A rate-dependent cohesive continuum model for the study of crack dynamics

被引：15
|
作者：
Nguyen, TD [1 ]
Govindjee, S
Klein, PA
Gao, H
机构：
[1] Stanford Univ, Dept Mech Engn, Div Mech & Computat, Stanford, CA 94305 USA
[2] Univ Calif Berkeley, Dept Civil Engn, Berkeley, CA 94720 USA
[3] Sandia Natl Labs, Sci Based Mat Modeling Dept, Livermore, CA 94551 USA
[4] Max Planck Inst Met Phys, Dept Theory Mesoscop Phenomena, D-70569 Stuttgart, Germany
来源：
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING | 2004年 / 193卷 / 30-32期
基金：
美国国家科学基金会; 中国国家自然科学基金;
关键词：
dynamic fracture; nonlinear viscoelasticity; cohesive model; crack propagation; internal bond model;
D O I：
10.1016/j.cma.2003.09.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A rate-dependent cohesive continuum model is developed to represent material particles interacting in a viscous medium. Interactions between material particles are modeled using a cohesive force law while microstructural resistance to relaxation is represented by a phenomenological continuum viscosity function. The model exhibits two failure mechanisms, elastic bond breaking and viscous weakening, which combine to induce rate dependence in the cohesive strength, fracture energy, and cohesive state wave speed. The model is used to simulate dynamic crack propagation. Results display rate-dependent terminal speeds which correspond to the cohesive strength and not to the local driving force; thus supporting the local limiting speed hypothesis. (C) 2004 Elsevier B.V. All rights reserved.
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页码：3239 / 3265
页数：27
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