Grain rotation dependent fracture toughness of nanocrystalline materials

被引：16
作者：
Liu, Yingguang [1 ]
Zhou, Jianqiu [1 ,2 ]
Shen, T. D. [3 ,4 ]
Hui, David [5 ]
机构：
[1] Nanjing Univ Technol, Dept Mech Engn, Nanjing 210009, Jiangsu, Peoples R China
[2] Wuhan Inst Technol, Dept Mech Engn, Wuhan 430070, Hubei, Peoples R China
[3] Nanjing Univ Technol, High Tech Res Inst, Nanjing 210009, Jiangsu, Peoples R China
[4] Nanjing Univ Technol, State Key Lab Mat Oriented Chem Engn, Nanjing 210009, Jiangsu, Peoples R China
[5] Univ New Orleans, Dept Mech Engn, New Orleans, LA 70148 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 25-26期
基金：
中国国家自然科学基金;
关键词：
Nanocrystalline materials; Rotational deformation; Crack intensity factors; Disclinations; MECHANICAL-BEHAVIOR; METALS; DEFORMATION;
D O I：
10.1016/j.msea.2011.06.035
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A grain size dependent theoretical model is developed to describe the effect of special rotational deformation (SRD) on crack growth in deformed nanocrystalline (nc) materials. The SRD is driven by the stress concentration near the crack tip, and it serves as a toughening mechanism by releases part of the local stresses. The dependence of critical crack intensity factors on grain size was calculated. It was demonstrated that the SRD leads to an increase of critical crack intensity factors by 10-50%. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：7684 / 7687
页数：4
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