PSI - Issue 77

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 77 (2026) 521–528

© 2026 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 ICSI organizers Keywords: Thermoplastic composite pipe, Thermal gradient, Critical buckling load, Material failure, Finite element analysis. Abstract The study examined the effects of the laminate architecture and geometry on the buckling capacity, material strength and failure of thermoplastic composite pipes (TCPs) under combined thermomechanical loading using finite element (FE) modelling. A validated 3D FE model assessed some TCPs with varied laminate configurations using linear buckling and failure analyses with temperature dependent material properties. Findings indicated the decline in buckling strength with increasing thermal gradient. It was found that at low temperatures failure mode depends on the configuration, while at high temperatures the liner plastic yielding is the dominant mode of failure. Furthermore, TCPs with hybrid laminates mixing low and high angle plies provided the best balance of buckling and material strength. The results presented practical design insights for the temperature resilient TCPs. 1. Introduction In the oil and gas industry, steel pipes are increasingly being replaced by thermoplastic composite pipes (TCP) to reduce weight, eliminate corrosion and reduce lifecycle cost, while improving durability and simplifying installation (Toh et al., 2018). A typical bonded TCP consists of an inner thermoplastic liner, a load bearing fibre reinforced thermoplastic laminate core and an outer layer, forming a fluid tight structure (Hastie et al., 2019). This layered design International Conference on Structural Integrity Numerical modelling of the effects of laminate ply orientation and pipe geometry on thermoplastic composite pipe failure under thermomechanical loading Sunny O. Uguzo a , Oleksandr Menshykov a *, Marina Menshykova a , Maria Kashtalyan a a School of Engineering, Fraser Noble Building, King’s College, University of Aberdeen, Aberdeen, AB24 3 UE, Scotland, UK

* Corresponding author. Tel.: +44-1224-273326 E-mail address: o.menshykov@abdn.ac.uk

2452-3216 © 2026 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 ICSI organizers 10.1016/j.prostr.2026.01.065