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	A NUMERICAL STUDY OF INDENTATION WITH SMALL SPHERICAL INDENTERS
	Qin, Jiang ; Qu, Shaoxing ; Feng, Xue ; Huang, Yonggang ; Xiao, Jianliang ; Hwang, Keh-Chih
	2010-10-12 ; 2010-10-12
关键词	indentation size effect spherical indenters geometrically necessary dislocations maximum density STRAIN GRADIENT PLASTICITY POLYCRYSTAL PLASTICITY MECHANICAL THRESHOLD CONVENTIONAL THEORY NANO-INDENTATION TIP RADIUS MODEL DEFORMATION HARDNESS MICROINDENTATION Materials Science, Multidisciplinary Mechanics
中文摘要	The finite element method for the conventional theory of mechanism-based strain gradient plasticity is used to study the indentation size effect. For small indenters (e.g., radii on the order of 10 mu m), the maximum allowable geometrically necessary dislocation (GND) density is introduced to cap the GND density such that the latter does not become unrealistically high. The numerical results agree well with the indentation hardness data of iridium. The GND density is much larger than the density of statistically stored dislocations (SSD) underneath the indenter, but this trend reverses away from the indenter. As the indentation depth (or equivalently, contact radius) increases, the GND density decreases but the SSD density increases.
语种	英语 ; 英语
出版者	SPRINGER HEIDELBERG ; HEIDELBERG ; TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79179]
专题	清华大学
推荐引用方式 GB/T 7714	Qin, Jiang,Qu, Shaoxing,Feng, Xue,et al. A NUMERICAL STUDY OF INDENTATION WITH SMALL SPHERICAL INDENTERS[J],2010, 2010.
APA	Qin, Jiang,Qu, Shaoxing,Feng, Xue,Huang, Yonggang,Xiao, Jianliang,&Hwang, Keh-Chih.(2010).A NUMERICAL STUDY OF INDENTATION WITH SMALL SPHERICAL INDENTERS..
MLA	Qin, Jiang,et al."A NUMERICAL STUDY OF INDENTATION WITH SMALL SPHERICAL INDENTERS".(2010).

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