Journal of Theoretical
and Applied Mechanics

53, 3, pp. 593-604, Warsaw 2015
DOI: 10.15632/jtam-pl.53.3.593

An internal-state-variable based viscoelastic-plastic model for polymers

Cyprian Suchocki
In this study, a new viscoelastic-plastic constitutive model which has been formulated by utilizing the formalism of stress-like internal state variables is introduced. The developed constitutive equation allows for a good description of the inelastic material response of polymeric materials over a wide range of strain rates. An algorithm for numerical integration of the model equations has been derived. The FE implementation of the constitutive equation is widely discussed and the results of solving several exemplary problems are presented.
Keywords: polymers, rheology, constitutive equation, finite element method