A study on fatigue life prediction of umbilicals with consideration of friction non-linear stress

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (24) : 189-194.

LU Qingzhen1,YANG Zhixun2,CHEN Jinlong3,XIONG Feiyu2,YAN Jun2,YUE Qianjin1,2

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Abstract

The fatigue problem of dynamic umbilicals induced by wave load and floater movement in deepwater was studied.The prediction method of the fatigue life was established by considering the influence of mean stress due to self-weight on fatigue damage of key component steel tube.Solution of non-linear local stress was presented under basic mechanical behaviors of helical wound structure with consideration of contact and friction between components of the umbilical.A case study of a dynamic umbilical for 1 500 meters depth in South China Sea was presented.The results show that the more accurate result of the fatigue life was calculated through Goodman correction and non-linear local stress.The fatigue life by considering local stress with no-slip assumption was conservative.An obviously longer fatigue life was obtained by considering local stress with full-slip assumption.

Key words

Umbilical cable / Goodman correction / Fatigue life / Contact and friction / Non-linear stress

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LU Qingzhen1,YANG Zhixun2,CHEN Jinlong3,XIONG Feiyu2,YAN Jun2,YUE Qianjin1,2. A study on fatigue life prediction of umbilicals with consideration of friction non-linear stress[J]. Journal of Vibration and Shock, 2018, 37(24): 189-194

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