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Nanoindentation of Poly (Methyl Methacrylate)

Published online by Cambridge University Press:  17 March 2011

Michael J. Adams ,
David M. Gorman  and
Simon A. Johnson
Michael J. Adams
Affiliation:
Unilever Research Port Sunlight, Bebington, Wirral, CH63 3JW, U.K.
David M. Gorman
Affiliation:
Unilever Research Port Sunlight, Bebington, Wirral, CH63 3JW, U.K.
Simon A. Johnson
Affiliation:
Unilever Research Port Sunlight, Bebington, Wirral, CH63 3JW, U.K.
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Abstract

For the indentation of an elastic-plastic homogeneous half-space with a pyramidal indenter, the load theoretically increases with the square of the total penetration depth. Experimental data are presented in the current paper that demonstrate the validity of this relationship for an organic polymer and a Berkovich indenter, provided that appropriate account is taken of the tip defect and viscoplasticity. It is also shown that a simple analytical solution exists for the ratio of the contact depth to the total penetration depth. These findings assist in identifying procedures for obtaining the rate-dependent mechanical properties of thin polymer coatings or polymeric materials with depth-dependent mechanical properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 649: Symposium Q – Fundamentals of Nanoindentation & Nanotribology II , 2000 , Q7.10
Copyright
Copyright © Materials Research Society 2001

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References

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