脐带缆铠装钢丝径向屈曲失效数值模拟及参数敏感性分析

Numerical Simulation and Parameter Sensitivity Analysis of Radial Buckling Failure of Umbilical Armored Steel Wire

针对海洋工程脐带缆铠装钢丝径向屈曲失效,建立三维简化有限元模型进行螺旋缠绕结构的径向屈曲模拟分析。以我国某海域典型脐带缆为例,得到单倍螺距下单根铠装钢丝径向屈曲失效临界载荷。探究不同敏感参数对单根铠装钢丝临界屈曲载荷的影响,发现铠装钢丝螺旋角度、截面惯性矩、螺旋缠绕半径与临界载荷分别大致呈抛物线形、线性、负指数关系,该结论可为脐带缆铠装抗屈曲设计提供参考。同时发现,通过单根铠装钢丝临界载荷累加的方式可近似得到相应根数螺旋铠装钢丝的临界屈曲载荷,该载荷可作为求解真实脐带缆单层铠装径向临界屈曲载荷的保守估算值。

Aiming at the radial buckling failure of the umbilical armored steel wire in marine engineering, a 3D simplified finite element model is established to simulate the radial buckling of the helically wound structure. Taken a typical umbilical in a sea area of China as an example, the radial buckling failure critical load of the single armored steel wire with single pitch is obtained. The influence of different sensitive parameters on the critical buckling load of the single armored steel wire is studied. It is found that the relationships of helically angle of the armored steel wire, section moment of inertia, helically winding radius with the critical load are roughly parabolic, linear and negative exponential, respectively. This conclusion will provide reference for the buckling resistance design of the umbilical armored steel wire. It is found that the critical buckling load of the helically armored steel wires with the corresponding number can be approximately obtained by the accumulation of the critical load of a single armored steel wire, which can be used as a conservative estimate for solving the radial critical buckling load of real umbilical with single armored steel wire.