  This paper presents a micro-mechanical approach to describe the effects of
thermo-oxidation on the constitutive behavior of aged elastomers at the
long-range timescales. In particular, this model focuses on the effects of
thermo-oxidative aging on the quasi-static mechanical response of elastomer and
their inelastic responses such as Mullins effect and permanent set over time.
The model is validated with respect to a comprehensive set of experimental data
designed by Johlitz et al. to capture thermo-oxidative effect on constitutive
behavior of elastomers. Besides accuracy, the model is relatively simple and
easy to fit. It requires ten material parameters, all with clear physical
meaning, which can be derived from only one set of experiment.
