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Finite Element Investigation on the Tensile Armour Wire Response of Flexible Pipe for Axisymmetric Loading Conditions Using an Implicit Solver

[+] Author and Article Information
Alireza Ebrahimi

Faculty Engineering and Applied Science, Memorial University of Newfoundland, 240 Prince Philip Drive, A1B 3X5, St. John's, NL, Canada
ae0046@mun.ca

Shawn Kenny

Department of Civil and Environmental Engineering, Faculty of Engineering and Design, Carleton University, 1112 Colonel By Drive, K1S 5B6, Ottawa, ON, Canada
shawn.kenny@carleton.ca

Amgad Hussein

Faculty Engineering and Applied Science, Memorial University of Newfoundland, 240 Prince Philip Drive, A1B 3X5, St. John's, NL, Canada
ahussein@mun.ca

1Corresponding author.

ASME doi:10.1115/1.4039132 History: Received July 11, 2015; Revised January 19, 2018

Abstract

omposite flexible pipe is used in the offshore oil and gas industry for the transport of hydrocarbons, jumpers connecting subsea infrastructure, and risers with surface platforms and facilities. Although the material fabrication costs are high, there are technical advantages with respect to installation and performance envelope (e.g. fatigue). Flexible pipe have a complex, composite section with each layer addressing a specific function (e.g. pressure containment, axial load). Continuum finite element modelling procedures are developed to examine the mechanical response of an unbonded flexible pipe subject to axisymmetric loading conditions. A parameter study examined the effects of: (1) pure torsion, (2) interlayer friction factor, (3) axial tension, and (4) external and internal pressure on the pipe mechanical response. The results demonstrated a coupled global-local mechanism with a bifurcation path for positive angles of twist relative to the tensile armour wire pitch angle. These results indicated idealized analytical and structural-based numerical models may be incomplete or may provide an accurate prediction of the pipe mechanical response. The importance of using an implicit solver to predict the bifurcation response, and simulate contact mechanics between layers was highlighted.

Copyright (c) 2018 by ASME
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