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Title:
Steady-state crack growth and fracture work based on the theory of mechanism-based strain gradient plasticity
Author: Wei YG(魏悦广); Qiu X; Hwang KC
Source: Engineering Fracture Mechanics
Issued Date: 2003
Volume: 71, Pages:107-125
Abstract: 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.
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Wei, Y (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
DOI: 10.1016/S0013-7944(03)00065-1
DOC Type: Article
WOS Subject: Mechanics
WOS Subject Extended: Mechanics
WOS Keyword Plus: TIP FIELDS ; INTERFACE ADHESION ; MICRO-INDENTATION ; SINGLE-CRYSTALS ; 1ST PRINCIPLES ; SOLIDS ; RESISTANCE ; MODEL ; DELAMINATION ; DECOHESION
WOS ID: WOS:000185968600006
ISSN: 0013-7944
Subject: 力学
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/17667
Appears in Collections:力学所知识产出(1956-2008)_期刊论文

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Recommended Citation:
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,2003-01-01,71:107-125.
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