\r余建星^{1, 2}，金成行^{1, 2}，余 杨^{1, 2}，王华昆^{1, 2}，谭玉娜^{1, 2}

AuthorsHTML:\r余建星^{1, 2}，金成行^{1, 2}，余 杨^{1, 2}，王华昆^{1, 2}，谭玉娜^{1, 2}

AuthorsListE:\rYu Jianxing^{1, 2}，Jin Chenghang^{1, 2}，Yu Yang^{1, 2}，Wang Huakun^{1, 2}，Tan Yuna^{1, 2}

AuthorsHTMLE:\rYu Jianxing^{1, 2}，Jin Chenghang^{1, 2}，Yu Yang^{1, 2}，Wang Huakun^{1, 2}，Tan Yuna^{1, 2}

Unit:\r1. 水利工程仿真与安全国家重点实验室(天津大学)，天津 300072；
2. 高新船舶与深海开发装备协同创新中心，上海 200240

Unit_EngLish:\r1. State Key Laboratory of Hydraulic Engineering Simulation and Safety，Tianjin University，Tianjin 300072，China；
2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration，Shanghai 200240，China

Abstract_Chinese:\r通过建立有限元模型分析了内部随机点蚀对外压作用下2D 圆环屈曲压力的影响．由于管道内部多相流侵蚀-腐蚀的影响，管道极易在6 点钟方向产生内部沟槽腐蚀和点腐蚀，进而导致管道损坏失效．内部腐蚀是造成深海管道损坏失效的重要因素，针对内部随机点蚀对管道屈曲压力影响的问题，将用户自定义的Python 程序嵌入Abaqus 有限元数值模拟软件进行研究．把管道简化为2D 圆环模型，利用Python 程序中均匀分布随机数生成器，建立多个随机点蚀圆片模型；根据内部随机点蚀的特点，采用随机数发生器得到在2D 圆环内表面3 点钟到9 点钟方向随机分布的点蚀坐标；在整体坐标系下完成模型装配后，运用Abaqus 软件中的布尔切割运算功能建立了含内部随机点蚀的2D 圆环有限元模型．使用上述模型研究了外压作用下内部随机点蚀对圆环屈曲压力的影响，模型校准后基于该2D 圆环模型开展了参数敏感性分析，研究结果表明椭圆度、径厚比和腐蚀比是影响2D 圆环屈曲压力折减系数的主要因素．基于多参数非线性回归分析，建立了椭圆度、径厚比和腐蚀比3 个参数对外压作用下含内部随机点蚀2D 圆环屈曲压力折减的经验公式．研究结果可为内部随机点蚀作用下的海底管道的极限强度评估和剩余寿命分析提供参考．

Abstract_English:\rThe finite element model was established to assess the effect of internal random pitting corrosions on the collapse pressure of a 2D ring under external pressure. The impact of erosion-corrosion of multiphase flow inside the pipeline tends to produce internal groove and pitting corrosions at six o’clock position of the pipeline，thereby leading to pipeline damage and failure. Internal corrosion is an important factor that causes damage and failure of deep-sea pipelines. To address the effect of internal random pitting corrosions on pipeline collapse pressure，a Python program was used in combination with the finite element software Abaqus to solve the finite element model. The pipeline was simplified to a 2D ring model. Multiple random pitting wafer models were established using the uniform distribution random number generator in the Python program. According to the characteristics of internal random pitting corrosions，the random number generator was used to obtain the point corrosion coordinates randomly distributed from 3 o’clock to 9 o’clock position on the inner surface of the ring. After completing the model assembly in the integral coordinate system， the 2D ring model with internal random pitting corrosions was established using the Boolean cutting operation function in Abaqus. The effect of internal random pitting corrosions on collapse pressure of the 2D ring was studied based on the odel. After model calibration，sensitivity analysis was conducted based on this model. Results showed that the out-ofroundness， diameter-to-thickness ratio，and corrosion area ratio were the main factors affecting collapse pressure. The mpirical formula with three parameters，including the out-of-roundness，diameter-to-thickness ratio，and corrosion area ratio，of collapse pressure reduction of 2D ring with internal random pitting corrosions under external pressure was established based on multi-parameter nonlinear regression analysis. The results provide reference for the safe operation of submarine pipelines under internal corrosion.

Keyword_Chinese:随机点蚀；深海管道；屈曲压力；敏感性分析

Keywords_English:random pitting corrosion；deep-sea pipeline；collapse pressure；sensitivity analysis


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