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This paper develops a damage model for unfilled cross-linked rubbers based onthe concept of scission of polymer chains. The model is built up on thewell-known Gent elastic potential complemented by a kinetic equation describingeffects of polymer chain scission. The macroscopic parameters in the damagemodel are evaluated through the parameters for undamaged elastomer. Qualitativeanalysis of changing molecular parameters of rubbers under scission of polymerchains resulted in easy scaling modeling the dependences of these parameters onthe damage factor. It makes possible to predict the rubber failure in molecularterms as mechanical de-vulcanization. The model was tested in tensilequasi-static experiments with both the monotonous loading and repeatedloading-unloading.

Damage of Cross-Linked Rubbers as the Scission of Polymer Chains: Modeling and Tensile Experiments, Report 1