Abstract

The statistical and mechanical models underlying the kinetic theories of fracture of glasses, thermoplasts and rubbers are analyzed and specified for polymers in their glassy state. Special attention is given to results from recent electron resonance experiments, and to the elastic, anelastic and permanent deformation of a polymer before and during the experiment leading to failure. A model is constructed which is in accordance with the observed material behavior, and which consists of an elastic molecular network embedded in a viscoelastic continuum. On the basis of the specified conditions times-to-break are calculated as a function of applied load and degree of orientation of the polymer network. The calculated times-to-break are compared with experimental data.

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