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Nanoindentation Method for Determining the Initial Contact and Adhesion Characteristics of Soft Polydimethylsiloxane

Published online by Cambridge University Press:  01 August 2005

Yifang Cao ,
Dehua Yang  and
Wole Soboyejoy
Yifang Cao
Affiliation:
Princeton Institute for the Science and Technology of Materials (PRISM) and Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544
Dehua Yang
Affiliation:
Hysitron Inc., Minneapolis, Minnesota 55344
Wole Soboyejoy*
Affiliation:
Princeton Institute for the Science and Technology of Materials (PRISM) and Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544
*
a) Address all correspondence to this author. e-mail: soboyejo@princeton.edu
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Abstract

In this paper, we present a method for determining the initial contact point and nanoindentation load–indentation depth characteristics for soft materials. The method is applied to the prediction of the load–indentation depth characteristics of polydimethylsiloxane. It involves the combined use of Johnson–Kendall–Roberts and Maugis–Dugdale adhesion theories and nonlinear least squares fitting in the determination of the initial contact point, the transition parameter, and the contact radius at zero contact load. The elastic modulus and the work of adhesion are also extracted from the load–indentation depth curves.

Keywords

AdhesionNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 8 , August 2005 , pp. 2004 - 2011
Copyright
Copyright © Materials Research Society 2005

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