Abstract
In some hard, viscoelastic polymers crack growth is associated with the formation of a wedge of crazed material at the tip of the crack. The crazed material is formed from the bulk material by growth of holes at a given stress which can be likened to a yield stress for metals.This paper deals with the time at which a penny-shaped crack surrounded by a wedge shaped ring of crazed material begins to propagate. The bulk material is considered viscoelastic and the crazed material in the wedge is modelled by the visco-plasticity model of Crochet. It is found that time-dependent plasticity in the wedge shortens the time to failure in comparison with time-independent plasticity.
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