| Strain gradient plasticity in gradient structured metals | |
| Zhang, Yin1; Cheng, Zhao2; Lu, Lei2; Zhu, Ting1 | |
| Corresponding Author | Zhu, Ting(ting.zhu@me.gatech.edu) |
| 2020-07-01 | |
| Source Publication | JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
 |
| ISSN | 0022-5096 |
| Volume | 140Pages:15 |
| Abstract | 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. |
| Funding Organization | National Science Foundation of China ; Key Research Program of Frontier Science, CAS |
| DOI | 10.1016/j.jmps.2020.103946 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Materials Science ; Mechanics ; Physics |
| WOS Subject | Materials Science, Multidisciplinary ; Mechanics ; Physics, Condensed Matter |
| WOS ID | WOS:000530033800005 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/138643 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Zhu, Ting |
| Affiliation | 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 |
| Recommended Citation 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. |
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