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	An investigation of the combined size and rate effects on the mechanical responses of FCC metals
	Guo, Y. ; Zhuang, Z. ; Li, X. Y. ; Chen, Z.
	2010-05-07 ; 2010-05-07
关键词	multi-scale size effect rate effect FCC metals STRAIN-GRADIENT PLASTICITY LENGTH SCALE EPITAXIAL MULTILAYERS SINGLE-CRYSTALS THIN-FILMS DEFORMATION COPPER SIMULATIONS DYNAMICS BEHAVIOR Mechanics
中文摘要	The molecular dynamics (MD) simulations are performed with single-crystal copper blocks under simple shear to investigate the size and strain rate effects on the mechanical responses of face-centered cubic (fec) metals. It is shown that the yield stress decreases with the specimen size and increases with the strain rate. Based on the theory of dislocation nucleation, a modified power law is proposed to predict the scaled behavior of fee metals, which agrees well with the numerical and experimental data ranging from nanoscale to macro-scale. In the MD simulations with different strain rates, a critical strain rate exists for each single-crystal copper block of given size, below which the yield stress is nearly insensitive to the strain rate. A hyper-surface is therefore formulated to describe the combined size and strain rate effects on the plastic yield strength of fee metals. The preliminary results presented in this paper demonstrate the potential of the proposed simple procedure for engineering design at various spatial and temporal scales. (c) 2006 Elsevier Ltd. All rights reserved.
语种	英语 ; 英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD ; OXFORD ; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/15974]
专题	清华大学
推荐引用方式 GB/T 7714	Guo, Y.,Zhuang, Z.,Li, X. Y.,et al. An investigation of the combined size and rate effects on the mechanical responses of FCC metals[J],2010, 2010.
APA	Guo, Y.,Zhuang, Z.,Li, X. Y.,&Chen, Z..(2010).An investigation of the combined size and rate effects on the mechanical responses of FCC metals..
MLA	Guo, Y.,et al."An investigation of the combined size and rate effects on the mechanical responses of FCC metals".(2010).

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