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Surface detection in nanoindentation of soft polymers

Published online by Cambridge University Press:  31 January 2011

Julia Deuschle ,
Susan Enders  and
Eduard Arzt
Julia Deuschle
Affiliation:
Max Planck Institute (MPI) for Metals Research, Stuttgart 70569, Germany
Susan Enders*
Affiliation:
Max Planck Institute (MPI) for Metals Research, Stuttgart 70569, Germany
Eduard Arzt
Affiliation:
Max Planck Institute (MPI) for Metals Research, Stuttgart 70569, Germany
*
a)Address all correspondence to this author. e-mail: enders@mf.mpg.de
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Abstract

In this work, we performed nanoindentation studies on polymers with different moduli in the range of several millipascals up to several gigapascals. The focus was on the initial contact identification during indentation testing. Surface-detection methods using quasi-static loading as well as methods employing the dynamic forces associated with the continuous stiffness measurement technique were compared regarding their practicability and accuracy for the testing of polymeric materials. For the most compliant material with a modulus of 1 MPa, where contact identification is most critical, we used load-displacement curves obtained from finite element modeling analysis as a reference for the evaluation of experimental techniques. The results show how crucial the precise surface detection is for achieving accurate indentation results, especially for compliant materials. Further, we found that surface detection by means of dynamic testing provides mechanical-property values of higher accuracy for all polymers used in this study. This was due to smaller errors in surface detection, thus avoiding a significant underestimation of the contact area.

Keywords

Elastic propertiesHardnessPolymer
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 11 , November 2007 , pp. 3107 - 3119
Copyright
Copyright © Materials Research Society 2007

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