Lattice instability at a fast moving crack tip

doi:10.1063/1.363383

IMECH-IR > 力学所知识产出(1956-2008)

	Lattice instability at a fast moving crack tip
	Zhang YW(张永伟); Wang ZQ(王自强); Zhang, YW (reprint author), CHINESE ACAD SCI,INST MECH,LNM,BEIJING 100080,PEOPLES R CHINA.
发表期刊	Journal of Applied Physics
	1996
卷号	80 期号:8 页码:4332-4336
ISSN	0021-8979
摘要	A molecular dynamics method is used to analyze the dynamic propagation of an atomistic crack tip. The simulation shows that the crack propagates at a relatively constant global velocity which is well below the Rayleigh wave velocity. However the local propagation velocity oscillates violently, and it is limited by the longitudinal wave velocity. The crack velocity oscillation is caused by a repeated process of crack tip blunting and sharpening. When the crack tip opening displacement exceeds a certain critical value, a lattice instability takes place and results in dislocation emissions from the crack tip. Based on this concept, a criterion for dislocation emission from a moving crack tip is proposed. The simulation also identifies the emitted dislocation as a source for microcrack nucleation. A simple method is used to examine this nucleation process. (C) 1996 American Institute of Physics.
关键词	Molecular-dynamics Fracture Propagation Model Simulations Nucleation Surface
DOI	10.1063/1.363383
收录类别	SCI
语种	英语
WOS记录号	WOS:A1996VM27200013
关键词[WOS]	MOLECULAR-DYNAMICS ; FRACTURE ; PROPAGATION ; MODEL ; SIMULATIONS ; NUCLEATION ; SURFACE
WOS研究方向	Physics
WOS类目	Physics, Applied
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/39098
专题	力学所知识产出(1956-2008)
通讯作者	Zhang, YW (reprint author), CHINESE ACAD SCI,INST MECH,LNM,BEIJING 100080,PEOPLES R CHINA.
推荐引用方式 GB/T 7714	Zhang YW,Wang ZQ,Zhang, YW . Lattice instability at a fast moving crack tip[J]. Journal of Applied Physics,1996,80,8,:4332-4336.
APA	张永伟,王自强,&Zhang, YW .(1996).Lattice instability at a fast moving crack tip.Journal of Applied Physics,80(8),4332-4336.
MLA	张永伟,et al."Lattice instability at a fast moving crack tip".Journal of Applied Physics 80.8(1996):4332-4336.

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