Equivalent Layer Approaches to Predict the Bisymmetric Hydrostatic Collapse Strength of Flexible Pipes

J. Sousa, Marcelo K. Protasio, L. Sagrilo
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引用次数: 2

Abstract

The hydrostatic collapse strength of a flexible pipe is largely dependent on the ability of its carcass and pressure armor to resist radial loading and, therefore, its prediction involves an adequate modeling of these layers. Hence, initially, this work proposes a set of equations to estimate equivalent thicknesses and physical properties for these layers, which allows their modeling as equivalent orthotropic cylinders. These equations are obtained by simulating several two-point static ring tests with a three-dimensional finite element (FE) model based on beam elements and using these results to form datasets that are analyzed with a symbolic regression (SR) tool. The results of these analyses are the closed-form equations that best fit the provided datasets. After that, these equations are used in conjunction with a three-dimensional shell FE model and a previously presented analytical model to study the dry and wet hydrostatic collapse mechanisms of a flexible pipe. The predictions of these models agreed quite well with the collapse pressures obtained in experimental tests thus indicating that the use of the equivalent approach is promising.
用等效层法预测柔性管道的双对称静水破坏强度
柔性管道的静水抗塌强度在很大程度上取决于其主体和压力护甲抵抗径向载荷的能力,因此,其预测需要对这些层进行充分的建模。因此,这项工作最初提出了一组方程来估计这些层的等效厚度和物理性质,这使得它们可以作为等效正交各向异性圆柱体进行建模。利用基于梁单元的三维有限元(FE)模型模拟多次两点静态环试验,得到了这些方程,并利用这些结果形成数据集,用符号回归(SR)工具进行分析。这些分析的结果是最适合所提供的数据集的封闭形式方程。然后,将这些方程与三维壳体有限元模型和已有的解析模型相结合,研究了挠性管道的干湿流体静力破坏机理。这些模型的预测与实验测试中得到的崩溃压力相当吻合,从而表明等效方法的使用是有希望的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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