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Extracting the elastic and viscoelastic properties of a polymeric film using a sharp indentation relaxation test

Published online by Cambridge University Press:  03 March 2011

C.Y. Zhang ,
Y.W. Zhang ,
K.Y. Zeng ,
L. Shen  and
Y.Y. Wang
C.Y. Zhang
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 119260
Y.W. Zhang*
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 119260
K.Y. Zeng
Affiliation:
Department of Mechanical Engineering, National University of Singapore, Singapore 119260
L. Shen
Affiliation:
Institute of Materials Research and Engineering, Singapore 117602
Y.Y. Wang
Affiliation:
Institute of High Performance Computing, Singapore 117528
*
a) Address all correspondence to this author. e-mail: msezyw@nus.edu.sg
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Abstract

A new approach is proposed to extract the elastic and viscoelastic properties of a polymeric film on a hard substrate using a sharp indentation relaxation test. In the theoretic formulation, a sharp indentation relaxation test on a film/substrate system was interpreted by its equivalent flat-ended punch indentation relaxation test. The radius of the equivalent flat-ended punch was determined by the residual depth of the sharp indentation. A semi-analytical solution for a flat-ended punch relaxation test was derived. Sharp indentation relaxation tests on a polymethyl methacrylate film and a polycarbonate film on a glass substrate were performed. The semi-analytical solution and the experimental results were used to extract the elastic-viscoelastic parameters of the films. The extracted elastic-viscoelastic parameters of both films were found to be in a good agreement with data sheets of the films. The proposed approach provides a simple and yet feasible way to extract “film-only” elastic and viscoelastic properties.

Keywords

FilmPolymerStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 12 , December 2006 , pp. 2991 - 3000
Copyright
Copyright © Materials Research Society 2006

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