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Atomistic and continuum studies of stress and strain fields near a rapidly propagating crack in a harmonic lattice

被引：39
作者：
Buehler, MJ
Gao, HJ
Huang, YG
机构：
[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany
[2] Univ Illinois, Dept Mech & Ind Engn, Urbana, IL 61801 USA
来源：
THEORETICAL AND APPLIED FRACTURE MECHANICS | 2004年 / 41卷 / 1-3期
关键词：
atomistic; continuum; asymptotic field; mode I fracture; harmonic lattice; stress; strain;
D O I：
10.1016/j.tafmec.2003.11.022
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 [机械工程];
摘要：
Large-scale atomistic simulations of a mode I crack propagating in a harmonic lattice are presented. The objective of this work is to study the stress and strain fields near a rapidly propagating mode I crack. The asymptotic continuum mechanics solutions of the elastic fields are compared quantitatively with molecular-dynamics simulation results for different crack velocities. It is observed that both atomistic stress and atomistic strain can be successfully related to the corresponding continuum quantities. The study reveals that the atomistic simulation results agree well with the continuum theory predictions, which suggests that the continuum theory can be applied for nano-scale dynamic problems. (C) 2003 Elsevier Ltd. All rights reserved.
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页码：21 / 42
页数：22
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