The size effect on void growth in ductile materials

被引:89
作者
Liu, B
Qiu, X
Huang, Y
Hwang, KC
Li, M
Liu, C
机构
[1] Univ Illinois, Dept Mech & Ind Engn, Urbana, IL 61801 USA
[2] Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China
[3] ALCOA, Alcoa Tech Ctr, Alcoa Ctr, PA 15069 USA
[4] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
voids; size effect; void growth rate; strain gradient plasticity; Taylor dislocation model;
D O I
10.1016/S0022-5096(03)00037-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have extended the Rice-Tracey model (J. Mech. Phys. Solids 17 (1969) 201) of void growth to account for the void size effect based on the Taylor dislocation model, and have found that small voids tend to grow slower than large voids. For a perfectly plastic solid, the void size effect comes into play through the ratio epsilonl/R-0, where I is the intrinsic material length on the order of microns, c the remote effective strain, and R-0 the void size. For micron-sized voids and small remote effective strain such that epsilonl/R-0 less than or equal to 0.02, the void size influences the void growth rate only at high stress triaxialities. However, for sub-micron-sized voids and relatively large effective strain such that epsilonl/R-0 > 0.2, the void size has a significant effect on the void growth rate at all levels of stress triaxiality. We have also obtained the asymptotic solutions of void growth rate at high stress triaxialities accounting for the void size effect. For epsilonl/R-0 > 0.2, the void growth rate scales with the square of mean stress, rather than the exponential function in the Rice-Tracey model (1969). The void size effect in a power-law hardening solid has also been studied. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1171 / 1187
页数:17
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