PSI - Issue 81

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ScienceDirect

Procedia Structural Integrity 81 (2026) 240–243

© 2026 The Authors. Copy from the contract: 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 DMDP 2025 organizers Keywords: damaged pipeline; restoration; bandage; patching; destructive pressure; strength. 1. Introduction In numerous industrial applications of thin-wall structures, when damaged component replacement is either unfeasible or economically prohibitive, repair procedures are implemented (Thakre et al. (2025)). The utilization of composite patches represents a highly effective methodology for restoring both metallic and composite structures. This repair technique is widely employed to extend the operational service life of damaged structural components such as pipelines and tanks. The use of trenchless technologies is both technologically reasonable and economically efficient, especially in cases where repair of a pipeline is complicated or impossible due to hard accessibility. It includes the delivery of a repair device through the interior of the pipe and the elimination of product leakage by the patching procedure using an epoxy-impregnated composite sleeve. The technology of trenchless repair of hard-to-reach sections of the damaged pipeline is described in the works by Ahmed and Mourad (2013), Doroshenko et al. (2019), Najafi et al. (2022), Xi et al. (2024), Bondarenko and Doroshenko (2025), Hu et al. (2005), and others. At the stage of developing technologies for repairing thin-walled structural elements using patches and various types of composite coatings, a fundamental question arises of assessing the strength of the restored structure and the feasibility of such repair. Currently, various approaches are known to assess the strength of intact and damaged, as well as restored, shell-like Abstract The technology of trenchless repair of hard-to-reach sections of a damaged pipeline is described. It includes the delivery of a repair device through the interior of the pipe and the elimination of product leakage by the patching procedure using an epoxy-impregnated composite sleeve. The aim of this study is to assess the bearing capacity of a cracked pipe with a repair patch. To investigate the effect of a flexible coating on the strength of a shell with a through crack, we used a cut model with hinged joined edges and the method of singular integral equations. The values of the destructive pressure for a defect-free pipe, for a pipe with a longitudinal crack, and for a patched pipe were calculated. It is shown that in low-pressure networks the integrity of the repair coating is ensured. VIII International Conference “In - service Damage of Materials: Diagnostics and Prediction“ (DMDP 2025) On the estimates of the strength of a damaged pipeline restored by patching Ivan Shatskyi a *, Mykola Makoviichuk a , Robert Bondarenko b , Yaroslav Doroshenko b a Laboratory of Modeling of Damping Systems, Pidstryhach Institute for Applied Problems in Mechanics and Mathematics of the NAS of Ukraine, 3, Mykytynetska Str., Ivano-Frankivsk, 76002, Ukraine b Ivano-Frankivsk National Technical University of Oil and Gas, 15, Karpatska Str., Ivano-Frankivsk, 76019, Ukraine

* Corresponding author. Tel.: +380-99-444-4967. E-mail address: ipshatsky@gmail.com

2452-3216 © 2026 The Authors. Copy from the contract: 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 DMDP 2025 organizers 10.1016/j.prostr.2026.03.041