The fatigue endurance of unnotched samples of a rubber modified, high impact polystyrene (HIPS) was determined under tension-compression cycling. The role of the rubber phase inclusions in the fatigue fracture process was further studied by detailed examination of the fracture surfaces by optical methods and by scanning electron microscopy. The observed morphology is compared with that obtained on HIPS samples subject to simple tension bonding and with that obtained on the unmodified polystyrene homopolymer. The dispersed rubber phase particles lead to an increased fatigue crack propagation resistance and, if comparison is made on the basis of the same relative stress, the rubber modified polymer leads also to increased fatigue lifetimes. The influence of various environmental variables such as elevated temperature annealing, surface condition, and surface treatments is discussed. Silicon oil coatings of low viscosity tend to significantly reduce fatigue lifetimes, but lifetimes increase with increased viscosity of oil coating. Significant enhancement in fatigue endurance can be realized by use of elastomeric coatings, such as a thin layer of nitrile rubber.
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Sauer et al. (1981) studied this question.
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