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Frictional effect on circular armour wire lateral buckling in umbilicals
Ocean Engineering ( IF 5 ) Pub Date : 2020-12-29 , DOI: 10.1016/j.oceaneng.2020.108306
Xiaotian Li , Murilo Augusto Vaz

The present paper addresses the frictional effect on the circular armour wire lateral buckling in an umbilical for wet annulus condition. A nonlinear static finite element model is developed where only one single circular armour wire is simulated and the contact interface with the neighboring layer is represented by a deformable rigid toroid surface. The isotropic Coulomb friction model regularized with an elastic domain is implemented to simulate the shear interaction. Case studies are carried out by applying different axial compression and cyclic bending curvatures between zero and a maximum value in one bending direction. The minimal axial compression that may cause the armour wire lateral buckling after numerous bending cycles is approximately estimated by fitting the numbers of bending cycles to initiate the buckling under different axial compression through an empirical model. The friction coefficient and the maximum elastic slip employed in the Coulomb friction model are varied for the parametric studies, and their effects on the armour wire sticking-slipping status, the end shortenings and deflections in cyclic bending, the critical lateral buckling limit, as well as the stress state at the onset of lateral buckling are extensively discussed.



中文翻译:

摩擦对脐带缆圆形铠装线横向屈曲的影响

本文研究了在湿环空条件下脐带对圆形铠装线横向屈曲的摩擦效应。建立了非线性静态有限元模型,其中仅模拟了一根圆形铠装线,并且与相邻层的接触界面由可变形的刚性环面表示。用弹性域对正则各向同性库仑摩擦模型进行了模拟,以模拟剪切相互作用。通过在一个弯曲方向上在零和最大值之间应用不同的轴向压缩和循环弯曲曲率来进行案例研究。可以通过经验模型拟合通过在不同轴向压缩条件下引发弯曲的弯曲周期数来近似估计在多次弯曲周期后可能导致铠装线横向弯曲的最小轴向压缩。库仑摩擦模型中采用的摩擦系数和最大弹性滑移因参数研究而异,它们对铠装钢丝的粘滑状态,循环弯曲的末端缩短和挠曲,临界的横向屈曲极限以及由于侧向屈曲开始时的应力状态被广泛讨论。

更新日期:2020-12-29
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