Flexible pipes can be used as risers, jumpers, and flowlines that may be subject to axial forces and out-of-plane bending motion due to operational and environmental loading conditions. The tensile armor wires provide axial stiffness to resist these loads. Antibirdcaging tape is used to provide circumferential support and prevent a loss of stability for the tension armor wires, in the radial direction. The antibirdcaging tape may be damaged where a condition known as “wet annulus” occurs that may result in the radial buckling (i.e., birdcaging mechanism) of the tensile armor wires. A three-dimensional continuum finite element (FE) model of a 4 in. flexible pipe is developed using abaqus/implicit software package. As a verification case, the radial buckling response is compared with similar but limited experimental work available in the public domain. The modeling procedures represent an improvement over past studies through the increased number of layers and elements to model contact interactions and failure mechanisms. A limited parameter study highlighted the importance of key factors influencing the radial buckling mechanism that includes external pressure, internal pressure, and damage, related to the percentage of wet annulus. The importance of radial contact pressure and shear stress between layers was also identified. The outcomes may be used to improve guidance in the engineering analysis and design of flexible pipelines and to support the improvement of recommended practices.
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June 2016
Research-Article
Radial Buckling of Tensile Armor Wires in Subsea Flexible Pipe—Numerical Assessment of Key Factors
Alireza Ebrahimi
,
Alireza Ebrahimi
Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
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Shawn Kenny
,
Shawn Kenny
Department of Civil and Environmental
Engineering,
Faculty of Engineering and Design,
Carleton University,
Ottawa, ON K1S 5B6, Canada
Engineering,
Faculty of Engineering and Design,
Carleton University,
Ottawa, ON K1S 5B6, Canada
Search for other works by this author on:
Amgad Hussein
Amgad Hussein
Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
Search for other works by this author on:
Alireza Ebrahimi
Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
Shawn Kenny
Department of Civil and Environmental
Engineering,
Faculty of Engineering and Design,
Carleton University,
Ottawa, ON K1S 5B6, Canada
Engineering,
Faculty of Engineering and Design,
Carleton University,
Ottawa, ON K1S 5B6, Canada
Amgad Hussein
Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
Memorial University of Newfoundland,
St. John's, NL A1B 3X5, Canada
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received May 20, 2015; final manuscript received February 14, 2016; published online April 6, 2016. Assoc. Editor: Myung Hyun Kim.
J. Offshore Mech. Arct. Eng. Jun 2016, 138(3): 031701 (8 pages)
Published Online: April 6, 2016
Article history
Received:
May 20, 2015
Revised:
February 14, 2016
Citation
Ebrahimi, A., Kenny, S., and Hussein, A. (April 6, 2016). "Radial Buckling of Tensile Armor Wires in Subsea Flexible Pipe—Numerical Assessment of Key Factors." ASME. J. Offshore Mech. Arct. Eng. June 2016; 138(3): 031701. https://doi.org/10.1115/1.4032894
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