刘倩雯,叶广文,马女杰,等.焊接微缺陷磁光成像检测有限元分析[J].精密成形工程,2022,14(3):94-101.
LIU Qian-wen,YE Guang-wen,MA Nv-jie,et al.Finite Element Analysis of Magneto-Optical Imaging for Micro Weld Defects[J].Journal of Netshape Forming Engineering,2022,14(3):94-101. |
| 焊接微缺陷磁光成像检测有限元分析 |
| Finite Element Analysis of Magneto-Optical Imaging for Micro Weld Defects |
| 投稿时间：2021-09-28 |
| DOI：10.3969/j.issn.1674-6457.2022.03.012 |
| 中文关键词: 磁光成像 有限元模型 无损检测 焊接微缺陷 |
| 英文关键词: magneto-optical imaging (MOI) finite element model nondestructive testing micro weld defects |
| 基金项目:广州市科技计划(202002020068) |
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| 中文摘要: |
| 目的 研究铁磁材料焊接微缺陷的磁光成像规律。方法 运用漏磁检测原理和法拉第磁致旋光效应，建立微缺陷三维有限元模型，分析微缺陷磁光成像过程与磁场之间的关联，研究不同提离值、励磁电流、缺陷宽度、缺陷深度下的磁光成像，以及探索这些因素对磁光图像特征的影响。在此基础上，对最小宽度为0.05 mm的微缺陷进行磁光成像检测实验，并与模拟图像进行对比分析。结果 提离值对磁感应强度曲线峰-谷特征的影响最大，随着提离值的减小，磁光图像缺陷宽度更接近实际，且轮廓边界对比度增大。提离值为0.4 mm时模拟的磁光图像与实际采集的最为吻合，在该参数下，电流、缺陷宽度、深度与峰-谷纵坐标差呈正相关，缺陷深度对峰-谷横、纵坐标差的影响最显著，电流的增大会影响漏磁场两端磁感应强度的收敛值。结论 该磁光图像检测有限元分析方法可为实际检测实验提供理论指导。 |
| 英文摘要: |
| The work aims to study the magneto-optical imaging law for micro weld defects of ferromagnetic material. A three-dimensional finite element model of micro defects was established with micro defect magnetic flux leakage detection principle and Faraday magneto-optical rotation effect to analyze the correlation between the magneto-optical imaging process and the magnetic field of micro defects, to study the magneto-optical imaging under different lift-off values of sensor, excitation current, defect width and defect depth, and to explore the effects of these factors on the characteristics of magneto-optical images. On this basis, the magneto-optical imaging experiment was carried out to detect micro-defects with the minimum width of 0.05 mm, and the results were compared with the simulated images. Research results showed that the lift-off value had the greatest effects on the peak-valley characteristics of the magnetic induction intensity curve. With the decrease of the lift-off value, the defect width of the magneto-optical image was closer to reality, and the contrast of contour boundary increased. The simulated magneto-optical image at the lift-off value of 0.4 mm was the most consistent with the actual acquisition. Under this parameter, the current, defect width and depth were positively correlated with the peak-valley ordinate difference. The defect depth had the most significant effect on the peak-valley transverse and ordinate difference. The increase of current affected the convergence value of magnetic induction intensity at both ends of the leakage magnetic field. The finite element analysis method of magneto-optical image detection can provide theoretical guidance for practical detection experiments. |
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