Spherical Indentation on an Elastic Coating/Substrate System: Determining Substrate Modulus
Publication: Journal of Engineering Mechanics
Volume 135, Issue 10
Abstract
A vast amount of indentation studies on coating/substrate systems focused on extracting the mechanical properties of the film, by either avoiding or subtracting off the substrate effect. However, in engineering and biomedical applications, very often the substrate properties, in particular the substrate modulus, need to be measured from an indentation test and the protective layer cannot be removed. For the model system of an elastic film deposited on an elastic substrate, we establish the general approach of spherical indentation focusing on the substrate property determination. Indentation data are taken from different indentation depths which reflect different degrees of film and substrate effects. An effective reverse analysis algorithm is established such that, from an indentation test if either the film modulus or film thickness is known, the other variable can be measured along with the substrate modulus. Error sensitivity of the proposed formulation is analyzed in a systematic way.
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Acknowledgments
The work is supported in part by the National Science Foundation under Grant Nos. NSFCMS-0407743 and NSFCMMI-0643726, and in part by the Department of Civil Engineering and Engineering Mechanics, Columbia University.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 135 • Issue 10 • October 2009
Pages: 1189 - 1197
Copyright
© 2009 ASCE.
History
Received: Jul 1, 2008
Accepted: Feb 9, 2009
Published online: Mar 6, 2009
Published in print: Oct 2009
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