石油化工高等学校学报

石油化工高等学校学报

• 油气储运 • 上一篇    下一篇

基于有限元分析的管道腐蚀缺陷生长预测模型

孙东旭1,2， 吴明1,2， 谢飞1， 王阳3   

  1. 1. 辽宁石油化工大学 石油天然气工程学院，辽宁 抚顺 113001； 2. 中国石油大学(华东) 储运与建筑工程学院，山东 青岛 266580； 3. 中国石油大连石化分公司，辽宁 大连 116031
  • 收稿日期:2019-08-14 修回日期:2019-09-02 出版日期:2020-02-28 发布日期:2020-03-05
  • 通讯作者: 吴明（1961⁃），男，博士，教授，博士生导师，从事管道完整性方面的研究；E⁃mail：wuming0413@163.com。
  • 作者简介:孙东旭（1991?），男，博士研究生，从事油气管道腐蚀与防护方面的研究；E?mail：dx_sun@yahoo.com。
  • 基金资助:
    国家自然科学基金项目（51574147；50771053）。

Prediction Model of Corrosion Defect Growth on Pipeline Based on Finite Element Analysis

Sun Dongxu1,2， Wu Ming1,2， Xie Fei1， Wang Yang3   

  1. 1. College of Petroleum Engineering, Liaoning Shihua University, Fushun Liaoning 113001,China ； 2. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao Shandong 266580, China； 3. PetroChina Dalian Petrochemical Company, Dalian Liaoning 116031, China
  • Received:2019-08-14 Revised:2019-09-02 Online:2020-02-28 Published:2020-03-05

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摘要： 由于服役环境的影响，管线钢表面不可避免的会出现腐蚀缺陷，腐蚀处会产生应力集中，促进裂纹形核。基于有限元方法建立了用于预测腐蚀缺陷形貌发展的应力和电化学多物理场耦合模型。在模型中采用了变形几何和动态网格技术，用以研究X70管线钢在海泥模拟溶液中的应力腐蚀行为和腐蚀形貌随时间发展情况。结果表明，机械⁃电化学效应对应力腐蚀裂纹的形核具有重要作用；较小的腐蚀缺陷宽度使应力集中程度加大，电极电位负移，腐蚀速率增大；随着操作压力增大，腐蚀缺陷底部的管壁出现大面积的高应力集中区域，因腐蚀导致的金属损失面积增大。

关键词: 管线钢, 　腐蚀缺陷, 　应力腐蚀, 　有限元模型

Abstract: Due to the effects of service environment, corrosion defects inevitably appear on pipeline surface, which will cause stress concentration and promote crack nucleation. In this study, a coupled stress and electrochemical multi⁃physical field model for predicting the morphological development of corrosion defects was established based on the finite element method. The time dependence of stress corrosion behavior and corrosion morphology of X70 pipeline steel in sea mud simulated solution were studied by using the established model via deformation geometry and dynamic mesh technology. The results showed that the mechanical⁃electrochemical effect played an important role in the nucleation of stress corrosion cracks. The smaller the width of corrosion defects, the greater the stress concentration, the negative shift of the electrode potential and the higher the corrosion rate. With the increase of the operating pressure, there was a large area of high stress concentration area in the bottom of the corrosion defect, and the area of metal loss caused by corrosion increased.

Key words: Pipeline steel, Corrosion defect, Stress corrosion, Finite element model



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