| 基于漏磁的表面裂纹识别及评估 |
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| 引用本文： | 刘美全,徐章遂.基于漏磁的表面裂纹识别及评估[J].北京科技大学学报,2003,25(6):575-579. |
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| 作者姓名： | 刘美全 徐章遂 |
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| 作者单位： | 军械工程学院控制工程系无损检测技术研究所,石家庄,050003 |
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| 基金项目： | 国家自然基金(No.50175109) |
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| 摘 要： | 通过建立工件表面两条相互平行槽形裂纹的磁偶极子模型，研究了裂纹漏磁信号之间的相互作用关系，根据漏磁信号的峰值特性对裂纹的几何参数进行了定量评估，通过漏磁信号振幅随两裂纹的深度比和裂纹间距的关系计算了其中较小裂纹的深度，实际检测结果表明，综合利用两个邻接裂纹的漏磁信号进行评估的矢量轨迹法对相邻裂纹的定量评估具有较好的可视效果，该方法简单易行，能够快速准确地对裂纹进行估计。
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| 关 键 词： | 无损检测 漏磁检测 表面裂纹 识别 评估 邻接槽 矢量轨迹 材料 |
| 修稿时间： | 2002年12月25日 |
Distinction and Evaluation of Adjacent Parallel Surface Cracks Based on Magnetic Flux Leakage |
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| LIU Meiquan,XU Zhangsui
Research Institute for NDT.Distinction and Evaluation of Adjacent Parallel Surface Cracks Based on Magnetic Flux Leakage[J].Journal of University of Science and Technology Beijing,2003,25(6):575-579. |
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| Authors: | LIU Meiquan XU Zhangsui
Research Institute for NDT |
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| Institution: | LIU Meiquan,XU Zhangsui
Research Institute for NDT,Department of Control Engineering,Ordnance Engineering College,Shijiazhuang 050003,China |
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| Abstract: | The magnetic dipole model for two adjacent parallel cracks with rectangular shape was established. The relation between the magnetic flux leakage signals caused by two adjacent parallel cracks with rectangular shape on a ferromagnetic material surface and the crack-to-crack distance was clearly clarified. The depth of the smaller crack can be evaluated by considering an effect that the amplitude of leakage flux decreases as the depth ratio of two cracks and the crack-to-crack distance increase. A method based on the analysis of the vector locus consisting of tangential and normal components of the magnetic flux leakage signals was proposed as an alternative to analyzing the waveform. Some experimental results show that the evaluated crack depth is in good agreement with the actual one. |
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| Keywords: | NDT magnetic flux leakage testing crack adjacent slot vector locus |
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