The Effect of Polymer Pipe Weld Geometry on Creep Lifetime

0353503 - ÚFM 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