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Validity of the reduced modulus concept to describe indentation loading response for elastoplastic materials with sharp indenters

Published online by Cambridge University Press:  31 January 2011

In-suk Choi  and
Oliver Kraft and Ruth Schwaiger
In-suk Choi*
Affiliation:
Forschungszentrum Karlsruhe, Institute for Materials Research II, 76344 Karlsruhe, Germany
Oliver Kraft and Ruth Schwaiger
Affiliation:
Forschungszentrum Karlsruhe, Institute for Materials Research II, 76344 Karlsruhe, Germany; and Universität Karlsruhe, Institut für Zuverlässigkeit von Bauteilen und Systemen, 76131 Karlsruhe, Germany
*
a) Address all correspondence to this author. e-mail:In-suk.Choi@imf.fzk.de
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Abstract

Recent computational parametric studies have developed reverse algorithms to extract material properties of elastoplastic materials using experimental sharp nanoindentation. These methods used reduced modulus in their parameters to include the effect of indenter compliance. To investigate the validity of using reduced modulus, we conducted experimental indentation of a couple of representative cases for elastoplastic metals with a diamond and a sapphire Berkovich tip. Then, we performed a finite element study for sharp indentation of the same material systems. Both computational and experimental results indicate that the use of reduced modulus is invalid to describe indentation loading response for elastoplastic materials in a certain material regime. Our results show that indenter compliance is overestimated by the previous predictions using reduced modulus. This overestimation leads to underestimation of indenter curvature and causes error in extracting material properties by reverse algorithms.

Keywords

Nanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 998 - 1006
Copyright
Copyright © Materials Research Society 2009

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