Material Property Differentiation in Indentation Testing Using Secondary Sensors |
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Authors: | A Balakrishnan S Socrate |
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Institution: | (1) Massachusetts Institute of Technology, Cambridge, MA, USA |
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Abstract: | Current in vivo and in situ testing procedures are dominated by indentation. The major challenge for this testing technique is in finding a unique solution
to the “inverse problem” i.e., defining an appropriate constitutive framework and obtaining material properties consistent
with the indentation force–displacement data. Much of the information related to the interplay between shear and bulk compliance
in the deformation field beneath the indenter is lost when capturing this single output. We propose a material testing method
that follows the well proven path of conventional indentation methods, but enriches the signal by acquiring displacement data
not only for the actuated indenter, but also for a set of offset, passive secondary sensors. We use finite element (FE) simulations
involving three cases of materials: (a) linear elastic, (b) hyperelastic and (c) time-dependent to demonstrate the benefit
of these additional sensors. The results indicate that the addition of these secondary sensors can help to discern between
materials with varying degrees of compressibility. |
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Keywords: | Indentation Inverse problem Poisson’ s ratio |
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