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Displacement Modulation Based Dynamic Nanoindentation for Viscoelastic Material Characterization

Published online by Cambridge University Press:  01 February 2011

Sehaj P. Singh ,
Raman P. Singh  and
James F. Smith
Sehaj P. Singh
Affiliation:
Mechanics of Advanced Materials Laboratory, Department of Mechanical Engineering, Stony Brook University, Stony Brook, NY 11794–2300, USA.
Raman P. Singh
Affiliation:
Mechanics of Advanced Materials Laboratory, Department of Mechanical Engineering, Stony Brook University, Stony Brook, NY 11794–2300, USA.
James F. Smith
Affiliation:
Micro Materials Limited, Wrexham Technology Park, Wrexham LL13 7YP, UK.
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Abstract

This paper demonstrates a new displacement modulation technique for using a depth sensing nanoindentation instrument to measure the dynamic mechanical properties of viscoelastic materials. For testing low modulus, high damping polymeric materials, dynamic nanoindentation offers several advantages over quasi-static testing. In this research, a model for the dynamic response of the system is proposed and shown to match well with experimental observations. A new calibration procedure, which involves the use of a variable cantilever spring, is employed to determine the damping characteristics of the testing frame as a function of excitation frequency. Using the proposed procedure dynamic nanoindentation tests are carried out on a viscoelastic material to determine the storage and loss moduli as functions of excitation frequency. Finally, a comparison with results from conventional testing (DMA) is provided.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 841: Symposium R – Fundamentals of Nanoindentation and Nanotribology III , 2004 , R4.6
Copyright
Copyright © Materials Research Society 2005

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References

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