A Multiscale Model for the Ductile Fracture of Crystalline Materials

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	A Multiscale Model for the Ductile Fracture of Crystalline Materials
	Wei YG(魏悦广); Xu GS
刊名	International Journal of Plasticity
	2005
通讯作者邮箱	ywei@lnm.imech.ac.cn
卷号	21 期号:11 页码:2123-2149
ISSN号	0749-6419
通讯作者	Wei, YG (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
中文摘要	In this paper, a multiscale model that combines both macroscopic and microscopic analyses is presented for describing the ductile fracture process of crystalline materials. In the macroscopic fracture analysis, the recently developed strain gradient plasticity theory is used to describe the fracture toughness, the shielding effects of plastic deformation on the crack growth, and the crack tip field through the use of an elastic core model. The crack tip field resulting from the macroscopic analysis using the strain gradient plasticity theory displayes the 1/2 singularity of stress within the strain gradient dominated region. In the microscopic fracture analysis, the discrete dislocation theory is used to describe the shielding effects of discrete dislocations on the crack growth. The result of the macroscopic analysis near the crack tip, i.e. a new K-field, is taken as the boundary condition for the microscopic fracture analysis. The equilibrium locations of the discrete dislocations around the crack and the shielding effects of the discrete dislocations on the crack growth at the microscale are calculated. The macroscopic fracture analysis and the microscopic fracture analysis are connected based on the elastic core model. Through a comparison of the shielding effects from plastic deformation and the discrete dislocations, the elastic core size is determined.
学科主题	力学
类目[WOS]	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
研究领域[WOS]	Engineering ; Materials Science ; Mechanics
关键词[WOS]	STRAIN GRADIENT PLASTICITY ; CRACK-TIP FIELDS ; DISLOCATION NUCLEATION ; LAYERED MATERIALS ; 1ST PRINCIPLES ; INTERFACE ; CLEAVAGE ; GROWTH ; BRITTLE ; MECHANICS
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000231103900006
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/311007/15518]
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	Wei YG,Xu GS. A Multiscale Model for the Ductile Fracture of Crystalline Materials[J]. International Journal of Plasticity,2005,21(11):2123-2149.
APA	魏悦广,&Xu GS.(2005).A Multiscale Model for the Ductile Fracture of Crystalline Materials.International Journal of Plasticity,21(11),2123-2149.
MLA	魏悦广,et al."A Multiscale Model for the Ductile Fracture of Crystalline Materials".International Journal of Plasticity 21.11(2005):2123-2149.