Počet záznamů: 1

The Effect of Polymer Pipe Weld Geometry on Creep Lifetime

  1. 1.
    0353503 - UFM-A 2011 RIV CH eng J - Článek v odborném periodiku
    Ševčík, Martin - Knésl, Zdeněk - Hutař, Pavel - Náhlík, Luboš
    The Effect of Polymer Pipe Weld Geometry on Creep Lifetime.
    Key Engineering Materials. Roč. 465, - (2011), s. 175-178 ISSN 1013-9826
    Grant CEP: GA ČR GC101/09/J027
    Výzkumný záměr: CEZ:AV0Z20410507
    Klíčová slova: creep * stress concentration factor * lifetime * triaxiality
    Kód oboru RIV: JL - Únava materiálu a lomová mechanika

    In the case of large diameter polyethylene (PE) and polypropylene (PP) pipes the most usual joint is the butt weld. This paper focuses on the influence of a weld bead on the service life of welded pipes from a fracture mechanics perspective. To this aim the stress concentrator created by the connection between the weld bead and the pipe’s free surface is modelled as a notch. Global parameters defining properties of stress and strain field in the notch region are calculated for materials with a prevailing Norton-type creep. It is demonstrated that in the case of creep loading conditions and ductile failure mode the existence of such stress concentrators has no negative influence on the lifetime of pipes.
    Trvalý link: http://hdl.handle.net/11104/0192742