A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes
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 me...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Journal of Applied Mathematics |
| Online Access: | http://dx.doi.org/10.1155/2012/983819 |
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| author | José Renato M. de Sousa Fernando J. M. de Sousa Marcos Q. de Siqueira Luís V. S. Sagrilo Carlos Alberto D. de Lemos |
| author_facet | José Renato M. de Sousa Fernando J. M. de Sousa Marcos Q. de Siqueira Luís V. S. Sagrilo Carlos Alberto D. de Lemos |
| author_sort | José Renato M. de Sousa |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-a2ec1cca0c084f42b1d6f2b8b1f25dc6 |
| institution | OA Journals |
| issn | 1110-757X 1687-0042 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Applied Mathematics |
| spelling | doaj-art-a2ec1cca0c084f42b1d6f2b8b1f25dc62025-08-20T02:20:30ZengWileyJournal of Applied Mathematics1110-757X1687-00422012-01-01201210.1155/2012/983819983819A Theoretical Approach to Predict the Fatigue Life of Flexible PipesJosé Renato M. de Sousa0Fernando J. M. de Sousa1Marcos Q. de Siqueira2Luís V. S. Sagrilo3Carlos Alberto D. de Lemos4Programa de Engenharia Civil (PEC), COPPE/UFRJ, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, BrazilPrograma de Engenharia Civil (PEC), COPPE/UFRJ, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, BrazilPrograma de Engenharia Civil (PEC), COPPE/UFRJ, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, BrazilPrograma de Engenharia Civil (PEC), COPPE/UFRJ, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, BrazilCentro de Pesquisas da Petrobras (CENPES), Cidade Universitária, Quadra 7, Ilha do Fundão, 21949-900 Rio de Janeiro, RJ, BrazilThis 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.http://dx.doi.org/10.1155/2012/983819 |
| spellingShingle | José Renato M. de Sousa Fernando J. M. de Sousa Marcos Q. de Siqueira Luís V. S. Sagrilo Carlos Alberto D. de Lemos A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes Journal of Applied Mathematics |
| title | A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes |
| title_full | A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes |
| title_fullStr | A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes |
| title_full_unstemmed | A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes |
| title_short | A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes |
| title_sort | theoretical approach to predict the fatigue life of flexible pipes |
| url | http://dx.doi.org/10.1155/2012/983819 |
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