On the unstable stacking criterion for ideal and cracked copper-crystals

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	On the unstable stacking criterion for ideal and cracked copper-crystals
	Zhang YW(张永伟); Wang ZQ(王自强); Tang QH(汤奇恒); ZHANG, YW (reprint author), CHINESE ACAD SCI,INST MECH,LNM,BEIJING 100080,PEOPLES R CHINA.
发表期刊	Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties
	1995
卷号	72 期号:4 页码:881-889
ISSN	0141-8610
摘要	The unstable stacking criteria for an ideal copper crystal under homogeneous shearing and for a cracked copper crystal under pure mode II loading are analysed. For the ideal crystal under homogeneous shearing, the unstable stacking energy gamma(us) defined by Rice in 1992 results from shear with no relaxation in the direction normal to the slip plane. For the relaxed shear configuration, the critical condition for unstable stacking does not correspond to the relative displacement Delta = b(p)/2, where b(p) is the Burgers vector magnitude of the Shockley partial dislocation, but to the maximum shear stress. Based on this result, the unstable stacking energy Gamma(us) is defined for the relaxed lattice. For the cracked crystal under pure mode II loading, the dislocation configuration corresponding to Delta = b(p)/2 is a stable state and no instability occurs during the process of dislocation nucleation. The instability takes place at approximately Delta = 3b(p)/4. An unstable stacking energy Pi(us) is defined which corresponds to the unstable stacking state at which the dislocation emission takes place. A molecular dynamics method is applied to study this in an atomistic model and the results verify the analysis above.
关键词	Dislocation Nucleation Metals Tip
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:A1995TE28300005
关键词[WOS]	DISLOCATION NUCLEATION ; METALS ; TIP
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
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/311007/39180
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,Tang QH,et al. On the unstable stacking criterion for ideal and cracked copper-crystals[J]. Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties,1995,72,4,:881-889.
APA	Zhang YW,Wang ZQ,Tang QH,&ZHANG, YW .(1995).On the unstable stacking criterion for ideal and cracked copper-crystals.Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties,72(4),881-889.
MLA	Zhang YW,et al."On the unstable stacking criterion for ideal and cracked copper-crystals".Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties 72.4(1995):881-889.

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