Residual life prediction of defected Polypropylene Random copolymer pipes (PPR)

The polypropylene random copolymer (PPR) is a thermoplastic material generally used for the transport of water under pressure, especially hot water. PPR pipes are exposed to severe conditions in terms of pressure and temperature, hence the need to characterize their fracture behavior in order to avo...

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Main Authors: Abderazzak Ouardi, Fatima Majid, Nadia Mouhib, Mohamed Elghorba
Format: Article
Language:English
Published: Gruppo Italiano Frattura 2018-01-01
Series:Frattura ed Integrità Strutturale
Subjects:
Online Access:http://www.gruppofrattura.it/pdf/rivista/numero43/numero_43_art_7.pdf
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spelling doaj-bd3f83c6d2a5417b8e4571b45eb4e78b2020-11-24T23:02:46ZengGruppo Italiano FratturaFrattura ed Integrità Strutturale1971-89932018-01-0112439710510.3221/IGF-ESIS.43.0710.3221/IGF-ESIS.43.07Residual life prediction of defected Polypropylene Random copolymer pipes (PPR)Abderazzak OuardiFatima MajidNadia MouhibMohamed ElghorbaThe polypropylene random copolymer (PPR) is a thermoplastic material generally used for the transport of water under pressure, especially hot water. PPR pipes are exposed to severe conditions in terms of pressure and temperature, hence the need to characterize their fracture behavior in order to avoid the design risks. Sudden overpressure is one of the most common problems in piping. It can affect the security of goods and the safety of people. In this context, we have performed tests of overpressures at the laboratory scale according to ASTM D1599 standard, on virgin and notched pipes, to characterize mechanically the fracture behavior of PPR pipes. Afterwards, we identify experimentally the evolution of their damage. The calculation of the damage, by experimental damage models, have led to determine the three stages of evolution of the damage, which are the initiation, the progression and the acceleration of it. Therefore, the concept of reliability is used to specify the critical life fraction relative to the notch depth (c) of a defect modeled as an external longitudinal groove on the PPR pipe. A comparison of PPR and HDPE pipes damage and reliability has been done. Moreover, a theoretical reassessment of the damage level was done through a judicious adaptation of the theoretical model proposed by the unified theory. From the latter, we proved that theoretical and experimental results show good agreement and correlationshttp://www.gruppofrattura.it/pdf/rivista/numero43/numero_43_art_7.pdfMechanical characterization PPR themoplastic pipes damage reliability burst pressure
collection DOAJ
language English
format Article
sources DOAJ
author Abderazzak Ouardi
Fatima Majid
Nadia Mouhib
Mohamed Elghorba
spellingShingle Abderazzak Ouardi
Fatima Majid
Nadia Mouhib
Mohamed Elghorba
Residual life prediction of defected Polypropylene Random copolymer pipes (PPR)
Frattura ed Integrità Strutturale
Mechanical characterization
PPR themoplastic pipes
damage
reliability
burst pressure
author_facet Abderazzak Ouardi
Fatima Majid
Nadia Mouhib
Mohamed Elghorba
author_sort Abderazzak Ouardi
title Residual life prediction of defected Polypropylene Random copolymer pipes (PPR)
title_short Residual life prediction of defected Polypropylene Random copolymer pipes (PPR)
title_full Residual life prediction of defected Polypropylene Random copolymer pipes (PPR)
title_fullStr Residual life prediction of defected Polypropylene Random copolymer pipes (PPR)
title_full_unstemmed Residual life prediction of defected Polypropylene Random copolymer pipes (PPR)
title_sort residual life prediction of defected polypropylene random copolymer pipes (ppr)
publisher Gruppo Italiano Frattura
series Frattura ed Integrità Strutturale
issn 1971-8993
publishDate 2018-01-01
description The polypropylene random copolymer (PPR) is a thermoplastic material generally used for the transport of water under pressure, especially hot water. PPR pipes are exposed to severe conditions in terms of pressure and temperature, hence the need to characterize their fracture behavior in order to avoid the design risks. Sudden overpressure is one of the most common problems in piping. It can affect the security of goods and the safety of people. In this context, we have performed tests of overpressures at the laboratory scale according to ASTM D1599 standard, on virgin and notched pipes, to characterize mechanically the fracture behavior of PPR pipes. Afterwards, we identify experimentally the evolution of their damage. The calculation of the damage, by experimental damage models, have led to determine the three stages of evolution of the damage, which are the initiation, the progression and the acceleration of it. Therefore, the concept of reliability is used to specify the critical life fraction relative to the notch depth (c) of a defect modeled as an external longitudinal groove on the PPR pipe. A comparison of PPR and HDPE pipes damage and reliability has been done. Moreover, a theoretical reassessment of the damage level was done through a judicious adaptation of the theoretical model proposed by the unified theory. From the latter, we proved that theoretical and experimental results show good agreement and correlations
topic Mechanical characterization
PPR themoplastic pipes
damage
reliability
burst pressure
url http://www.gruppofrattura.it/pdf/rivista/numero43/numero_43_art_7.pdf
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