The studies presented in this dissertation investigated the characteristics of dynamic ductile crack propagation and arrest in a pressurized pipeline, and developed an improved model for providing more reliable and economical design guidelines. This research was able to device and perform model scale ductile pipe rupture experiment. The quantitative results include crack velocity, depressurization history, crack opening and near tip crack tip opening angle (CTOA), and strain history. Experiments on investigation pipe flap constraint effect confirm that the driving force comes from the pressure on the fractured flap behind and very near the crack tip. An experimentally observed and measured CTOA versus crack velocity relationship justify the use of CTOA as propagating ductile pipe fracture criterion. A Split Ring Model, based on a force analysis and experimentally/numerically incorporated plastic energy dissipation, was developed which successfully prodict the full scale pipe fracture. The model also shows the capability of predicting the effect of pipe flap constraint. The characteristic curve predicted by the model, CTOA versus crack velocity, for a specific pipe configuration and operating conditions can be used to ensure a self-arrest pipe fracture.


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    Title :

    A propagating ductile model for a pressurized pipeline


    Additional title:

    Modell eines sich ausbreitenden duktilen Bruchs fuer eine Druckrohrleitung


    Contributors:

    Publication date :

    1987


    Size :

    214 Seiten


    Type of media :

    Theses


    Type of material :

    Print


    Language :

    English




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