Abstract
The failure of polystyrene in cyclic deformation has been examined and compared with the fracture mechanisms involved in simple tension. The fatigue response can be divided into three discrete life ranges. In the short and intermediate life regions, fracture occurs by the processes of craze formation, craze growth, crack nucleation and crack propagation in a manner analogous to tensile failure. The primary influence of reversed straining is manifest as an acceleration of the crack formation stage of failure. In long life (low stress) fatigue, failure modes dissimilar to the documented craze breakdown pattern of crack nucleation are noted.
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