Shear band stability and uniform elongation of gradient structured material: Role of lateral constraint

被引：45

作者：

Wang, Yanfei ^{[1
]}

Huang, Chongxiang ^{[1
]}

Li, Zhongkai ^{[2
]}

Fang, Xiaotian ^{[2
]}

Wang, Mingsai ^{[1
]}

He, Qiong ^{[1
]}

Guo, Fengjiao ^{[1
]}

Zhu, Yuntian ^{[2
,3
]}

机构：

[1] Sichuan Univ, Sch Aeronaut & Astronaut, Chengdu 610065, Peoples R China

[2] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

[3] Nanjing Univ Sci & Technol, Nano & Heterogeneous Struct Mat Ctr, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China

来源：

EXTREME MECHANICS LETTERS | 2020年 / 37卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Gradient structure; Shear bands; Uniform elongation; Synergistic constraint; Heterostructure; TENSILE PROPERTIES; BACK STRESS; DUCTILITY; PLASTICITY; STRENGTH; NANOCRYSTALLINE; IMPROVEMENT;

D O I：

10.1016/j.eml.2020.100686

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Here we report a shear bands-dominated deformation principle for the gradient material composed of two nanostructured gradient layers (NGLs) and a coarse-grained (CG) interior. Multiple shear bands form in the NGL to accommodate the applied strain. The magnitude of uniform elongation depends on shear band stability, and shear band stability is determined by the intensity of constraint between NGL and CG interior. Specifically, the stronger the constraint, the denser and more stable the shear bands dispersed in the NGL, thereby leading to larger uniform elongation. This finding sheds insight into the theoretical basis of harnessing dispersed stable shear bands in heterostructures by optimizing microstructure architecture. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：6

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