Compliance Plot Analysis of Nonlinear Response of PMMA During Nanoindentation
Application of nanoindentation testing to polymeric materials has produced linear viscoelastic properties with the hope of extending results to the nonlinear behavior range. Analysis has indicated that levels of stress well into the nonlinear range are present directly under the indenter. This paper examines how this high stress behavior can be characterized for PMMA material recently tested by nanoindentation. Although stress levels are low compared to many structural materials, a characterization by a compliance plot is made by analogy with the treatment used for metals and other elastic-plastic materials. It illustrates the nature of the stress build-up process during nanonidentation of this polymeric material.
KeywordsRelaxation Modulus Nanoindentation Testing Spherical Indenter Prony Series Linear Viscoelastic Property
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