基于有限元方法的柔性立管防弯器疲劳寿命分析  

Fatigue life of flexible riser bend stiffener based on finite element method

作　　者：刘军鹏[1] 齐华林 罗晓兰[2] 张振兴[3] 张涛[2] LIU Junpeng;QI Hualin;LUO Xiaolan;ZHANG Zhenxing;ZHANG Tao(College of Safety and Ocean Engineering,China University of Petroleum,Beijing 102249,China;College of Mechanical and Transportation Engineering,China University of Petroleum,Beijing 102249,China;Offshore Oil Engineering Co.,Ltd.,Tianjin 300450,China)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102249 [2]中国石油大学(北京)机械与储运工程学院,北京102249 [3]海洋石油工程股份有限公司,天津300450

出　　处：《海洋工程》2021年第3期141-147,共7页The Ocean Engineering

基　　金：国家重点研发计划课题———深海结构物监测集成技术研究(2018YFC0310504)。

摘　　要：防弯器是柔性管系统中的一个关键附件,其与柔性立管相互作用带来的非线性问题使得预测其疲劳寿命十分困难。以南海某油田柔性立管防弯器为例,采用ABAQUS建立了柔性立管与防弯器的“管中管”分析模型,模型中考虑了两者之间的间隙和滑动摩擦,以及材料非线性和接触非线性等因素。在加载方式上利用“位移”载荷取代传统的“力—角度”载荷,更符合工程实际。利用防弯器材料的ε⁃N疲劳试验曲线,结合防弯器的应力分析结果,得到危险截面的疲劳寿命。考虑材料非线性的管中管模型和疲劳寿命的计算方法,可为今后运动监测数据的利用和防弯器的优化设计提供借鉴。Bend stiffener is a key accessory in flexible riser system.It is hard to predict its fatigue life due to the interaction between bend stiffener and flexible riser.Based on a flexible riser bend stiffener used in a certain field of the South China Sea,we established a pipe⁃in⁃pipe model through ABAQUS,where some nonlinear factors like the gap or sliding friction between bend stiffener and flexible riser,geometrical nonlinear and contact nonlinear factors are considered.Meanwhile,a new way of loading displacement load was proposed.Consequently,the fatigue life of dangerous sections was obtained by theε⁃N fatigue test curve of the bend stiffener material.The pipe⁃in⁃pipe model,a new loading method,and calculated fatigue life results can lay the foundation for the future use of motion monitoring data and the design of better⁃performance bend stiffener.

关 键 词：柔性管 防弯器 管中管模型 疲劳寿命预测 ε⁃N曲线 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]