Residual stress in polyethylene pipes |
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Affiliation: | 1. Laboratory of Control and Mechanical Characterization of Materials and Structures, National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II University, Casablanca, Morocco;2. Institut Suprieur des Etudes Maritimes (ISEM), Km 7 Route d''El Jadida, Casablanca, Morocco;3. Condensed Matter Physics Laboratory, Faculty of Sciences Ben M''Sik, University Hassan II of Casablanca, B.P. 7955 Casablanca, Morocco |
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Abstract: | 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. |
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Keywords: | Polyethylene pipe Residual stress Ring slitting method Lifetime estimation |
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