Cyclic viscoplasticity of solid polymers: The effects of strain rate and amplitude of deformation

A. D. Drozdov, J. de C. Christiansen

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Observations are reported on polypropylene random copolymer in uniaxial cyclic tensile tests with various strain rates (ranging from 1.7 × 10-4 to 8.3 × 10-3 s-1). Each cycle of deformation involves tension up to the maximal strain ε{lunate}max (from 0.05 to 0.20) and retraction down to the zero stress. The study focuses on deformation programs with 10-50 cycles in each test. A constitutive model is derived for the viscoplastic behavior of a solid polymer at three-dimensional cyclic deformations with small strains. Material constants in the stress-strain relations are found by fitting the experimental data. Good agreement is demonstrated between the observations and the results of numerical simulation.

Original languageEnglish
Pages (from-to)3003-3012
Number of pages10
JournalPolymer
Volume48
Issue number10
DOIs
StatePublished - 4 May 2007

Keywords

  • Cyclic deformation
  • Polypropylene
  • Viscoplasticity

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