Effects of indenter geometry and material properties on the correction factor of Sneddon’s relationship for nanoindentation of elastic and elastic–plastic materials

✍ Scribed by Zhi-Hui Xu; Xiaodong Li

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 796 KB
• Volume: 56
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2007.11.030

✦ Synopsis

Finite element simulations of indentations on elastic and elastic-plastic materials have been performed to systematically study the effects of indenter geometry and mechanical properties, namely Poisson's ratio and the E/r y ratio, on the correction factor for Sneddon's equation used for analysis of nanoindentation data. Two indenter geometries, namely conical and Berkovich indenters, have been considered. It has been shown that the first-order correction for conical indentation on elastic materials previously developed by Hay et al.

[Hay JC, Bolshakov A, Pharr GM. J Mater Res 1999;14:2296-305] can be applied only to conical indentation of elastic deformationdominated materials but not to Berkovich indentation. A new general relationship for the estimation of the correction factor for Berkovich indentation is proposed based on the finite element simulation results. This relationship gives a better estimation of correction factor for Berkovich indentations on both elastic and elastic-plastic materials.