Steady-state crack growth and fracture work based on the theory of mechanism-based strain gradient plasticity

CORC > 力学研究所 > 中国科学院力学研究所 > 力学所知识产出(1956-2008)

	Steady-state crack growth and fracture work based on the theory of mechanism-based strain gradient plasticity
	Wei YG(魏悦广); Qiu X; Hwang KC
刊名	Engineering Fracture Mechanics
	2003
卷号	71 页码:107-125
ISSN号	0013-7944
通讯作者	Wei, Y (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
中文摘要	Mode I steady-state crack growth is analyzed under plane strain conditions in small scale yielding. The elastic-plastic solid is characterized by the mechanism-based strain gradient (MSG) plasticity theory [J. Mech. Phys. Solids 47 (1999) 1239, J. Mech. Phys. Solids 48 (2000) 99]. The distributions of the normal separation stress and the effective stress along the plane ahead of the crack tip are computed using a special finite element method based on the steady-state fundamental relations and the MSG flow theory. The results show that during the steady-state crack growth, the normal separation stress on the plane ahead of the crack tip can achieve considerably high value within the MSG strain gradient sensitive zone. The results also show that the crack tip fields are insensitive to the cell size parameter in the MSG theory. Moreover, in the present research, the steady-state fracture toughness is computed by adopting the embedded process zone (EPZ) model. The results display that the steady-state fracture toughness strongly depends on the separation strength parameter of the EPZ model and the length scale parameter in the MSG theory. Furthermore, in order for the results of steady crack growth to be comparable, an approximate relation between the length scale parameters in the MSG theory and in the Fleck-Hutchinson strain gradient plasticity theory is obtained.
学科主题	力学
类目[WOS]	Mechanics
研究领域[WOS]	Mechanics
关键词[WOS]	TIP FIELDS ; INTERFACE ADHESION ; MICRO-INDENTATION ; SINGLE-CRYSTALS ; 1ST PRINCIPLES ; SOLIDS ; RESISTANCE ; MODEL ; DELAMINATION ; DECOHESION
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000185968600006
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/311007/17667]
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,Qiu X,Hwang KC. Steady-state crack growth and fracture work based on the theory of mechanism-based strain gradient plasticity[J]. Engineering Fracture Mechanics,2003,71:107-125.
APA	魏悦广,Qiu X,&Hwang KC.(2003).Steady-state crack growth and fracture work based on the theory of mechanism-based strain gradient plasticity.Engineering Fracture Mechanics,71,107-125.
MLA	魏悦广,et al."Steady-state crack growth and fracture work based on the theory of mechanism-based strain gradient plasticity".Engineering Fracture Mechanics 71(2003):107-125.