考虑摩擦非线性应力的脐带缆疲劳寿命精确分析研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (24) : 189-194.

论文

卢青针1，杨志勋2，陈金龙3，熊飞宇2，阎军2，岳前进1,2

作者信息 +

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

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

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摘要

针对深水动态钢管脐带缆在波浪荷载以及平台运动作用下引起的疲劳问题，考虑缆体自重导致的平均应力对关键构件钢管疲劳损伤影响，构建疲劳分析模型进行疲劳寿命预估。同时，依据螺旋缠绕结构特征考虑构件间相互接触摩擦非线性效应给出了脐带缆基本力学行为的应力求解方法。以我国南海某1500m水深的动态脐带缆为例进行分析，结果表明：只考虑无滑动时的局部应力得到的疲劳寿命过分偏于保守，而只采用全滑动时的局部应力得到的疲劳寿命则偏大很多。在疲劳寿命预估模型中考虑非线性局部应力作为输入可以得到更为准确的寿命估计。

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.

导出引用

卢青针1，杨志勋2，陈金龙3，熊飞宇2，阎军2，岳前进1,2. 考虑摩擦非线性应力的脐带缆疲劳寿命精确分析研究[J]. 振动与冲击, 2018, 37(24): 189-194

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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