and fracture of steel samples under shear loadings are predicted and compared with the GTN and extended GTN (EGTN) models. The comparison reveals that although the EGTN model shows more realistic results rather than the GTN, but the Lemaitre’s model has a more accurate prediction for shear dominant damage evolution. © 2021 Taylor & Francis Group, LLC.