A finite element methodology for birdcaging analysis of flexible pipes with damaged outer layers |
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| Institution: | 1. School of Ocean Engineering and Technology, Sun Yat-Sen University, Zhuhai, China;2. Ocean Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;3. Petrobras, CENPES, Rio de Janeiro, Brazil;1. Department of Civil and Environmental Engineering, Centre for Offshore Research and Engineering, National University of Singapore, 117576, Singapore;2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China;3. Department of Structural Engineering, Tongji University, Shanghai, 200092, China;1. School of AI Convergence, Sungshin Women''s University, 2, Bomun-Ro 34da-gil, Seongbuk-Gu, Seoul, 02844, Republic of Korea;2. Department of Naval Architecture and Ocean Engineering, Seoul National University, 599 Gwanak-Ro, Gwanak-Gu, Seoul, 08826, Republic of Korea;1. Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan, 430063, PR China;2. Departments of Naval Architecture, Ocean and Structural Engineering, School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan, 430063, PR China;3. Sanya Science and Education Innovation Park of Wuhan University of Technology, Sanya, 572025, PR China;1. Applied Mechanics Group (GMAP), Federal University of Rio Grande do Sul (UFRGS), Sarmento Leite 425, Porto Alegre, Brazil;2. Physical Metallurgy Laboratory (LAMEF), Federal University of Rio Grande do Sul (UFRGS), Av. Bento Goncalves, 9500, prédio 43820, Porto Alegre, Brazil;3. Equinor ASA, Equinor. Arkitekt Ebbells veg 10, Trondheim, 7053 Ranheim, Norway |
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| Abstract: | Flexible pipes are commonly exposed to damages on the outer layers due to abrasion with seafloor or improper installation and operation, which may render them vulnerable to birdcaging failures. This paper presents a finite element model for the residual axial compressive strength evaluation of a flexible pipe with local damage on the outer layers. The elastoplastic nonlinearity of tensile armour steel layers and hyperelasticity of polymeric outer sheath are taken into account. This model is verified against existing test data. Parametric studies are then performed by varying the damage size in either the pipe axial or circumferential directions. The flexible pipe axial resistance, deformations, as well as the tensile armour wires layers stress states near the damaged section under different damage and axial compression conditions are discussed. The case studies show that damage on the outer layer, especially the anti-birdcage tape layer, is highly detrimental to flexible pipe residual strength against axial compression. The present results and discussions are instructive in understanding the flexible pipe birdcaging mechanism. |
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| Keywords: | Flexible pipes Birdcaging Finite element methodology |
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