PSI - Issue 43

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com cience irect Structural Integrity Procedia 00 (2022) 000 – 000

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Procedia Structural Integrity 43 (2023) 148–153

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. Abstract Due to the very long operational lifetimes (up to 100 years) of polyethylene pipes, there is a strong demand for accelerated testing of pipe materials to experimentally prove the ability of a certain material to achieve such lifetime. Among the accelerated tests of performance, the cracked round bar (CRB) test is the most convenient. The CRB test takes advantage of cyclic loading that is applied on cylindrical specimens with a circumferential notch in the middle. The specimens are usually manufactured from plates produced by compression molding from the investigated material. However, for polyethylene pipe producers, the possibility of making the specimens by extrusion would save time and lower the costs. This study is dealing with the comparison of CRB test, and a new test carried out on notched pipe samples produced by extrusion. The goal is to investigate the possibility of measuring the performance directly on extruded pipe specimens. The comparison is illustrated on experimental results of several polyethylene pipe grades of PE80, PE100 and PE100RC often used for pipe manufacture. 23 The Authors. Published by Elsevier B.V. is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) r-review under th responsibility of MSMF10 organizers. Keywords: extruded pipe specimens; SCG resistance; polyethylene pipe lifetime; accelerated testing 1. Introduction Polymer pipes have been used for more than 70 years for water and gas transportation as well as for sewage systems. For high-quality pipes made of modern materials, such as high-density polyethylene (HDPE), lifetimes between 50 to 10th International Conference on aterials Structure and icromechanics of Fracture o parison of fatigue perfor ance of polyethylene pipe grades in the for of extruded and co pression olded speci ens Lukáš Trávníček a,b *, Jan Poduška b , Jaroslav Kučera c , Luboš Náhlík b and Pavel Hutař b a CEITEC BUT, Purkyňova 123, 621 00 Brno, Czech Republic b Institute of Physics of Materials AS CR, Žižkova 22, 616 00 Brno, Czech Republic c Polymer Instit ute Brno, Tkalcovská 36/2, 602 00 Brno, Czech Republic Abstract Due to the very long operational lifetimes (up to 100 years) of polyethylene pipes, there is a strong demand for accelerated testing of pipe materials to experimentally prove the ability of a certain material to achieve such lifetime. Among the accelerated tests of performance, the cracked round bar (CRB) test is the most convenient. The CRB test takes advantage of cyclic loading that is applied on cylindrical specimens with a circumferential notch in the middle. The specimens are usually manufactured from plates produced by compression molding from the investigated material. However, for polyethylene pipe producers, the possibility of making the specimens by extrusion would save time and lower the costs. This study is dealing with the comparison of CRB test, and a new test carried out on notched pipe samples produced by extrusion. The goal is to investigate the possibility of measuring the performance directly on extruded pipe specimens. The comparison is illustrated on experimental results of several polyethylene pipe grades of PE80, PE100 and PE100RC often used for pipe manufacture. © 20 23 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. Keywords: extruded pipe specimens; SCG resistance; polyethylene pipe lifetime; accelerated testing 1. Introduction Polymer pipes have been used for more than 70 years for water and gas transportation as well as for sewage systems. For high-quality pipes made of modern materials, such as high-density polyethylene (HDPE), lifetimes between 50 to 10th International Conference on Materials Structure and Micromechanics of Fracture Comparison of fatigue performance of polyethylene pipe grades in the form of extruded and compression molded specimens Lukáš Trávníček a,b *, Jan Poduška b , Jaroslav Kučera c , Luboš Náhlík b and Pavel Hutař b a CEITEC BUT, Purkyňova 123, 621 00 Brno, Czech Republic b Institute of Physics of Materials AS CR, Žižkova 22, 616 00 Brno, Czech Republic c Polymer Instit ute Brno, Tkalcovská 36/2, 602 00 Brno, Czech Republic

* Corresponding author. Tel.: +420 532 290 347. E-mail address: travnicek@ipm.cz * Corresponding author. Tel.: +420 532 290 347. E-mail address: travnicek@ipm.cz

2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers.

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 10.1016/j.prostr.2022.12.250