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The Effect of Polymer Pipe Weld Geometry on Creep Lifetime
- 1.0353503 - ÚFM 2011 RIV CH eng J - Journal Article
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
R&D Projects: GA ČR GC101/09/J027
Institutional research plan: CEZ:AV0Z20410507
Keywords : creep * stress concentration factor * lifetime * triaxiality
Subject RIV: JL - Materials Fatigue, Friction Mechanics
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.
Permanent Link: http://hdl.handle.net/11104/0192742
Number of the records: 1