PSI - Issue 82

Igor Guz et al. / Procedia Structural Integrity 82 (2026) 239–245 I. Guz et al./ Structural Integrity Procedia 00 (2026) 000–000

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5. Conclusions FE modelling is shown to be a robust method for the analysis of stresses in thick-walled composite sandwich pipe under thermomechanical loading when compared to the analytical solution. As an example analysis, sandwich pipes comprising FW carbon/epoxy skins with homogeneous epoxy, homogeneous PVC or graded-density PVC cores were simulated under combined pressures and thermal loads relevant to deepwater piping applications. Utilising a low-density foam core leads to significant stresses in the outer skin especially at high pressure. Grading the density of the core can be used as a compromise between lighter and heavier counterparts. References Bakaiyan, H., Ameri, E., 2012. Thermomechanical analysis of filament-wound sandwich pipes under combined internal pressure and temperature gradient. International Conference on Mechanics of Nano, Micro and Macro Composite Structures. Turin, Italy, 18-20 June 2012. Cox, K., Menshykova, M., Menshykov, O., Guz, I.A., 2019. Analysis of flexible composites for coiled tubing applications. Composite Structures 225, paper 111118. Diab, 2022. Technical Data Divinycell HP. Hastie, J.C., Guz, I.A., Kashtalyan, M., 2019a. Effects of thermal gradient on failure of a thermoplastic composite pipe (TCP) riser leg. International Journal of Pressure Vessels and Piping 172, 90-99. Hastie, J.C., Guz, I.A., Kashtalyan, M., 2022. Numerical modelling of spoolable thermoplastic composite pipe (TCP) under combined bending and thermal load. Ships and Offshore Structures 17(9), 1975-1986. Hastie, J.C., Kashtalyan, M., Guz, I.A., 2019b. Failure analysis of thermoplastic composite pipe (TCP) under combined pressure, tension and thermal gradient for an offshore riser application. International Journal of Pressure Vessels and Piping 178, article 103998. Hastie, J.C., Kashtalyan, M., Guz, I.A., 2021. Analysis of filament-wound sandwich pipe under combined internal pressure and thermal load considering restrained and closed ends. International Journal of Pressure Vessels and Piping 191, article 104350. Kennedy, J.L., 1993. Oil and Gas Pipeline Fundamentals. Tulsa, OK: PennWell. Wang, T., Menshykova, M., Menshykov, O., Guz, I.A., Bokedal, N.K., 2023. Mechanical analysis of thick‑walled filament wound composite pipes under pure torsion load: safety zones and optimal design. Applied Composite Materials 30(2), 485–505. Xia, M., Kemmochi, K., Takayanagi, H., 2000. Analysis of filament-wound sandwich pipe under internal pressure. Advanced Composite Materials 9(3), 223- 239. Xia, M., Kemmochi, K., Takayanagi, H., 2001a. Analysis of filament-wound fiber-reinforced sandwich pipe under combined internal pressure and thermomechanical loading. Composite Structures 51(3), 273-283. Xia, M., Takayanagi, H., Kemmochi, K., 2001b. Analysis of multi-layered filament- wound composite pipes under internal pressure. Composite Structures 53(4), 483- 491. Xia, M., Takayanagi, H., Kemmochi, K., 2002. Bending behavior of filament-wound fiber-reinforced sandwich pipes. Composite Structures 56(2), 201-210.