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Contact area determination in indentation testing of elastomers

Published online by Cambridge University Press:  31 January 2011

Julia K. Deuschle ,
H. Matthias Deuschle ,
Susan Enders  and
Eduard Arzt
Julia K. Deuschle*
Affiliation:
Max-Planck-Institute for Metals Research, Stuttgart, Baden Wuerttemberg 70569, Germany
H. Matthias Deuschle
Affiliation:
Institute of Statics and Dynamics of Aerospace Structures, University of Stuttgart, Stuttgart, Baden Wuerttemberg 70569, Germany
Susan Enders
Affiliation:
Max-Planck-Institute for Metals Research, Stuttgart, Baden Wuerttemberg 70569, Germany
Eduard Arzt
Affiliation:
Max-Planck-Institute for Metals Research, Stuttgart, Baden Wuerttemberg 70569, Germany
*
a) Address all correspondence to this author.e-mail: deuschle@mf.mpg.de
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Abstract

To evaluate mechanical properties by means of nanoindentation, information on the contact area is crucial. However, the contact area is not directly accessible in experiments and is usually calculated according to the Oliver and Pharr procedure, which turned out to be unsatisfying when applied to viscoelastic materials like polymers. In this study, complementary in situ indentation testing and finite element analysis (FEA) were performed on silicone elastomers. Through this combination of techniques, several individual error sources in the conventional contact area determination have been identified and quantified. For shallow penetrations, contact areas after Oliver and Pharr were up to 40% smaller than the in situ testing results; for larger penetrations, the contact size was overestimated by approximately 6%. The deviations of the resulting mechanical properties were approximately 10%. Viscoelastic effects could be captured if dynamic indentation testing was performed.

Keywords

NanoindentationPolymerSimulation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 736 - 748
Copyright
Copyright © Materials Research Society 2009

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References

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