PSI - Issue 33

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 33 (2021) 724–733

© 2021 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 responsibility of the scientific committee of the IGF ExCo Abstract In the recent years, high density polyethylene (HDPE) has been adopted in several industrial fields due to its good mechanical resistance, lightness and low cost, for the realization of pipelines. According to the current standards, welding techniques in such application have to guarantee a reliable connection of the different pipe sections but, on the other hand, they can also alter the mechanical performances of the polyethylene due to the heating procedure. Mechanical and fatigue tests should be performed in order to derive the working load conditions at which the pipe withstand without any failure or leakage of the internal fluid. Generally, traditional fatigue tests are extremely time consuming and requires a huge amount of material. Recently, the Static Thermographic Method (STM) has been applied to a large set of engineering materials to evaluate the limit stress at which the material surface temperature trend deviates from the linearity during a static traction test, indicating the initiation of damage within the material. In the present work, the STM is applied on welded specimens made of PE100 in order to investigate its fatigue properties. The predicted limit stress has been compared with the fatigue limit obtained with traditional fatigue tests showing good agreement. © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: polyethylene; fatigue assessment; butt fusion; welding; Static Thermographic Method IGF26 - 26th International Conference on Fracture and Structural Integrity Fatigue damage assessment of welded HDPE details evaluating their energy release Dario Santonocito*, Filippo Cucinotta, Eugenio Guglielmino, Giacomo Risitano University of Messina, Department of Engineering, C.da di Dio, 98166 Messina, ITALY

* Corresponding author. Tel.: +39 3396190552. E-mail address: dsantonocito@unime.it

2452-3216 © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo

2452-3216 © 2021 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 responsibility of the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.080