Mode I and Mode II Crack Tip Asymptotic Fields with Strain Gradient Effects

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	Mode I and Mode II Crack Tip Asymptotic Fields with Strain Gradient Effects
	Chen SH(陈少华); Wang ZQ(王自强); Chen, SH (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
发表期刊	Acta Mechanica Sinica
	2001
卷号	17 期号:3 页码:269-280
ISSN	0567-7718
摘要	The strain gradient effect becomes significant when the size of fracture process zone around a crack tip is comparable to the intrinsic material length l, typically of the order of microns. Using the new strain gradient deformation theory given by Chen and Wang, the asymptotic fields near a crack tip in an elastic-plastic material with strain gradient effects are investigated. It is established that the dominant strain field is irrotational. For mode I plane stress crack tip asymptotic field, the stress asymptotic field and the couple stress asymptotic field can not exist simultaneously. In the stress dominated asymptotic field, the angular distributions of stresses are consistent with the classical plane stress HRR field; In the couple stress dominated asymptotic field, the angular distributions of couple stresses are consistent with that obtained by Huang et al. For mode II plane stress and plane strain crack tip asymptotic fields, only the stress-dominated asymptotic fields exist. The couple stress asymptotic field is less singular than the stress asymptotic fields. The stress asymptotic fields are the same as mode II plane stress and plane strain HRR fields, respectively. The increase in stresses is not observed in strain gradient plasticity for mode I and mode II, because the present theory is based only on the rotational gradient of deformation and the crack tip asymptotic fields are irrotational and dominated by the stretching gradient.
学科领域	力学
收录类别	SCI ; EI ; CSCD
语种	英语
WOS记录号	WOS:000170649600008
关键词[WOS]	PLASTICITY ; INDENTATION ; POLYCRYSTALS ; HARDNESS ; WORK ; LAW
WOS研究方向	Engineering ; Mechanics
WOS类目	Engineering, Mechanical ; Mechanics
引用统计	被引频次：5[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/311007/17189
专题	力学所知识产出(1956-2008)
通讯作者	Chen, SH (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Chen SH,Wang ZQ,Chen, SH . Mode I and Mode II Crack Tip Asymptotic Fields with Strain Gradient Effects[J]. Acta Mechanica Sinica,2001,17,3,:269-280.
APA	陈少华,王自强,&Chen, SH .(2001).Mode I and Mode II Crack Tip Asymptotic Fields with Strain Gradient Effects.Acta Mechanica Sinica,17(3),269-280.
MLA	陈少华,et al."Mode I and Mode II Crack Tip Asymptotic Fields with Strain Gradient Effects".Acta Mechanica Sinica 17.3(2001):269-280.

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