FRACTURE MECHANICS ASSESSMENT OF CRACKED WELDED POLYOLEFIN PIPES

0465158 - ÚFM 2017 RIV CZ eng C - Conference Paper (international conference)
Mikula, Jakub - Ševčík, Martin - Hutař, Pavel - Náhlík, Luboš
FRACTURE MECHANICS ASSESSMENT OF CRACKED WELDED POLYOLEFIN PIPES.
Engineering Mechanics 2014. 20th International conference. May 12-15, 2014, Svratka, Czech Republic. Book of full texts. Brno: Brno University of Technology. Institute of Solid Mechanics, Mechatronics and Biomechanics, 2014 - (Fuis, V.), s. 396-399. ISBN 978-80-214-4871-1. ISSN 1805-8248.
[EM - International Conference on Engineering Mechanics /20./. Svratka (CZ), 12.05.2014-15.05.2014]
R&D Projects: GA MŠMT(CZ) EE2.3.30.0063; GA ČR(CZ) GAP108/12/1560
Institutional support: RVO:68081723
Keywords : Polyolefin pipes * butt weld * stress intensity factor * numerical loading
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The aim of this paper is to present methodology for estimation of fracture mechanics parameters in polyolefin pipes with an axially oriented crack using three dimensional numerical analyses. Linear elastic fracture mechanics is used for description of fracture behavior. In the paper, three different variants of pipe weld with an internal axial semi-elliptical crack are studied. Numerical models correspond to a cracked pipe containing material nonhomogeneity in the welding area caused by welding process. A critical locations of the crack initiated along the pipe wall is found and the stress intensity factor for such cracks with real crack shape are numerically estimated in these critical locations. The methodology presented here can be used for estimation of residual lifetime of welded polymer pipes containing crack.
Permanent Link: http://hdl.handle.net/11104/0264029