Micro-bending tests: A comparison between three-dimensional discrete dislocation dynamics simulations and experiments

被引：132

作者：

Motz, C. ^{[1
,2
]}

Weygand, D. ^{[2
]}

Senger, J. ^{[2
]}

Gumbsch, P. ^{[2
]}

机构：

[1] Austrian Acad Sci, ESI, A-8700 Leoben, Austria

[2] Univ Karlsruhe TH, IZBS, D-76131 Karlsruhe, Germany

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 09期

基金：

奥地利科学基金会;

关键词：

bending test; dislocation dynamics; plastic deformation; strain gradient plasticity; copper;

D O I：

10.1016/j.actamat.2007.12.053

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Discrete dislocation dynamics simulations in three dimensions are performed on micro-sized bending beams and the results are compared with experiments. A strong size dependence of the flow stress sigma(r) (or bending moment) is found. The flow stress scales approximately inversely with the beam thickness t. The simulations show that the dislocation structure exhibits pronounced pile-ups around the neutral plane of the beam. The back stress from these pile-ups on the dislocation sources is analyzed by means of an analytical pile-up model. It is shown that the scaling behavior sigma(f) proportional to t(-1) can be explained by a combination of pile-up and source size limitation. Subsequently, the applicability of strain gradient plasticity models on micro-bending is discussed. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1942 / 1955

页数：14

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