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A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes

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  • José Renato M. de Sousa
  • Fernando J. M. de Sousa
  • Marcos Q. de Siqueira
  • Luís V. S. Sagrilo
  • Carlos Alberto D. de Lemos

Abstract

This paper focuses on a theoretical approach to access the fatigue life of flexible pipes. This methodology employs functions that convert forces and moments obtained in time-domain global analyses into stresses in their tensile armors. The stresses are then processed by well-known cycle counting methods, and S-N curves are used to evaluate the fatigue damage at several points in the pipe’s cross-section. Finally, Palmgren-Miner linear damage hypothesis is assumed in order to calculate the accumulated fatigue damage. A study on the fatigue life of a flexible pipe employing this methodology is presented. The main points addressed in the study are the influence of friction between layers, the effect of the annulus conditions, the importance of evaluating the fatigue life in various points of the pipe’s cross-section, and the effect of mean stresses. The results obtained suggest that the friction between layers and the annulus conditions strongly influences the fatigue life of flexible pipes. Moreover, mean stress effects are also significant, and at least half of the wires in each analyzed section of the pipe must be considered in a typical fatigue analysis.

Suggested Citation

  • José Renato M. de Sousa & Fernando J. M. de Sousa & Marcos Q. de Siqueira & Luís V. S. Sagrilo & Carlos Alberto D. de Lemos, 2012. "A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes," Journal of Applied Mathematics, Hindawi, vol. 2012, pages 1-29, July.
    • Handle: RePEc:hin:jnljam:983819
    DOI: 10.1155/2012/983819
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    Cited by:

    1. Cullinane, M. & Judge, F. & O'Shea, M. & Thandayutham, K. & Murphy, J., 2022. "Subsea superconductors: The future of offshore renewable energy transmission?," Renewable and Sustainable Energy Reviews, Elsevier, vol. 156(C).
    2. Monique de Carvalho Alves & Fabrício Nogueira Corrêa & José Renato Mendes de Sousa & Breno Pinheiro Jacob, 2024. "A Coupled, Global/Local Finite Element Methodology to Evaluate the Fatigue Life of Flexible Risers Attached to Floating Platforms for Deepwater Offshore Oil Production," Mathematics, MDPI, vol. 12(8), pages 1-29, April.

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