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Multiple-frequency dynamic nanoindentation testing

Published online by Cambridge University Press:  01 October 2004

A.C. Fischer-Cripps
A.C. Fischer-Cripps*
Affiliation:
CSIRO, Division of Telecommunications and Industrial Physics, Lindfield NSW 2070, Australia
*
a) Address all correspondence to this author.e-mail: [email protected]
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Abstract

A new method of dynamic nanoindentation testing is introduced in this paper. Conventional dynamic nanoindentation testing involves the superposition of a single frequency sinusoidal force or displacement onto the quasi-static load–displacement curve. However, the viscoelastic response of many materials depends upon the frequency of the deformation of the material. This paper describes a method whereby the storage and loss modulus of viscoelastic solids can be determined using a multi-frequency dynamic oscillatory motion mode of deformation. In this method, the applied load is modulated by a pseudo-random force signal comprising multiple frequencies. A Fourier analysis is then used to deconvolute the signal into frequency-dependent values of storage and loss modulus for the specimen material as a function of frequency. The instrument response is cancelled by the use of a reference transfer function using an equalization process. Established modeling equations can then be used to extract the modulus of elasticity and the viscosity of the specimen material.

Keywords

NanoindentationHardnessMechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 10 , October 2004 , pp. 2981 - 2988
Copyright
Copyright © Materials Research Society 2004

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References

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