辽宁石油化工大学学报2025，Vol.45Issue(1)：82-89,8.DOI:10.12422/j.issn.1672-6952.2025.01.011
长输油气管道微裂纹弱磁内检测特性研究
Study on Weak Magnetic Internal Detection Characteristics of Micro-Cracks in Long-Haul Oil and Gas Pipelines
摘要
Abstract
The fracture damage of oil and gas pipelines usually initiates from micro-cracks.The weak magnetic detection method is of practical significance for the detection of microcracks in long distance oil and gas pipelines.However,the microstructure of pipeline microcracks is complex,and the traditional weak magnetic field detection model is difficult to achieve accurate quantitative calculation of pipeline microcracks.Based on the theory of magnetoelectric coupling,a mathematical model of weak magnetic signal of pipeline micro-crack is established.The weak magnetic signal of micro-crack under different excitation conditions is compared and analyzed.The propagation characteristics of micro-crack at different depths and the signal detection characteristics under different lifting values are analyzed and calculated.The results show that the weak magnetic signal generated by the microcrack is much larger than the geomagnetic field,and the difference increases as the increase of the stress value.The weak magnetic signal increases with the increase of stress value.When the critical point of microcrack propagation is reached,the magnetic energy is released due to microcrack propagation,and the weak magnetic signal decreases with the increase of stress value.After microcrack propagation,the magnetic sensitivity of the material decreases,but the linear characteristics are more obvious.The larger the crack depth is,the stronger the weak magnetic signal is,and the damage is more easily detected.With the increase of the lift value,the weak magnetic signal decreases exponentially,and the detection accuracy of the signal in the linear region is the highest.关键词
弱磁/管道/微裂纹/应力/检测Key words
Weak magnetic/Pipeline/Microcrack/Stress/Detection分类
能源科技引用本文复制引用
张贺,郭颖,郎宪明,耿浩,王艳,郑福印..长输油气管道微裂纹弱磁内检测特性研究[J].辽宁石油化工大学学报,2025,45(1):82-89,8.基金项目
国家自然科学基金项目(62101356) （62101356）
辽宁省自然科学基金计划面上项目(2023-MS-289) （2023-MS-289）
辽宁省教育厅高校基本科研项目(JYTMS20231447). （JYTMS20231447）
