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	Constitutive modeling for nanocrystalline metals based on cooperative grain boundary mechanisms
	Hong-Tao Wang ; Wei Yang
	2010-05-07 ; 2010-05-07
关键词	Theoretical or Mathematical/ grain boundaries internal stresses metal clusters nanostructured materials plastic deformation slip/ constitutive modeling nanocrystalline metals cooperative grain boundary mechanisms plastic deformation deformation model incorporation Ashby-Verrall mechanism rotation processes plane strain insertion processes three-dimensional constitutive relations stress state orientation evolution grain clusters microscopic energy dissipation Hashin-Shtrikman bounds/ A6170N Grain and twin boundaries A6220F Deformation and plasticity A8140L Deformation, plasticity and creep A6146 Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials A6185 Modelling and computer simulation of solid structure A6170L Slip, creep, internal friction and other indirect evidence of dislocations A6480G Microstructure
中文摘要	In nanocrystalline metals, the plastic deformation is accommodated primarily at the grain boundaries. Yang and Wang suggested a deformation model based on clusters consisting of nine grains and incorporating both the Ashby-Verrall mechanism and a 30 degrees rotation of closely linked pairs of grains. In the present article, the insertion and rotation processes are considered together as a cooperative deformation mechanisms, and the degree to which each process contributes is determined by the application of the principle of maximum plastic work. Plane strain and three-dimensional constitutive relations based on this concept are derived for which a general stress state drives the orientation evolution of various grain clusters under the Reuss assumption. Detailed calculation shows that the strain rate depends linearly on the stress, with the values of the coefficients in this linear relationship dictated by the microscopic energy dissipation. The deformation contributed to the overall response by the grain boundary mechanism is discussed in the spirit of the Hashin-Shtrikman bounds.
语种	英语 ; 英语
出版者	Elsevier ; UK
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/16285]
专题	清华大学
推荐引用方式 GB/T 7714	Hong-Tao Wang,Wei Yang. Constitutive modeling for nanocrystalline metals based on cooperative grain boundary mechanisms[J],2010, 2010.
APA	Hong-Tao Wang,&Wei Yang.(2010).Constitutive modeling for nanocrystalline metals based on cooperative grain boundary mechanisms..
MLA	Hong-Tao Wang,et al."Constitutive modeling for nanocrystalline metals based on cooperative grain boundary mechanisms".(2010).

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