摘要
漏磁检测是管道无损检测的常用方法,也是最有效方法之一。在检测管道的过程中,对于不同的缺陷会检测到不同的漏磁信号。通过建立管道检测的实体模型,对管道斜向裂纹缺陷所产生的漏磁信号运用ANSYS有限元软件进行模拟仿真,从仿真信号中的磁通密度纵横向矢量图中,直观地显示了漏磁场附近的特点,找到缺陷轮廓及参数。利用有限元可以分析出,缺陷漏磁场的峰值会随着裂纹的倾斜角度、宽度、深度、提离值的大小变化而变化,可以方便地建立大量大小不一形状不同的缺陷样本库,为缺陷的识别提供依据并为定量分析做准备,为进一步对漏磁场的研究打下基础。
MFL is the common way and one of the most effective way of the nondestructive examination. In the process of the detecting of magnetic flux leakage in the pipeline, different flaw will be detected in different magnetic flux leakage signal. In this paper, by means of modeling the mock up, the MFL signal of the crack defect of pipeline is simulated based on the finite element analysis software ANSYS. The signals can show the features of the leakage magnetic field. From the length and width vector graphs, the defect outline and parameters can be described. The peak value of the leakage magnetic field changes along with the changes of the angle of inclination, width, depth, the distance to the defect. So large of different sample can be established for providing the proof to identify the defect and making preparations for the flows＇ quantitative analysis.
出处
《机械》
2008年第8期58-61,共4页
Machinery
关键词
漏磁检测
管道缺陷
仿真
magnetic flux leakage defection
pipeline flaw
simulation
