Environmental stress cracking of PVC and PVC-CPE - Part III Crack growth
article
The fracture toughness of Polyvinylchloride (PVC) and PVC modified with 10% chlorinated polyethylene (PVC-CPE) was studied in vapour and in liquid environments by crack growth measurements on single-edge notch specimens under three-point bending at 23°C. In addition, some results obtained in air at lower temperatures are presented. The fracture toughness is quantified by a stress intensity factor leading to failure after a given loading period. It is shown that for a given slow crack growth rate at 23 °C, the environment hardly affects the fracture toughness of PVC. In contrast, the slow crack growth in PVC-CPE at 23 °C is accelerated by the presence of benzene vapour, n-octane/benzene mixtures and gas condensate. A decrease in temperature results in an increase in fracture toughness, both for PVC and for PVC-CPE. A Dugdale model to describe the craze ahead of the crack was used to analyse the observed changes in fracture toughness. © 1995 Chapman & Hall.
Topics
BenzeneCrack propagationCrazingFailure (mechanical)Fracture toughnessGas condensatesMathematical modelsNotched bar tensile testingParaffinsPolyethylenesStress intensity factorsBenzene vapourChlorinated polyethyleneCritical stress intensityEnvironmental stress crackingN-octane/benzene mixturesPlasticizationPolyvinyl chlorides
TNO Identifier
232850
ISSN
00222461
Source
Journal of Materials Science, 30(22), pp. 5833-5840.
Publisher
Kluwer Academic Publishers
Pages
5833-5840
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