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
相关论文
共 20 条
  • [1] The role of the weakest-link mechanism in controlling the plasticity of micropillars
    El-Awady, Jaafar A.
    Wen, Ming
    Ghoniem, Nasf M.
    [J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 2009, 57 (01) : 32 - 50
  • [2] Fan H., 2012, SCRIPTA MAT
  • [3] GERHARD D, 2009, PROG MATER SCI, V54, P664
  • [4] Green JA, 2006, ARTHRITIS RHEUM-US, V54, P1705, DOI [10.1002/art.21799, 10.1016/j.actamat.2005.12.004]
  • [5] Plasticity in small-sized metallic systems: Intrinsic versus extrinsic size effect
    Greer, Julia R.
    De Hosson, Jeff Th. M.
    [J]. PROGRESS IN MATERIALS SCIENCE, 2011, 56 (06) : 654 - 724
  • [6] Size effects in Al nanopillars: Single crystalline vs. bicrystalline
    Kunz, Allison
    Pathak, Siddhartha
    Greer, Julia R.
    [J]. ACTA MATERIALIA, 2011, 59 (11) : 4416 - 4424
  • [7] Breakdown of Schmid's law in micropillars
    Ng, K. S.
    Ngan, A. H. W.
    [J]. SCRIPTA MATERIALIA, 2008, 59 (07) : 796 - 799
  • [8] An explanation for the power-law scaling of size effect on strength in micro-specimens
    Ngan, A. H. W.
    [J]. SCRIPTA MATERIALIA, 2011, 65 (11) : 978 - 981
  • [9] Dislocation structures and their relationship to strength in deformed nickel microcrystals
    Norfleet, D. M.
    Dimiduk, D. M.
    Polasik, S. J.
    Uchic, M. D.
    Mills, M. J.
    [J]. ACTA MATERIALIA, 2008, 56 (13) : 2988 - 3001
  • [10] Contribution to size effect of yield strength from the stochastics of dislocation source lengths in finite samples
    Parthasarathy, Triplicane A.
    Rao, Satish I.
    Dimiduk, Dennis M.
    Uchic, Michael D.
    Trinkle, Dallas R.
    [J]. SCRIPTA MATERIALIA, 2007, 56 (04) : 313 - 316
12