Multi-cycle viscoplastic deformation of polypropylene

A. D. Drozdov

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Experimental data are reported on isotactic polypropylene in tensile cyclic tests with a strain-controlled program (150 cycles) and various maximum strains. A model is developed in cyclic viscoplasticity of semicrystalline polymers. The constitutive equations describe the mechanical response along each individual cycle of loadingunloading. Material constants in the stressstrain relations are found by fitting observations during several first cycles. For cyclic deformation with a large number of cycles, phenomenological equations are introduced to account for the effect of plastic flow and damage accumulation on adjustable parameters. It is demonstrated that the model qualitatively predicts changes in maximum stress and minimum strain per cycle with number of cycles. The stressstrain relations are applied to assess growth of residual strain under cyclic loading with large (tens of thousand) number of cycles.

Original languageEnglish
Pages (from-to)1991-2000
Number of pages10
JournalComputational Materials Science
Issue number7
StatePublished - 1 May 2011
Externally publishedYes


  • Constitutive model
  • Cyclic deformation
  • Isotactic polypropylene
  • Viscoplasticity

ASJC Scopus subject areas

  • Computer Science (all)
  • Chemistry (all)
  • Materials Science (all)
  • Mechanics of Materials
  • Physics and Astronomy (all)
  • Computational Mathematics


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