期刊
ENGINEERING FRACTURE MECHANICS
卷 271, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2022.108634
关键词
Ductile fracture; Damage; Lode parameter; Shear; Void mechanisms; CDM; Al6061-T6
类别
The model aims to reconcile the theoretical framework of continuum damage mechanics with specific mechanisms of ductile fracture, establishing correlations between void evolution and continuum scale physical quantities through micromechanical modeling. It also allows the derivation of the fracture locus for the whole range of stress triaxiality and reformulates unilateral conditions for ductile damage.
A model for plasticity and damage, developed in the context of continuum damage mechanics and consistent with micromechanisms of void nucleation, growth, and coalescence, is presented. The damage dissipation potential has been formulated specifically to account for different damage contributions due to intervoid necking, shearing, and sheeting under arbitrary stress states. The existence of a cut-off for the negative stress triaxiality was questioned and unilateral conditions for ductile damage have been reformulated accordingly, considering the combination of stress triaxiality and Lode parameter. The model allows the derivation, although in implicit form, of the fracture locus for the whole range of stress triaxiality. An example application to Al2024-T351 and Al6061-T6 is presented. The proposed formulation represents an attempt to reconcile CDM theoretical framework with the ductile fracture specific mechanisms and their sequential progression under general loading conditions, making advantages of micromechanical modeling to establish correlations between void evolution and continuum scale physical quantities. Finite element model implementation and plasticity model formulation will be discussed in a forthcoming companion paper.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据