Three-dimensional dislocation dynamics simulation of the influence of sample size on the stress-strain behavior of fcc single-crystalline pillars

被引：48

作者：

Weygand, D. ^{[1
,2
]}

Poignant, M. ^{[1
]}

Gumbsch, P. ^{[1
,2
]}

Kraft, O. ^{[1
,3
]}

机构：

[1] Univ Karlsruhe, Inst Zuverlassigkeit Bauteilen & Syst, D-76131 Karlsruhe, Germany

[2] Fraunhofer Inst Werkstoffmech, D-79108 Freiburg, Germany

[3] Forschungszentrum Karlsruhe, Inst Mat Forsch IMF 2, Karlsruhe, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 483-84卷

关键词：

size effect; dislocation dynamics; micro-pillars;

D O I：

10.1016/j.msea.2006.09.183

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The size-dependent flow stress in uniformly loaded pillars has been modeled using a discrete dislocation dynamics tool. Starting from Frank-Read sources of given length and random orientation, the simulated flow stress at 0.15% plastic strain shows a clear size effect, similar to experimental findings for larger strains. The scattering of the simulated stress-strain curves decreases with increasing sample size, which reflects that plasticity of small scale samples is very sensitive to the underlying dislocation microstructure. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：188 / 190

页数：3

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