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1 Polish Maritime Research

1 2017

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Fatigue life prediction of umbilicals considering non-linear stress

Lu Q., Yin Y., Yang Z., Chen J., Yan J., Yue Q.

Polish Maritime Research

2017

S 2

154--163

The fatigue problem induced by wave loads and floater movements of dynamic umbilicals in deepwater is studied. The prediction method of the fatigue life is investigated by considering no-linear local stress due to contact and friction between components of the umbilical. A case study of a dynamic umbilical for 1500 meters depth in South China Sea was presented. The results showed that the more accurate result of the fatigue life was calculated by considering non-linear local stress. The fatigue life by considering local stress with the no-slip assumption was conservative. An obviously longer fatigue life was obtained by considering local stress with the full-slip assumption.