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Ultimate strain capacity assessment of local buckling of pipelines with kinked dents subjected to bending loads

机译：对弯曲损伤的扭转凹痕局部屈曲的最终应变能力评估

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摘要

A dent is a typical defect found in oil and gas pipelines and poses a significant threat to their safety and integrity. In this study, the buckling behavior and limit strain capacity of pipelines with kinked dents under bending moment loads were investigated. First, four-point bending tests of full-scale pipelines with kinked dents were conducted in a laboratory, and the critical buckling load and strain response of the pipelines during buckling failure were tested. The test results revealed that the existence of kinked dents, specifically those with large depths, could weaken the bending resistance of the pipelines. During the buckling process of the pipeline, a considerable compressive strain was generated at the bottom center of the dent, which was considerably higher than the strain value at the corresponding position of the intact pipeline. However, the strain at both axial sides of the dent gradually changed from compressive strain at the initial bending stage to tensile strain after buckling failure. Then, nonlinear finite element (FE) models of buckling failure for pipelines with kinked dents under bending moment loads were developed, and the reliability of the FE models was verified through comparison with the test results. In addition, a parametric sensitivity study was conducted to determine the effect of parameters, such as dent depth, dent angle, diameter-to-thickness ratio of the pipe, and yield ratio of the pipe steel, on the compressive strain capacity of the pipeline. Finally, based on a large number of FE simulation results, a model for predicting the buckling compressive strain capacity of pipelines with kinked dents was developed, which can be used for evaluating buckling instability failure of pipelines with kinked dents subjected to bending moment loads.
机译：凹痕是油气管道中发现的典型缺陷，对其安全性和完整性构成了重大威胁。在该研究中，研究了弯曲力矩载荷下具有扭结凹槽管道的屈曲行为和限制应变能力。首先，在实验室中进行了具有扭结凹痕的四点弯曲试验，并在实验室中进行了屈曲失效期间管道的关键屈曲载荷和应变响应。测试结果表明，扭结的凹痕，特别是具有大深度的凹痕可以削弱管道的弯曲性。在管道的屈曲过程中，在凹痕的底部中心产生相当大的压缩菌株，其显着高于完整管道的相应位置处的应变值。然而，在弯曲故障后，凹痕的两个轴向侧面的轴向侧面的突变逐渐从压缩突变变为拉伸应变。然后，开发了非线性有限元（FE）管道弯曲失败的弯曲失败的模型，弯曲时刻负载下的扭结凹痕，通过与测试结果进行比较来验证FE模型的可靠性。此外，进行了参数敏感性研究以确定参数，例如凹陷深度，凹痕角度，管材直径到厚度比的参数，以及管钢的屈服比，以及管道的屈服比。 。最后，基于大量的FE模拟结果，开发了一种预测管道管道的屈曲压缩应变能力的模型，可用于评估管道的屈曲不稳定失效，并进行弯曲力矩载荷。

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  • 来源
    《Thin-Walled Structures》 |2021年第12期|108369.1-108369.17|共17页
  • 作者

    Wang Junqiang; Shuai Yi; He Renyang; Dou Xiran; Zhang Ping; Feng Can;

  • 作者单位

    China Special Equipment Inspect & Res Inst Technol Innovat Ctr Oil & Gas Pipeline & Storage Beijing 100029 Peoples R China;

    Beijing Univ Technol Fac Mat & Mfg Beijing 100124 Peoples R China;

    China Special Equipment Inspect & Res Inst Technol Innovat Ctr Oil & Gas Pipeline & Storage Beijing 100029 Peoples R China;

    China Special Equipment Inspect & Res Inst Technol Innovat Ctr Oil & Gas Pipeline & Storage Beijing 100029 Peoples R China|Wuhan Jinzhong PetroChem Engn Co Ltd Wuhan 430223 Peoples R China;

    China Special Equipment Inspect & Res Inst Technol Innovat Ctr Oil & Gas Pipeline & Storage Beijing 100029 Peoples R China;

    Pipechina Southwest Pipeline Co Chengdu 610041 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pipelines; Kinked dent; Buckling; Modeling studies; Failure analysis; Integrity assessment;

    机译：管道;扭结的凹痕;屈曲;建模研究;失败分析;完整性评估;

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