Residual stress in polyethylene pipes

0463439 - ÚFM 2017 RIV GB eng J - Journal Article
Poduška, Jan - Hutař, Pavel - Kučera, J. - Frank, A. - Sadílek, J. - Pinter, G. - Náhlík, Luboš
Residual stress in polyethylene pipes.
Polymer Testing. Roč. 54, SEP (2016), s. 288-295. ISSN 0142-9418. E-ISSN 1873-2348
R&D Projects: GA MŠMT LM2015069; GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : polyethylene pipe * residual stress * ring slitting method * lifetime estimation
Subject RIV: JL - Materials Fatigue, Friction Mechanics
Impact factor: 2.464, year: 2016

This paper deals with residual stress in polyethylene (PE) pipes as an important factor that influences their lifetime. Residual hoop stress distribution in a PE pipe was determined using a methodology previously carried out by the authors on polypropylene pipes. Axial residual stress magnitude was determined by comparison of experimental data and finite element modelling. Based on the obtained results, a new simplified methodology for determining the residual hoop stress is proposed. The method needs only one circular specimen made of pipe, but, unlike older methods, provides a more precise estimation of residual hoop stress distribution taking into account its exponential shape. Some older results from literature are recalculated using this method and residual hoop stress of various PE pipe grades and dimensions are then compared. To provide an idea of residual hoop stress influence on lifetime of a pipe, a lifetime estimation is carried out for the examined pipe.
Permanent Link: http://hdl.handle.net/11104/0262696