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.
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This material is based upon work supported by the U. S. Army Research Laboratory and the U. S. Army Research Office under contract/grant number DAAD19-02-1-0332.
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Singh, S.P., Singh, R.P. & Smith, J.F. Displacement Modulation Based Dynamic Nanoindentation for Viscoelastic Material Characterization. MRS Online Proceedings Library 841, R4.6 (2004). https://doi.org/10.1557/PROC-841-R4.6