Dislocation theory of the fracture criterion for anisotropic solids

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	Dislocation theory of the fracture criterion for anisotropic solids
	Wang TC(王自强)
刊名	Philosophical Magazine A
	1998
卷号	77 期号:1 页码:31-53
ISSN号	0141-8610
通讯作者	Wang, TC (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
中文摘要	A dislocation theory of fracture criterion for the mixed dislocation emission and cleavage process in an anisotropic solid is developed in this paper. The complicated cases involving mixed-mode loading are considered here. The explicit formula for dislocations interaction with a semi-infinite crack is obtained. The governing equation for the critical condition of crack cleavage in an anisotropic solid after a number dislocation emissions is established. The effects of elastic anisotropy, crack geometry and load phase angle on the critical energy release rate and the total number of the emitted dislocations at the onset of cleavage are analysed in detail. The analyses revealed that the critical energy release rates can increase to one or two magnitudes larger than the surface energy because of the dislocation emission. It is also found elastic anisotropy and crystal orientation have significant effects on the critical energy release rates. The anisotropic values can be several times the isotropic value in one crack orientation. The values may be as much as 40% less than the isotropic value in another crack orientation and another anisotropy parameter. Then the theory is applied to a fee single crystal. An edge dislocation can emit from the crack tip along the most highly shear stressed slip plane. Crack cleavage can occur along the most highly stressed slip plane after a number of dislocation emissions. Calculation is carried out step by step. Each step we should judge by which slip system is the most highly shear stressed slip system and which slip system has the largest energy release rate. The calculation clearly shows that the crack orientation and the load phase angle have significant effects on the crystal brittle-ductile behaviours.
学科主题	力学
类目[WOS]	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
研究领域[WOS]	Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
收录类别	SCI
原文出处	http://dx.doi.org/10.1080/01418619808214229
语种	英语
WOS记录号	WOS:000071592400003
公开日期	2007-06-15 ; 2007-12-05 ; 2009-06-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/15813]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Wang TC. Dislocation theory of the fracture criterion for anisotropic solids[J]. Philosophical Magazine A,1998,77(1):31-53.
APA	Wang TC.(1998).Dislocation theory of the fracture criterion for anisotropic solids.Philosophical Magazine A,77(1),31-53.
MLA	Wang TC."Dislocation theory of the fracture criterion for anisotropic solids".Philosophical Magazine A 77.1(1998):31-53.