Numerical Simulation of Residual Strength for Corroded Pipelines  

作　　者：Yaojin Fan Huaqing Dong Zixuan Zong Tingting Long Qianglin Huang Guoqiang Huang 

机构地区：[1]Central China Branch of National Petroleum and Natural Gas Pipeline Network Group Co.,Ltd.,Wuhan,430020,China

出　　处：《Structural Durability & Health Monitoring》2025年第3期731-769,共39页结构耐久性与健康监测(英文)

摘　　要：This study presents a comprehensive investigation of residual strength in corroded pipelines within the Yichang-Qianjiang section of the Sichuan-East Gas Pipeline,integrating advanced numerical simulation with experimental validation.The research methodology incorporates three distinct parameter grouping approaches:a random group based on statistical analysis of 389 actual corrosion defects detected during 2023 MFL inspection,a deviation group representing historically documented failure scenarios,and a structural group examining systematic parameter variations.Using ABAQUS finite element software,we developed a dynamic implicit analysis model incorporating geometric nonlinearity and validated it through 1:12.7 scaled model testing,achieving prediction deviations consistently within 5%for standard cases.Our analysis revealed distinct failure mechanisms between large and small defects,with large defects exhibiting stress concentration at circumferential edges and small defects concentrating stress centrally.Quantitative analysis identified defect depth as themost significant factor,with every 1mmincrease reducing strength by 0.054MPa,while defect length showed moderate influence at 0.0018MPa reduction per mm.Comparative analysis demonstrated that circumferential defects exhibited 15%higher burst failure pressure compared to axial defects,though this advantage diminished significantly at depths exceeding 40%wall thickness.These findings,validated through experimental testing with deviations within 5%,provide valuable insights for pipeline integrity management,particularly emphasizing the importance of defect depth monitoring and the need for orientation-specific assessment criteria in corrosion evaluation protocols.

关 键 词：Pipeline residual strength corrosion defect finite element analysis burst test failure mechanism 

分 类 号：TG1[金属学及工艺—金属学]