Strain gradient plasticity in gradient structured metals

doi:10.1016/j.jmps.2020.103946

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	Strain gradient plasticity in gradient structured metals
	Zhang, Yin 1; Cheng, Zhao 2; Lu, Lei 2; Zhu, Ting 1
刊名	JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
	2020-07-01
卷号	140 页码:15
ISSN号	0022-5096
DOI	10.1016/j.jmps.2020.103946
通讯作者	Zhu, Ting(ting.zhu@me.gatech.edu)
英文摘要	Structural gradients in metallic materials can give rise to substantial extra strengths compared to their non-gradient counterparts. This strengthening effect originates from the plastic strain gradients arising in plastically deformed gradient structures. Here we develop a gradient theory of plasticity by incorporating the strengthening effect of plastic strain gradients into the classical J(2) flow theory. This gradient theory is numerically implemented to study the strain gradient plasticity in gradient nanotwinned (GNT) Cu with different twin thickness gradients and accordingly different built-in strength gradients. Numerical simulations reveal the primary features of gradient plasticity in GNT Cu under uniaxial tension, including progressive yielding, gradient distributions of plastic strain and extra plastic flow resistance. The combined simulation and experimental results show that the extra strength of GNT Cu depends on the square root of the built-in strength gradient and also on the square root of the saturated plastic strain gradient in fully yielded GNT samples. This finding enables the predictions of optimal gradient structures and associated gradient strength distributions, which suggest possible routes for achieving the maximum strength of GNT Cu. (C) 2020 Elsevier Ltd. All rights reserved.
资助项目	National Science Foundation of China[51420105001] ; National Science Foundation of China[51471172] ; National Science Foundation of China[51931010 andU1608257] ; Key Research Program of Frontier Science, CAS
WOS研究方向	Materials Science ; Mechanics ; Physics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000530033800005
资助机构	National Science Foundation of China ; Key Research Program of Frontier Science, CAS
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/138642]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhu, Ting
作者单位	1.Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yin,Cheng, Zhao,Lu, Lei,et al. Strain gradient plasticity in gradient structured metals[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,2020,140:15.
APA	Zhang, Yin,Cheng, Zhao,Lu, Lei,&Zhu, Ting.(2020).Strain gradient plasticity in gradient structured metals.JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,140,15.
MLA	Zhang, Yin,et al."Strain gradient plasticity in gradient structured metals".JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 140(2020):15.