Nano Archive

Effects of Crystalline Anisotropy and Indenter Size on Nanoindentation by Multiscale Simulation

Li, Junwan and Ni, Yushan and Wang, Hongsheng and Mei, Jifa (2009) Effects of Crystalline Anisotropy and Indenter Size on Nanoindentation by Multiscale Simulation. Nanoscale Research Letters, 5 (2). pp. 420-432.

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Official URL: http://www.springerlink.com/content/xq182252j6217p...

Abstract

Nanoindentation processes in single crystal Ag thin film under different crystallographic orientations and various indenter widths are simulated by the quasicontinuum method. The nanoindentation deformation processes under influences of crystalline anisotropy and indenter size are investigated about hardness, load distribution, critical load for first dislocation emission and strain energy under the indenter. The simulation results are compared with previous experimental results and Rice-Thomson (R-T) dislocation model solution. It is shown that entirely different dislocation activities are presented under the effect of crystalline anisotropy during nanoindentation. The sharp load drops in the load–displacement curves are caused by the different dislocation activities. Both crystalline anisotropy and indenter size are found to have distinct effect on hardness, contact stress distribution, critical load for first dislocation emission and strain energy under the indenter. The above quantities are decreased at the indenter into Ag thin film along the crystal orientation with more favorable slip directions that easy trigger slip systems; whereas those will increase at the indenter into Ag thin film along the crystal orientation with less or without favorable slip directions that hard trigger slip systems. The results are shown to be in good agreement with experimental results and R-T dislocation model solution.

Item Type:Article
Uncontrolled Keywords:Multiscale - Quasicontinuum method - Nanoindentation - Anisotropy - Size effect
Subjects:Physical Science > Nanophysics
Engineering > Nanotechnology applications in mechanical engineering
Analytical Science > Metrology and standards in nanotechnology
Divisions:Faculty of Law, Arts and Social Sciences > School of Management
ID Code:8144
Deposited By:Lesley Tobin
Deposited On:22 Mar 2010 15:41
Last Modified:22 Mar 2010 15:41

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