Volume 30, Issue 1, April 2017, Pages 91–98
Abderrazak OUARDI1, Fatima MAJID2, Hicham FARID3, and Mohamed EL GHORBA4
1 Control and Mechanical Characterization of Materials and Structures laboratory , National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II University, Casablanca, Morocco
2 Control and Mechanical Characterization of Materials and Structures laboratory , National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II University, Casablanca, Morocco
3 Canada Research Chair on Atmospheric Icing Engineering of Power Networks (INGIVRE), University of Quebec in Chicoutimi Qc, Chicoutimi, Quebec, Canada
4 Control and Mechanical Characterization of Materials and Structures laboratory , National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II University, Casablanca, Morocco
Original language: English
Copyright © 2017 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The polypropylene copolymer (PPR) is a thermoplastic material widely used to transport hot and cold water under pressure. In operation, PPR pipes are sometimes subjected to accidental damages that may cause a reduction in residual resistance or even a complete fracture of the structure. Hence the need to characterize the behavior of virgin and defective PPR pipes under pressure to develop carefully a maintenance strategy to ensure a minimum cost with the maximum reliability. In this article and according to ASTM D1599, we conducted a set of real tests of bursting on virgin and notched pipes to assess the level of damage reaches mechanically and characterize the behavior pipes in PPR pipes. The experimental results allowed and identification of the three stages of development of damage namely: initiation, progression and sudden acceleration. The estimation of the damage degree by the model of static damage led to identify theoretically the three stages of the evolution of damage. Subsequently, a theoretical reassessment of the damage level was done through a judicious adaptation of the theoretical model proposed in unified theory of damage. Theoretical and experimental results showed a good agreement.
Author Keywords: PPR pipes, mechanical characterization, burst test, static damage, unified damage.
Abderrazak OUARDI1, Fatima MAJID2, Hicham FARID3, and Mohamed EL GHORBA4
1 Control and Mechanical Characterization of Materials and Structures laboratory , National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II University, Casablanca, Morocco
2 Control and Mechanical Characterization of Materials and Structures laboratory , National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II University, Casablanca, Morocco
3 Canada Research Chair on Atmospheric Icing Engineering of Power Networks (INGIVRE), University of Quebec in Chicoutimi Qc, Chicoutimi, Quebec, Canada
4 Control and Mechanical Characterization of Materials and Structures laboratory , National Higher School of Electricity and Mechanics, BP 8118 Oasis, Hassan II University, Casablanca, Morocco
Original language: English
Copyright © 2017 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The polypropylene copolymer (PPR) is a thermoplastic material widely used to transport hot and cold water under pressure. In operation, PPR pipes are sometimes subjected to accidental damages that may cause a reduction in residual resistance or even a complete fracture of the structure. Hence the need to characterize the behavior of virgin and defective PPR pipes under pressure to develop carefully a maintenance strategy to ensure a minimum cost with the maximum reliability. In this article and according to ASTM D1599, we conducted a set of real tests of bursting on virgin and notched pipes to assess the level of damage reaches mechanically and characterize the behavior pipes in PPR pipes. The experimental results allowed and identification of the three stages of development of damage namely: initiation, progression and sudden acceleration. The estimation of the damage degree by the model of static damage led to identify theoretically the three stages of the evolution of damage. Subsequently, a theoretical reassessment of the damage level was done through a judicious adaptation of the theoretical model proposed in unified theory of damage. Theoretical and experimental results showed a good agreement.
Author Keywords: PPR pipes, mechanical characterization, burst test, static damage, unified damage.
How to Cite this Article
Abderrazak OUARDI, Fatima MAJID, Hicham FARID, and Mohamed EL GHORBA, “Level of damage assessment of polypropylene pipes (PPR) subjected to burst pressure tests using static and unified damages and estimation of the remaining life,” International Journal of Innovation and Scientific Research, vol. 30, no. 1, pp. 91–98, April 2017.
