Generally, the marine drilling riser is subjected to cyclic loads of wavecurrentin the working conditions. The fatigue damage, which is one ofthe challenges in riser design and operation, is of great significance toensure the safety of the marine drilling riser. In this paper, the timedomainnonlinear dynamic analysis approach of fatigue damage ispresented based on the wave theory and the differential equation. Inaddition, the fatigue damage model is established on the rain flowcounting method, the S-N curve and the Miner linear cumulative damagemethod. Analysis results show that the bending moment located at thetop is bigger than any part of the riser, while the maximum fatiguedamage occurs at the bottom of the riser, where it connects with theBOPs/LMRP. Moreover, the fatigue life decreases with the wave height.The result has guiding significance for the design and operation of themarine drilling riser.
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