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为了实现对管道磁记忆检测信号与缺陷应力关系的定量研究,建立了含腐蚀缺陷管道的二维有限元仿真模型,给出了应力-磁导率耦合数学模型以及管体应力和地磁场求解控制方程。首先利用ANSYS的应力分布功能,计算求得管体在4.5MPa内压下的应力强度分布,然后根据应力-磁导率数学模型计算求得管体外侧的地磁场分布,表明管体应力与磁导率之间具有一定的耦合关系,证实了有限元模拟技术可以准确捕捉到管体缺陷处的磁应力信号,进而判定管道的缺陷特征。
In order to quantitatively study the relationship between signal and defect stress of pipeline magnetic memory, a two-dimensional finite element simulation model of pipeline with corrosion defects was set up, and the mathematical model of stress-permeability coupling and solution of tube stress and geomagnetic field equation. First of all, the stress distribution function of ANSYS was used to calculate the stress intensity distribution under the internal pressure of 4.5MPa. Then, the distribution of geomagnetic field outside the pipe body was calculated according to the stress-permeability mathematical model, It has been proved that finite element simulation can accurately capture the magnetic stress signal at the tube defects and then determine the defect characteristics of the tubes.