非粘结钢管脐带缆弯曲滞回参数敏感性分析

Parametric Sensitivity Analysis of Unbonded Steel Cable’S Bending Hysteresis

本文基于ABAQUS有限元软件,建立非粘结钢管脐带缆的三维有限元模型计算其弯曲刚度,将弯曲刚度的数值模拟与理论结果进行对比,验证了模型的正确性,在此基础上逐一分析了摩擦系数、外压大小、螺旋角度等敏感性参数变化以及填充单元对弯曲迟滞性能的影响。研究结果表明,随摩擦系数和外压大小的增大非粘结钢管脐带缆全滑移阶段和滞回阶段弯曲刚度明显增加,而随螺旋角度增加两阶段弯曲刚度则是呈减小趋势。此外,填充单元对两阶段弯曲刚度的影响与摩擦系数的大小有关。

Unbonded steel cable is a common form of cable connecting oil production platform and subsea oil well,which is composed of internal functional pipe fitting layer and external sheath layer.The bending stiffness is an important index to measure the bending performance of umbilical cable,and it is also the premise for the overall dynamic analysis of the umbilical cable.The bending moment of unbonded steel tube umbilical cable lags behind the curvature due to the friction and slip of internal pipe fittings.In this paper,based on ABAQUS finite element software,a three-dimensional finite element model of unbonded steel tube umbilical cable is established to calculate its bending stiffness.The correctness of the model is verified by comparing the numerical simulation of bending stiffness with the theoretical results.On this basis,the influence of sensitive parameters such as friction coefficient,external pressure and screw angle on bending hysteresis is analyzed one by one.Finally,the influence of the filled element on the bending hysteresis is analyzed and compared.The results show that with the increase of friction coefficient and external pressure,the bending stiffness of unbonded steel tube umbilical cable increases obviously in the whole slip stage and hysteretic stage,however,with the increase of screw angle,the two-stage bending stiffness decreases.In addition,the effect of the filling element on the two-stage bending stiffness is related to the friction coefficient.