A network evolution model for the anisotropic Mullins effect

Abstract

In this contribution, a micro‐mechanical constitutive model for filled rubberlike materials is proposed. Rubber network is decomposed into two parts, elastic rubber network and polymer‐filler network. As a consequence of filler contribution, the last one is subjected to damage. A non‐Gaussian strain energy function for a single chain with a constant valence angle has been postulated. Damage in different directions is governed by the corresponding maximal micro‐stretch and is considered as a result of network evolution. Directional network rearrangement as a consequence of network evolution has been employed in order to describe induced anisotropy and permanent set. The model shows good agreement with experimental data on uniaxial tension tests in two orthogonal directions. (© 2008 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)