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An accurate and computationally efficient small-scale nonlinear FEA of flexible risers

机译：柔性立管的精确且计算效率高的小规模非线性有限元分析

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This paper presents a highly efficient small-scale, detailed finite-element modelling method for flexible risers which can be effectively implemented in a fully-nested (FE2) multistate analysis based on computational homogenisation. By exploiting cyclic symmetry and applying periodic boundary conditions, only a small fraction of a flexible pipe is used for a detailed nonlinear finite-element analysis at the small scale. In this model, using three-dimensional elements, all layer components are individually modelled and a surface-to-surface frictional contact model is used to simulate their interaction. The approach is applied on a 5-layered pipe made of inner, outer and intermediate polymer layers and two intermediate armour layers, each made of 40 steel tendons. The capability of the method in capturing the detailed nonlinear effects and the great advantage in terms of significant CPU time saving are demonstrated by comparing the results obtained on elements of pipe of different lengths, equal to one pitch length L-p as well as L-p/5, L-p/20 and L-p/40. (C) 2016 Published by Elsevier Ltd.
机译：本文提出了一种用于挠性立管的高效小规模，详细的有限元建模方法，该方法可以在基于计算均化的全嵌套（FE2）多状态分析中有效实施。通过利用循环对称性并应用周期性边界条件，仅将一小部分挠性管用于小规模的详细非线性有限元分析。在此模型中，使用三维元素，对所有层组件进行单独建模，并使用表面间摩擦接触模型来模拟它们之间的相互作用。该方法应用于由内部，外部和中间聚合物层以及两个中间铠装层（每个均由40条钢腱制成）制成的5层管道上。通过比较在不同长度（等于一个节距长度Lp和Lp / 5的管道）上获得的结果，证明了该方法捕获详细非线性效应的能力以及在节省大量CPU时间方面的巨大优势。 Lp / 20和Lp / 40。 （C）2016由Elsevier Ltd.出版

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