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.

摘要

预测延展性金属的损伤演变是研究人员面临的最重要的挑战之一。大多数损伤模型分为微观损伤力学模型和连续损伤力学模型。在本文中，实现了 Lemaitre 延性损伤模型的完全耦合弹塑性损伤子程序。利用该模型，预测钢样品在剪切载荷下的损伤萌生、扩展和断裂，并与 GTN 和扩展 GTN (EGTN) 模型进行比较。比较表明，虽然EGTN模型比GTN显示出更真实的结果，但Lemaitre模型对剪切主导损伤演化具有更准确的预测。