Abstract
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Two techniques have been used to examine the reported discrepancy between the measured fracture toughness of rigid PVC and that calculated from its crack tip craze. The use of a generalized model of a cohesive zone produced no better agreement between calculation and experiment than the Dugdale model used previously. The discrepancy was probably caused by the coexistence with the craze of a yield zone which was observed by optical and scanning electron microscopy. �� 1980 Chapman and Hall Ltd.