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Indentation responses of time-dependent films on stiff substrates

Published online by Cambridge University Press:  03 March 2011

Michelle L. Oyen ,
Robert F. Cook ,
John A. Emerson  and
Neville R. Moody
Michelle L. Oyen*
Affiliation:
Department of Biophysical Sciences and Medical Physics, University of Minnesota, Minneapolis, Minnesota 55455
Robert F. Cook
Affiliation:
Materials Science and Engineering, University of Minnesota, Minneapolis, Minnesota 55455
John A. Emerson
Affiliation:
Sandia National Laboratories Albuquerque, New Mexico 87185
Neville R. Moody
Affiliation:
Sandia National Laboratories Livermore, California 94551
*
a) Address all correspondence to this author. e-mail: MichelleLOyen@aol.com
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Abstract

A viscous-elastic-plastic indentation model was extended to a thin-film system, including the effect of stiffening due to a substrate of greater modulus. The system model includes a total of five material parameters: three for the film response (modulus, hardness, and time constant), one for the substrate response (modulus), and one representing the length-scale associated with the film-substrate interface. The substrate influence is incorporated into the elastic response of the film through a depth-weighted elastic modulus (based on a series sum of film and substrate contributions). Constant loading- and unloading-rate depth-sensing indentation tests were performed on polymer films on glass or metal substrates. Evidence of substrate influence was examined by normalization of the load-displacement traces. Comparisons were made between the model and experiments for indentation tests at different peak load levels and with varying degrees of substrate influence. A single set of five parameters was sufficient to characterize and predict the experimental load-displacement data over a large range of peak load levels and corresponding degrees of substrate influence.

Keywords

PolymerThin filmMechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 8 , August 2004 , pp. 2487 - 2497
Copyright
Copyright © Materials Research Society 2004

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