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The 9th European Congress on Computational Methods in Applied Sciences and Engineering
ECCOMAS Congress 2024
3 – 7 June 2024, Lisbon, Portugal
BUCKLING AND STRESS ANALYSIS FOR COMPOSITE PIPES
UNDER THERMOMECHANICAL LOADING
Oleksandr Menshykov¹, Sunny O. Uguzo², Marina Menshykova³ and Maria Kashtalyan4
1 School of Engineering, University of Aberdeen, AB243UE UK, o.menshykov@abdn.ac.uk
2 School of Engineering, University of Aberdeen, AB243UE UK, s.uguzo.21@abdn.ac.uk
3 School of Engineering, University of Aberdeen, AB243UE UK, m.menshykova@abdn.ac.uk
4 School of Engineering, University of Aberdeen, AB243UE UK, m.kashtalyan@abdn.ac.uk
Key Words: Finite element method, composites, buckling, failure, thermomechanical load
The use of composite materials has increased significantly in the oil and gas industry, due to
properties such as high specific strength and stiffness, high fatigue strength, and good impact
resistance, etc. Composite reinforcement fibres are usually combined with polymer matrix
materials and formed into rigid or flexible lightweight flow lines, risers, transport pipes, etc.
Flexible composite pipes are easier and less costly to install due to their spoolability, hence
their increased implementation for offshore oil and gas production applications.
The use of thermoplastic composite pipes in offshore oil and gas industry presents load regimes
emanating from functional, environmental, and accidental occurrences, which could result in
material level (matrix cracking) or structural level (buckling) failures. Thus, composite pipe
design and selection must include requirements to withstand installation, operational and off-
design conditions. For instance, during operation, the sag bend region of a riser must sustain
deep-water ambient external pressure, high internal pressure, elevated temperatures, and
thermal gradient from inflowing hydrocarbons, bending stress at the curvature, axial loads as
well as loads from off design events such as accidental impact, earthquakes, etc. [1].
The overall aim of the current research is the buckling and stress analysis of composite pipes
under axial, bending and pressure loads for offshore deep-water operation scenarios taking into
account changes of material properties due to the temperature gradients. The finite element
model (ABAQUS) is developed and validated through the comparison with the published
analytical and numerical results [2, 3]. The detailed parametric failure analysis (including
effects of fibre orientation, stacking sequence, magnitude of loading and layer thickness on the
structural performance of the pipe) is given, and it is followed by the buckling analysis.
REFERENCES
[1] S. Kyriakides and E. Corona, Mechanics of Offshore Pipelines; Volume I, 2007.
[2] K. Cox, M. Menshykova, O. Menshykov and I. Guz, Analysis of flexible composites for
coiled tubing applications, Composite Structures, 225: 111118, 2019.
[3] J.C. Hastie, I.A. Guz, and M. Kashtalyan, Effects of thermal gradient on failure of a
thermoplastic composite pipe (TCP) riser leg, International Journal of Pressure Vessels and
Piping, 172: 90–99, 2019.
