The Flow Theory of Mechanism-Based Strain Gradient Plasticity

doi:10.1016/S0167-6636(02)00274-0

IMECH-IR > 力学所知识产出(1956-2008)

	The Flow Theory of Mechanism-Based Strain Gradient Plasticity
	Qiu X; Huang Y; Wei YG(魏悦广); Gao H; Hwang KC; Huang, Y (reprint author), Univ Illinois, Dept Mech & Ind Engn, 1206 W Green St, Urbana, IL 61801 USA.
发表期刊	Mechanics of Materials
	2003
卷号	35 页码:245-258
ISSN	0167-6636
摘要	The flow theory of mechanism-based strain gradient (MSG) plasticity is established in this paper following the same multiscale, hierarchical framework for the deformation theory of MSG plasticity in order to connect with the Taylor model in dislocation mechanics. We have used the flow theory of MSG plasticity to study micro-indentation hardness experiments. The difference between deformation and flow theories is vanishingly small, and both agree well with experimental hardness data. We have also used the flow theory of MSG plasticity to investigate stress fields around a stationary mode-I crack tip as well as around a steady state, quasi-statically growing crack tip. At a distance to crack tip much larger than dislocation spacings such that continuum plasticity still applies, the stress level around a stationary crack tip in MSG plasticity is significantly higher than that in classical plasticity. The same conclusion is also established for a steady state, quasi-statically growing crack tip, though only the flow theory can be used because of unloading during crack propagation. This significant stress increase due to strain gradient effect provides a means to explain the experimentally observed cleavage fracture in ductile materials [J. Mater. Res. 9 (1994) 1734, Scripta Metall. Mater. 31 (1994) 1037; Interface Sci. 3(1996) 169].
学科领域	力学
DOI	10.1016/S0167-6636(02)00274-0
收录类别	SCI
语种	英语
WOS记录号	WOS:000180597600007
关键词[WOS]	DISCRETE DISLOCATION ANALYSIS ; METAL-MATRIX COMPOSITES ; CRACK-GROWTH ; SINGLE-CRYSTALS ; THIN-FILMS ; HARDNESS TESTS ; SIZE ; INDENTATION ; LOCALIZATION ; FRACTURE
WOS研究方向	Materials Science ; Mechanics
WOS类目	Materials Science, Multidisciplinary ; Mechanics
引用统计	被引频次：73[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/311007/16278
专题	力学所知识产出(1956-2008)
通讯作者	Huang, Y (reprint author), Univ Illinois, Dept Mech & Ind Engn, 1206 W Green St, Urbana, IL 61801 USA.
推荐引用方式 GB/T 7714	Qiu X,Huang Y,Wei YG,et al. The Flow Theory of Mechanism-Based Strain Gradient Plasticity[J]. Mechanics of Materials,2003,35:245-258.
APA	Qiu X,Huang Y,魏悦广,Gao H,Hwang KC,&Huang, Y .(2003).The Flow Theory of Mechanism-Based Strain Gradient Plasticity.Mechanics of Materials,35,245-258.
MLA	Qiu X,et al."The Flow Theory of Mechanism-Based Strain Gradient Plasticity".Mechanics of Materials 35(2003):245-258.

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