An unusual elastoplastic response of thermoplastic elastomers at cyclic deformation

A. D. Drozdov

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Observations are reported on a thermoplastic elastomer (ethylene-octene copolymer) in uniaxial tensile tests. The experimental data reveal a rather unusual mechanical response: unlike particle-reinforced rubbers, for which preconditioning causes a monotonic decrease in tensile stress compared with that in a virgin specimen, cyclic preloading of the thermoplastic elastomer induces a reduction in stress at small strains and its noticeable growth at relatively large elongation ratios. A constitutive model is derived for the elastoplastic behavior of a polymer network with constrained chains at three-dimensional deformations with finite strains. The stress-strain relations involve five adjustable parameters that are found by fitting the experimental data. Good agreement is demonstrated between the observations and the results of numerical simulation. It is shown that the material parameters are affected by intensity of preloading in a physically plausible way.

Original languageEnglish
Pages (from-to)660-678
Number of pages19
JournalInternational Journal of Engineering Science
Volume45
Issue number2-8
DOIs
StatePublished - 1 Feb 2007

Keywords

  • Constitutive equations
  • Cyclic deformation
  • Finite elasticity
  • Plasticity
  • Polymer networks

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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