Abstract
Increasing the cooling rate from the melt has been found to increase the rate of slow crack growth at 42°C. For various histories of cooling rate, annealing and specimen geometries, the initiation rate increased when the density decreased. The effect of residual stresses on slow crack growth was separated from the effect of morphology as reflected by density. It is concluded that the variation in yield point is a factor that affects the rate of slow crack growth. The disentanglement rate of fibrils is also important, but it is primarily controlled by molecular weight and branching.
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