Size Effect and Geometrical Effect of Solids in Micro-Indentation Test

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	Size Effect and Geometrical Effect of Solids in Micro-Indentation Test
	Wei YG(魏悦广); Wang XZ(王学峥); Zhao MH(赵满洪); Zheng ZM(郑哲敏); Bai YL(白以龙); Wei, YG (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
发表期刊	Acta Mechanica Sinica
	2003
卷号	19 期号:1 页码:59-70
ISSN	0567-7718
摘要	Micro-indentation tests at scales of the order of sub-micron show that the measured hardness increases strongly with decreasing indent depth or indent size, which is frequently referred to as the size effect. At the same time, at micron or sub-micron scale, another effect, which is referred to as the geometrical size effects such as crystal grain size effect, thin film thickness effect, etc., also influences the measured material hardness. However, the trends are at odds with the size-independence implied by the conventional elastic-plastic theory. In the present research, the strain gradient plasticity theory (Fleck and Hutchinson) is used to model the composition effects (size effect and geometrical effect) for polycrystal material and metal thin film/ceramic substrate systems when materials undergo micro-indenting. The phenomena of the "pile-up" and "sink-in" appeared in the indentation test for the polycrystal materials are also discussed. Meanwhile, the micro-indentation experiments for the polycrystal Al and for the Ti/Si_3N_4 thin film/substrate system are carried out. By comparing the theoretical predictions with experimental measurements, the values and the variation trends of the micro-scale parameter included in the strain gradient plasticity theory are predicted.
学科领域	力学
收录类别	SCI ; EI ; CSCD
语种	英语
WOS记录号	WOS:000181439700007
关键词[WOS]	STRAIN GRADIENT PLASTICITY ; CRACK-TIP FIELDS ; SINGLE-CRYSTALS ; HARDNESS ; WORK
WOS研究方向	Engineering ; Mechanics
WOS类目	Engineering, Mechanical ; Mechanics
引用统计	被引频次：13[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/311007/17451
专题	力学所知识产出(1956-2008)
通讯作者	Wei, YG (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Wei YG,Wang XZ,Zhao MH,et al. Size Effect and Geometrical Effect of Solids in Micro-Indentation Test[J]. Acta Mechanica Sinica,2003,19,1,:59-70.
APA	魏悦广,王学峥,赵满洪,郑哲敏,白以龙,&Wei, YG .(2003).Size Effect and Geometrical Effect of Solids in Micro-Indentation Test.Acta Mechanica Sinica,19(1),59-70.
MLA	魏悦广,et al."Size Effect and Geometrical Effect of Solids in Micro-Indentation Test".Acta Mechanica Sinica 19.1(2003):59-70.

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