Influence of physical aging on impact embrittlement of uPVC pipes


Visser, H.A. and Bor, T.C. and Wolters, M. and Warnet, L.L. and Govaert, L.E. (2011) Influence of physical aging on impact embrittlement of uPVC pipes. Plastics, Rubber and Composites, 40 (5). pp. 201-212. ISSN 1465-8011

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Abstract:Most failures of unplasticised poly(vinyl chloride) (uPVC) pipes used in the Dutch gas distribution network originate from third party damage. Brittle pipes should therefore be replaced to ensure safe operation of the network. In this study, the relation between physical aging and embrittlement of uPVC is investigated using instrumented falling weight impact tests. The ductile to brittle transition temperature was first measured for a water pipe grade uPVC at different stages of aging. As a hypothesis, a critical stress criterion is proposed above which failure is brittle. The evolution of the ductile to brittle transition temperature that followed from the use of this hypothesis and a model for the polymer yield stress agrees qualitatively with the experimental data. A minor increase in transition temperature was observed for the water pipe grade with aging. Applying the same hypothesis to a uPVC gas pipe grade shows a more pronounced influence of physical aging.
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Copyright:© 2011 Maney Publishing
Engineering Technology (CTW)
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