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	Effects of specimen size and applied strain rate on the plastic flow of FCC metals
	Guo Yu ; Zhuang Zhuo ; Li Xiaoyan
	2010-05-07 ; 2010-05-07
关键词	Theoretical or Mathematical/ copper dislocation nucleation molecular dynamics method plastic flow stress-strain relations yield stress/ specimen size strain rate plastic flow FCC metals shear molecular dynamics simulation single-crystal copper blocks dislocation nucleation theory power law scaling behavior atomistic simulation plastic yield stress stress-strain curves Cu/ A6220F Deformation and plasticity A6185 Modelling and computer simulation of solid structure A6170G Dislocations: theory A8140L Deformation, plasticity and creep/ Cu/el
中文摘要	The simple shear molecular dynamics (MD) simulations are performed on single-crystal copper blocks to analyze the size and strain rate effects on face-centered cubic (FCC) metals. It is found 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 established to predict the scaling behavior of FCC metals, and it agrees well with the numerical and experimental data ranging all spatial domain from nano-scale to macro-scale. In the atomistic simulation at different applied strain rates, a critical strain rate exists for the single-crystal copper. Below it the yield stress is nearly insensitive to the strain rate, while above it the yield stress increases rapidly with increasing strain rate. Based on the results of the MD simulation, a strain rate model is introduced for the plastic yield stress of FCC metals at nano-scale.
语种	中文 ; 中文
出版者	Chinese J. Mech. Press ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/15814]
专题	清华大学
推荐引用方式 GB/T 7714	Guo Yu,Zhuang Zhuo,Li Xiaoyan. Effects of specimen size and applied strain rate on the plastic flow of FCC metals[J],2010, 2010.
APA	Guo Yu,Zhuang Zhuo,&Li Xiaoyan.(2010).Effects of specimen size and applied strain rate on the plastic flow of FCC metals..
MLA	Guo Yu,et al."Effects of specimen size and applied strain rate on the plastic flow of FCC metals".(2010).

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