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The stresses are then processed by well\u2010known cycle counting methods, and<jats:italic>S-N<\/jats:italic>curves are used to evaluate the fatigue damage at several points in the pipe\u2019s cross\u2010section. Finally, Palmgren\u2010Miner 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\u2019s cross\u2010section, 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.<\/jats:p>","DOI":"10.1155\/2012\/983819","type":"journal-article","created":{"date-parts":[[2012,7,27]],"date-time":"2012-07-27T03:13:00Z","timestamp":1343358780000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes"],"prefix":"10.1155","volume":"2012","author":[{"given":"Jos\u00e9 Renato M.","family":"de Sousa","sequence":"first","affiliation":[]},{"given":"Fernando J. M.","family":"de Sousa","sequence":"additional","affiliation":[]},{"given":"Marcos Q.","family":"de Siqueira","sequence":"additional","affiliation":[]},{"given":"Lu\u00eds V. 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