Atomistic study of anisotropic effect on two-dimensional dynamic crack

We adopt molecular dynamics （MD） method to extensively study the dynamical process during the crack propagation along two crystallographic directions in the two-dimensional close-packed system. The dependence of crack initiation time on the loading rates is investigated in comparison with continuum...

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Bibliographic Details
Published in:Frontiers of materials science 2012-03, Vol.6 (1), p.87-96
Main Authors: Ren, Guo-Wu, Tang, Tie-Gang, Li, Qin-Zhong
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Materials Science
Research Article
二维
分子动力学
动力学过程
动态裂纹
原子
各向异性效应
扩展过程
裂纹尖端
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Summary:We adopt molecular dynamics （MD） method to extensively study the dynamical process during the crack propagation along two crystallographic directions in the two-dimensional close-packed system. The dependence of crack initiation time on the loading rates is investigated in comparison with continuum analysis. By calculating the displacement and stress field, the results are in excellent agreement with the asymptotic continuum solution of low-speed propagating crack. Moreover, the crack-tip velocity is numerically attained and associated with the instability of crack surface morphology, which results from the strongly anisotropic behavior. Further analysis remarkably observes the crack-branching healing process in that the dislocation emission absorbs the concentrated strain energy of crack tip.
ISSN:2095-025X
2095-0268
DOI:10.1007/s11706-012-0159-3