Abstract
The step value on the wave relief of the mirror zone, d, has been measured on a series of successive microphotographs from replicas taken from rupture surfaces of oriented capron monofibres and relationships corresponding to the increase in d with an increase in crack length have been obtained. The effect of preliminary heat treatment and rate of extension on the way in which d depends on crack length has been discussed. It is shown that there is a certain minimum displacement of the crack front, which does not depend on the crack speed within the mirror zone and which is therefore related to specific structural formations of the microfibril type. The change in the value of the minimum displacement as a result of annealing correlates with the coarsening of the elements in the internal structure, as is confirmed by X-ray structural analysis.
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