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Finite element analyses of corroded pipeline with single defect subjected to internal pressure and axial compressive stress
Marine Structures ( IF 3.9 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.marstruc.2020.102746
Thibankumar Arumugam , Saravanan Karuppanan , Mark Ovinis

Abstract This paper describes the application of finite element method (FEM) and the development of equations to predict the failure pressure of single corrosion affected pipes subjected to internal pressure and axial compressive stress. The finite element analysis (FEA) results were verified against full-scale burst tests and theoretical calculations. Material non-linearity, which allow for large strains and displacements, were considered. In addition, true UTS instead of engineering UTS was used to determine the point of failure. The pipes used in the FEA was modelled based on API 5L X52 modified steel with a length of 2000 mm, a nominal outer diameter of 300 mm, and a nominal wall thickness of 10 mm. The results obtained from FEA were compared to that of existing comprehensive corrosion assessment method, known as DNV-RP-F101. Six equations, utilizing the Buckingham's π theorem and multivariate non-linear regression techniques, were developed for predicting the failure pressure of corroded pipeline with single defect subjected to both internal pressure and axial compressive stress. These equations provide improved failure pressure predictions with good margins of errors (less than 10%).

中文翻译:

内压和轴向压应力作用下单缺陷腐蚀管道的有限元分析

摘要 本文描述了有限元方法(FEM)的应用和方程的发展,以预测受内压和轴向压应力作用的单一腐蚀影响管道的破坏压力。有限元分析 (FEA) 结果通过全尺寸爆破测试和理论计算得到验证。考虑了允许大应变和位移的材料非线性。此外,使用真正的 UTS 而不是工程 UTS 来确定故障点。FEA 中使用的管道基于 API 5L X52 改性钢建模,长度为 2000 毫米,公称外径为 300 毫米,公称壁厚为 10 毫米。将从 FEA 获得的结果与现有的综合腐蚀评估方法(称为 DNV-RP-F101)进行比较。六个方程,利用白金汉 π 定理和多元非线性回归技术,开发了用于预测受内压和轴向压应力作用下具有单一缺陷的腐蚀管道的破坏压力。这些方程提供了改进的故障压力预测,并具有良好的误差范围(小于 10%)。
更新日期:2020-07-01
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