期刊
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
卷 332, 期 -, 页码 644-685出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2017.12.027
关键词
Gradient-enhanced damage; Anisotropic damage; Quasi-brittle failure; Transient length scale
Two anisotropic stress-based gradient-enhanced damage models are proposed to address the issue of spurious damage growth typical of continuous standard gradient-enhanced damage models. Both models are based on a decreasing interaction length upon decreasing stresses and do not require additional model parameters or extra degrees of freedom when compared to standard gradient-enhanced models. It is observed that with the proposed models damage spreading is significantly reduced due to the occurrence of non-physical oscillations in the nonlocal strain field near the strain localization band. Model improvements to eliminate these strain oscillations upon vanishing length scale values are proposed. The capability of the models and their patched versions to correctly simulate damage initiation and propagation is investigated by means of mode-I failure, shear band and fourpoint bending tests. (C) 2018 Elsevier B.V. All rights reserved.
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