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Using multidimensional contact mechanics experiments to measure Poisson's ratio

Published online by Cambridge University Press:  03 March 2011

B.N. Lucas ,
J.C. Hay  and
W.C. Oliver
B.N. Lucas
Affiliation:
Fast Forward Devices, LLC, Knoxville, Tennessee 37931
J.C. Hay
Affiliation:
Fast Forward Devices, LLC, Knoxville, Tennessee 37931
W.C. Oliver
Affiliation:
MTS Nano Instruments Innovation Center, Oak Ridge, Tennessee 37830
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Abstract

Using a new multidimensional contact mechanics system, the normal and tangential elastic contact stiffnesses of six bulk materials with Poisson’s ratios ranging from 0.17 to 0.42 were measured. It is shown that the experimentally measured tangential to normal stiffness ratio can be described as a function of the bulk Poisson’s ratio of the material as predicted by Mindlin. The technique shows a high sensitivity to variations in Poisson’s ratio, suggesting that the technique is a viable means for measuring the Poisson’s ratio of new novel materials. The technique was subsequently applied to two metal film–glass substrate systems. Experimental observations indicate that even when Poisson’s ratio mismatch between the film and the substrate is large, the technique yields appropriate bulk values for the Poisson’s ratio of the film. The experimental details and apparatus are introduced and described.

Keywords

Mechanical propertiesThin filmIndentation
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 1 , January 2004 , pp. 58 - 65
Copyright
Copyright © Materials Research Society 2004

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References

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