Numerical and experimental indentation tests considering size effects

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:48

Article

Harsono, E.¹  Swaddiwudhipong, S.¹  Liu, Z. S.²  Shen, L.³ 

[1] Natl Univ Singapore, Dept Civil & Environm Engn, Singapore 117576, Singapore

[2] ASTAR, Inst High Performance Comp, Singapore 138632, Singapore

[3] ASTAR, Inst Mat Res & Engn, Singapore 117602, Singapore

关键词: Conventional mechanism based strain gradient plasticity;    Finite element method;    Indentation size effect;    Indentation test;    Simulated indentation;   

DOI  :  10.1016/j.ijsolstr.2010.12.002

来源: Elsevier

【 摘 要 】

A series of nanoindentation experiments with maximum depths varying from 1200 to 2500 nm were conducted to study indentation size effects on copper, aluminium alloy and nickel. As expected, results from classical plasticity simulation deviate significantly from experimental data for indentation at micron and submicron levels. C continuity finite element analysis incorporating the conventional theory of mechanism-based strain-gradient (CMSG) plasticity has been carried out to simulate spherical and Berkovich indentation tests at micron level where size effect is observed. The results from both numerical and actual spherical and Berkovich indentation tests demonstrate that materials are significantly strengthened for deformation at this level and the proposed approach is able to provide reasonably accurate results. (C) 2010 Elsevier Ltd. All rights reserved.

【 授权许可】

Free