Size effect on the compressive strength of hollow micropillars governed by wall thickness

被引：12
作者：
Fan, Haidong [1 ,2 ]
Li, Zhenhuan [1 ,2 ]
Huang, Minsheng [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Dept Mech, Wuhan 430074, Peoples R China
[2] Hubei Key Lab Engn Struct Anal & Safety Assessmen, Wuhan 430074, Peoples R China
来源：
SCRIPTA MATERIALIA | 2012年 / 67卷 / 03期
关键词：
Discrete dislocation dynamics; Hollow micropillar; Single-arm source model; Size effect; DISLOCATION; PLASTICITY; SCALE;
D O I：
10.1016/j.scriptamat.2012.04.012
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The compressive behavior of hollow micropillars is modeled by three-dimensional discrete dislocation dynamics (3D-DDD). Computational results show that wall thickness is the principal geometrical parameter governing the compressive strength of these micropillars, while inner or outer diameter has a weak influence. This is because the plastic behavior is dominated by the single-arm dislocation sources with statistical lengths determined by the wall thickness. The single-arm source model is further extended to quantitatively describe this thickness effect, showing good agreement with the present 3D-DDD results. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：225 / 228
页数：4
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