Tension-bending analysis of flexible pipe by a repeated unit cell finite element model

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

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Tension-bending analysis of flexible pipe by a repeated unit cell finite element model. / Lukassen, Troels Vestergaard; Gunnarsson, Egil; Krenk, Steen; Glejbøl, Kristian; Lyckegaard, Anders; Berggreen, Christian.

In: Marine Structures, Vol. 64, 2019, p. 401-420.

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

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@article{66c812004a614ce1931783d7c89a1757,
title = "Tension-bending analysis of flexible pipe by a repeated unit cell finite element model",
abstract = "Unbonded flexible pipes consist of multiple subcomponents which interact through frictional contact. A full 3-D finite element analysis of unbonded flexible pipes is computationally expensive, and a more efficient approach for practical engineering purposes is required. This work presents a repeated unit cell (RUC) finite element model for analyzing flexible pipes subjected to combined constant tension and curvature. Periodic boundary conditions reduce the model size by taking advantage of the structural and loading periodicities, and by assuming uniform wire behavior in the armor layer. The RUC model is suitable for resolving the local tensile armor stress distribution and the global pipe response. A flexible pipe is studied with the RUC model for various tension-bending load configurations and the results have been compared with existing analytical models for validation. The study showed strong correlation between the RUC model and the analytical models, with some difference in the wire bending stresses. This difference can to some degree be explained by the difference in the wire kinematics assumptions. It is found that the proposed RUC model is a robust and computationally efficient approach for analyzing flexible pipes.",
keywords = "Flexible pipes, Repeated unit cell, Tensile armor bending stress, Helical layer, Frictional contact, Finite elements",
author = "Lukassen, {Troels Vestergaard} and Egil Gunnarsson and Steen Krenk and Kristian Glejb{\o}l and Anders Lyckegaard and Christian Berggreen",
year = "2019",
doi = "10.1016/j.marstruc.2018.09.010",
language = "English",
volume = "64",
pages = "401--420",
journal = "Marine Structures",
issn = "0951-8339",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Tension-bending analysis of flexible pipe by a repeated unit cell finite element model

AU - Lukassen, Troels Vestergaard

AU - Gunnarsson, Egil

AU - Krenk, Steen

AU - Glejbøl, Kristian

AU - Lyckegaard, Anders

AU - Berggreen, Christian

PY - 2019

Y1 - 2019

N2 - Unbonded flexible pipes consist of multiple subcomponents which interact through frictional contact. A full 3-D finite element analysis of unbonded flexible pipes is computationally expensive, and a more efficient approach for practical engineering purposes is required. This work presents a repeated unit cell (RUC) finite element model for analyzing flexible pipes subjected to combined constant tension and curvature. Periodic boundary conditions reduce the model size by taking advantage of the structural and loading periodicities, and by assuming uniform wire behavior in the armor layer. The RUC model is suitable for resolving the local tensile armor stress distribution and the global pipe response. A flexible pipe is studied with the RUC model for various tension-bending load configurations and the results have been compared with existing analytical models for validation. The study showed strong correlation between the RUC model and the analytical models, with some difference in the wire bending stresses. This difference can to some degree be explained by the difference in the wire kinematics assumptions. It is found that the proposed RUC model is a robust and computationally efficient approach for analyzing flexible pipes.

AB - Unbonded flexible pipes consist of multiple subcomponents which interact through frictional contact. A full 3-D finite element analysis of unbonded flexible pipes is computationally expensive, and a more efficient approach for practical engineering purposes is required. This work presents a repeated unit cell (RUC) finite element model for analyzing flexible pipes subjected to combined constant tension and curvature. Periodic boundary conditions reduce the model size by taking advantage of the structural and loading periodicities, and by assuming uniform wire behavior in the armor layer. The RUC model is suitable for resolving the local tensile armor stress distribution and the global pipe response. A flexible pipe is studied with the RUC model for various tension-bending load configurations and the results have been compared with existing analytical models for validation. The study showed strong correlation between the RUC model and the analytical models, with some difference in the wire bending stresses. This difference can to some degree be explained by the difference in the wire kinematics assumptions. It is found that the proposed RUC model is a robust and computationally efficient approach for analyzing flexible pipes.

KW - Flexible pipes

KW - Repeated unit cell

KW - Tensile armor bending stress

KW - Helical layer

KW - Frictional contact

KW - Finite elements

U2 - 10.1016/j.marstruc.2018.09.010

DO - 10.1016/j.marstruc.2018.09.010

M3 - Journal article

VL - 64

SP - 401

EP - 420

JO - Marine Structures

JF - Marine Structures

SN - 0951-8339

ER -