表面类裂纹缺陷与地磁场相对空间位置对漏磁场检测的影响

采用低频电磁场的有限元单元分析方法，分析铁磁性金属零件表面类裂纹缺陷与地磁场的空间相对位置变化对缺陷处漏磁场的影响，并通过试验进行了验证。结果表明：相对空间位置对漏磁场强度值影响较大，但对漏磁场强度曲线的变化特征影响不大。当缺陷与地磁场磁力线相互垂直时，漏磁场强度值最大；当缺陷与地磁场磁力线平行时，漏磁场强度值最小。这表明当采用漏磁场检测方法进行无损探伤时，零件的空间方向可能会影响探伤结果。

Impact of Relative Spatial Location between Crack-like Defect and MF on MLF Detection

Low-frequency electromagnetic Finite Element Method is used to analyze how the relative space location between the defect and the earth magnetic field affects the characteristics of the magnetic leakage fields and this is validated through experimentation. The simulation results indicate that the relative space location doesn＇ t affect the characteristic of magnetic field curve much, but affects the magnetic filed intensity. When the two are perpendicular, the magnetic filed intensity is maximum, when parallel, minimum. It shows that when using Magnetic Leakage Field Testing （ MLFT）, the space location of the part may affect the testing result.