Creep fracture tests were carried out on a pipe grade polyethylene using arc shaped notched specimens loaded in four point bending. Under all the conditions examined, discontinuous crack growth was observed. The fracture process was analysed considering each single stage of the discontinuous crack propagation independently. An attempt to interpret the results in the framework of viscoelastic fracture theories lead to the conclusion that the Dugdale - Barenblatt model is unable to predict accurately the size of the process zone in this material.
Discontinuous creep crack growth in polyethylene
FRASSINE, ROBERTO;RINK SUGAR, MARTA ELISABETH;PAVAN, ANDREA
1996-01-01
Abstract
Creep fracture tests were carried out on a pipe grade polyethylene using arc shaped notched specimens loaded in four point bending. Under all the conditions examined, discontinuous crack growth was observed. The fracture process was analysed considering each single stage of the discontinuous crack propagation independently. An attempt to interpret the results in the framework of viscoelastic fracture theories lead to the conclusion that the Dugdale - Barenblatt model is unable to predict accurately the size of the process zone in this material.File in questo prodotto:
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