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首页> 外文期刊>Applied Ocean Research >Numerical study on the axial-torsional response of an unbonded flexible riser with damaged tensile armor wires
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Numerical study on the axial-torsional response of an unbonded flexible riser with damaged tensile armor wires

机译：损坏拉伸铠装线的未粘结柔性立管轴向扭转响应的数值研究

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摘要

The local mechanical response of a 2.5 '' unbonded flexible riser with damaged wires is studied by a nonlinear finite element (FE) model. Firstly, the riser was supposed to be under pure tension and pure torsion. Stiffness and force distribution of the intact riser predicted by the analytical and numerical models are compared, and deviations between the two solutions are discussed. Then, two up to eight wires in the outer tensile armor layer are assumed to be damaged. Numerical results indicate that uneven deformations caused by the broken wires result in a clear nonlinear force redistribution among the outer wires. The maximum and minimum forces supported by the remaining intact outer wires are closely related to the number of damaged wires, boundary conditions and the load direction. Finally, the effect of internal frictions on the load recovery of damaged wires is studied by increasing the FE model length and applying the pre-pressure. It was found that damaged wires can progressively recover their load-carrying capacities with the increase of internal frictions. In addition to the boundary effects, axial stress of the damaged wire is linear with the length of the riser, which indicates that results obtained from the short model can be employed to estimate the load recovery characteristics of the long model.
机译：通过非线性有限元（FE）模型研究了2.5''未粘合的柔性立管的局部机械响应。首先，提升者应该是纯张力和纯扭转。比较分析和数值模型预测的完整立管的刚度和力分布，并讨论了两种解决方案之间的偏差。然后，假设外部拉伸铠装层中的两个最多八根线被损坏。数值结果表明，由断线引起的不均匀变形导致外线之间的透明非线性力再分配。剩余完整的外线支撑的最大和最小力与损坏的线，边界条件和负载方向密切相关。最后，通过增加Fe模型长度并施加预压力，研究了内部摩擦对损坏导线负荷回收的影响。有人发现，随着内部摩擦的增加，损坏的线可以逐渐恢复其承载能力。除了边界效应之外，损坏的线的轴向应力是线性的，具有提升器的长度，这表明可以采用从短模型获得的结果来估计长型的负载恢复特性。

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