Effect of viscoplastic material parameters on polymer indentation

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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The effect of material parameters characterizing viscoplastic flow on the indentation response of polymers is investigated using three-dimensional finite element analyses and a one-dimensional expanding spherical cavity model. The polymer is characterized by a finite strain elastic–viscoplastic constitutive relation and two indenter shapes are considered; a conical indenter and a pyramidal indenter. The ability of the simpler expanding spherical cavity model to reproduce the trends obtained from the finite element solutions is assessed for both indenter shapes. Within the range of parameter variations considered, it is found that two material stress parameters characterizing the plastic flow resistance have the largest effect on the value of the indentation hardness although variations in other material parameters can lead to significant variations.
Original languageEnglish
JournalModelling and Simulation in Materials Science and Engineering
Publication date2012
Volume20
Issue6
PagesPaper 065002
Number of pages15
ISSN0965-0393
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 1
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