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Research Article

Environmental stress cracking of chemically aged HDPE-100 gas pipe under impact fracture mode

Khaoula Berkas1Kamel Chaoui1Wafia Ghabeche2Latifa Alimi3, Abir Guenouche1Fatima Zohra Melais4

1Mechanics of Materials and Industrial Maintenance Research Laboratory (LR3MI), Mechanical Eng. Dept., Faculty of Technology, Badji Mokhtar University, PO Box 12, 23005 Annaba, Algeria

2Electrical Eng. Dept., Faculty of Technology, Abderahmane Mira University, Targa Ouzemour, 06000 Béjaia, Algeria

3Research Center in Industrial Technologies (CRTI), PO Box 64, Chéraga, 16014 Algiers, Algeria

4Civil Eng. Dept., Faculty of Technology, Badji Mokhtar University, PO Box 12, 23005 Annaba, Algeria

Keywords

Abstract




Polyethylene pipe;



Ageing effects;



Sorption;



Charpy fracture energy;



Fracture surface

High-density polyethylene (HDPE) pipes are widely employed for urban gas, water and sewage transportation networks because of economic considerations and very satisfactory lifetimes. As they are straight forwardly designated for numerous hostile conditions, the stress cracking resistance needs to be investigated in combination with ageing in controlled environments. This study is set to investigate long-term sorption experiments followed by Charpy fracture tests using the same arc-shaped specimens machined from HDPE pipe. Chemically ageing media are deionized water (DW) and both hydrochloric (HA) and acetic acids (AA). For the first 4 weeks, it is found that % weight change increased drastically for HA medium. Then, for the next 30 weeks period, the inverse situation took place as the % weight change for HA diminished tending nearly to zero while it augmented for DW and AA environments. Within the first week, the impact fracture energy of HDPE decreased for all media and then increased substantially for both acids well above the as-received (AR) reference line. Charpy energy experienced a monotonic decrease for DW as swelling enhancement is promoted in the absence of plasticized material. After 7 months ageing, both acids show much higher Charpy energies than AR and DW specimens and a substantial increase in ductility. The resilience changes with respect to AR tests are respectively +110%, +75% and –25.8% for HA, AA and DW. It is accepted that strong acids (i.e., HA) easily deplete antioxidants and carbon black mixed with the resin. The combined effects of both mechanical and chemical processes can serve a more representative durability studies of HDPE pipes including ESC phenomenon.

© 2023 MIM Research Group. All rights reserved.

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21/10/2023 Journal Submission System Upgrade Completed: We're delighted to announce that our Journal Submission and Tracking System has undergone a significant upgrade, aimed at enhancing your experience. We apologize for the delay, and any inconvenience it may have caused. Here are the key enhancements from a user perspective:

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27/12/2022 Reviewer AwardsThe winners of 2022 reviewer awards of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Reviewer Awards section. 


23/12/2022 Best Paper Award: According to the Advisory Board decision, the paper authored by Nitin Kumar, Michele Barbato, Erika L. Rengifo-López and Fabio Matta entitled as “Capabilities and limitations of existing finite element simplified micro-modeling techniques for unreinforced masonry” is awarded the 2022 Best Paper Award of Research on Engineering Structures and Materials (RESM). 

23/12/2022 Most Cited Paper Award:  According to the Editorial Board evaluation, the paper authored by Aykut Elmas, Güliz Akyüz, Ayhan Bergal, Müberra Andaç and Ömer Andaç entitled as “Mathematical modelling of drug release" is awarded the 2022 Most Cited Paper Award of Research on Engineering Structures and Materials (RESM). 



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LATEST AWARDS


2022 Reviewer Awards:

Please, visit Reviewer Awards section for the winners of the 2022 RESM reviewer awards.


2022 Best Paper Award:

The paper authored by Nitin Kumar, Michele Barbato, Erika L. Rengifo-López and Fabio Matta entitled as “Capabilities and limitations of existing finite element simplified micro-modeling techniques for unreinforced masonry” is awarded the 


2022 Most Cited Paper Award:

The paper authored by Aykut Elmas, Güliz Akyüz, Ayhan Bergal, Müberra Andaç and Ömer Andaç entitled as “Mathematical modelling of drug release" is awarded the


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