本文基于COMSOL Multiphysics软件构建含腐蚀缺陷的海底悬跨管道三维数值模型，综合考虑温度场、应力场和电化学腐蚀场多物理场耦合效应，自定义固体力学、固体传热和二次电流模块之间的耦合关系，研究了内压、拉伸应变和温度对海底悬跨管道应力腐蚀行为的影响规律。结果表明，在热应力影响下，腐蚀电位越负，管道发生腐蚀的倾向性呈现增大的趋势；内压增大时，腐蚀电位负移，缺陷中心的腐蚀电位相对于两端更加显著，腐蚀底部中心区域腐蚀速度快于边缘区域；拉伸应变增大时，缺陷中心的阳极电流密度明显大于缺陷两端，中心阴极电流密度明显小于两端；温度增加时，电流密度增大，腐蚀进程加快。
This paper constructs a three-dimensional numerical model of a subsea suspended pipeline with corrosion defects based on COMSOL Multiphysics software, comprehensively considering the coupling effects of multiphysics fields such as temperature, stress, and electrochemical corrosion. It customizes the coupling relationships between the solid mechanics, heat transfer in solids, and secondary current distribution modules, investigating the impact of internal pressure, tensile strain, and temperature on the stress corrosion behavior of subsea suspended pipelines. The results indicate that, under the influence of thermal stress, as the corrosion potential becomes more negative, the tendency for pipeline corrosion increases. As internal pressure increases, the corrosion potential becomes more negative, with the corrosion potential at the defect center becoming more pronounced than at the ends, and a faster corrosion rate observed in the central area of the defect bottom compared to the edges. With increasing tensile strain, the anodic current density at the defect center increases significantly compared to the ends, while the cathodic current density at the center is substantially lower than at the ends. As temperature rises, the current density increases, thereby accelerating the corrosion process.
2025,47(21): 143-150 收稿日期：2024-11-11
DOI：10.3404/j.issn.1672-7649.2025.21.023
分类号：U177
基金项目：山东省重点研发计划（重大科技创新工程）资助项目（2023CXGC010409）；自主创新科研计划项目（理工科）—领军人才培育基金资助项目（24CX07001A）
作者简介：娄敏(1981-),女,博士,教授,研究方向为深水新型立管力学分析与优化设计、海洋管道流固耦合及振动抑制、深水柔性管道设计与研发
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