论文部分内容阅读
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。
The finite element analysis method of low frequency electromagnetic field was used to analyze the influence of the change of the relative position between the surface crack of ferromagnetic metal parts and the magnetic field on the leakage magnetic field of defects. The results show that the relative spatial location has a great influence on the leakage magnetic field strength, but has little effect on the variation characteristics of the leakage magnetic field strength curve. When the defect is perpendicular to the magnetic field lines of the geomagnetic field, the value of the leakage magnetic field is the largest. When the defect is parallel to the magnetic field lines of the geomagnetic field, the leakage magnetic field intensity is the smallest. This indicates that when using the leakage magnetic field detection method for non-destructive testing, the spatial orientation of the part may affect the test results.