The need to predict the mechanical behaviour of polymers is motivated by the increasing use of these materials in structural applications. In order to consider safety in the design of engineering components, the question of a criterion for rapid crack propagation has been investigated in a medium density polyethylene (MDPE) used to extrude pipes for gas distribution. Work on the strain rate-temperature equivalence (epsilon(dot) is equivalent to T) was performed to study the yield stress, sigmas, as a function of epsilon(dot) and T. A shifting procedure enabled a behavioural master curve, sigmas versus 1/(aT epsilon(dot)) to be drawn, where aT is the shift factor. Both cracked-ring and Charpy specimens were tested to characterize the fracture toughness KIC(T) of the MDPE. The values of the KIC(T) based on linear elastic fracture mechanics are superposed to form a fracture toughness master curve: KIC versus 1/(aT epsilon(dot)).
Rapid crack propagation in polyethylene pipe: combined effect of strain rate and temperature on fracture toughness
Schnelle Rißausbreitung in einem Polyethylenrohr: Die kombinierte Auswirkung von Dehngeschwindigkeit und Temperatur auf die Bruchzähigkeit
Journal of Materials Science ; 32 , 24 ; 6583-6587
1997
5 Seiten, 10 Bilder, 4 Tabellen, 7 Quellen
Article (Journal)
English
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