Modelling an anomalous stress relaxation in glassy polymers (the Kitagawa effect)

A. D. Drozdov

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Constitutive relations are derived for the nonlinear viscoelastic response of glassy polymers. The model is based on the concept of adaptive links (a version of the theory of transient networks), where the rates of annihilation of active links are determined by the Eyring formula. Adjustable parameters in the constitutive equations are found by using experimental data for a polyester resin in standard relaxation tests. The stress-strain relations are applied to describe an anomalous stress relaxation in solid polymers observed in tensile test after strain reversal (the Kitagawa effect). Qualitative agreement is demonstrated between results of numerical simulation and observations.

Original languageEnglish
Pages (from-to)45-67
Number of pages23
JournalMathematical and Computer Modelling
Issue number12
StatePublished - 1 Jun 1998
Externally publishedYes


  • Constitutive equations
  • Glassy polymers
  • Nonlinear viscoelasticity
  • Nonmonotonic loading
  • Transient networks

ASJC Scopus subject areas

  • Modeling and Simulation
  • Computer Science Applications


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