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)).


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    Title :

    Rapid crack propagation in polyethylene pipe: combined effect of strain rate and temperature on fracture toughness


    Additional title:

    Schnelle Rißausbreitung in einem Polyethylenrohr: Die kombinierte Auswirkung von Dehngeschwindigkeit und Temperatur auf die Bruchzähigkeit


    Contributors:
    Massa, F. (author) / Piques, R. (author) / Laurent, A. (author)

    Published in:

    Journal of Materials Science ; 32 , 24 ; 6583-6587


    Publication date :

    1997


    Size :

    5 Seiten, 10 Bilder, 4 Tabellen, 7 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English