| Evaluation of Surface Cracks Using Magnetic Flux Leakage Testing |
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| 引用本文： | LumingLI SonglingHUANG 等. Evaluation of Surface Cracks Using Magnetic Flux Leakage Testing[J]. 材料科学技术学报, 2002, 18(4): 319-321 |
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| 作者姓名： | LumingLI SonglingHUANG 等 |
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| 作者单位： | NDTCenter,MechanicalEngineeringDepartment,TsinghuaUniversity,Beijing100084,China |
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| 基金项目： | This work was sponsored by the National Natural Science Foundation of China (Grant No.50001006). |
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| 摘 要： | The magnetic field distribution characteristics of surface cracks with various widths are discussed based on finite element (FEM) results.The crack depth was 0.20 mm ,the width range was from 0.02 to 1.00mm .The results showed that crack width and lift-off( the distance between surface and sensor )will influence singals.Discussed in this paper is the influence of various lift-off parameters on the peak to peak values of the normal component in magnetic flux leakage testing .The effects can be applied to evaluate surface breaking cracks of different widths and depths.An idea is presented to smooth narrow, sharp crack tips using alternating current (AC) field magnetization.
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| 关 键 词： | 磁通量 缝宽 磁损失 磁泄漏 表面裂缝 金属材料 性能 |
| 收稿时间： | 2001-05-08 |
Evaluation of Surface Cracks Using Magnetic Flux Leakage Testing |
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| Luming LI,Songling HUANG,Peng ZHENG,Keren SHI. Evaluation of Surface Cracks Using Magnetic Flux Leakage Testing[J]. Journal of Materials Science & Technology, 2002, 18(4): 319-321 |
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| Authors: | Luming LI Songling HUANG Peng ZHENG Keren SHI |
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| Affiliation: | NDT Center, Mechanical Engineering Department, Tsinghua University, Beijing 100084, China |
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| Abstract: | The magnetic field distribution characteristics of surface cracks with various widths are discussed based on finite element (FEM) results. The crack depth was 0.20 mm, the width range was from 0.02 to 1.00 mm. The results showed that crack width and lift-off (the distance between surface and sensor) will influence signals. Discussed in this paper is the influence of various lift-off parameters on the peak to peak values of the normal component in magnetic flux leakage testing. The effects can be applied to evaluate surface breaking cracks of different widths and depths. An idea is presented to smooth narrow, sharp crack tips using alternating current (AC) field magnetization. |
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| Keywords: | Magnetic flux leakage testing (MFL) Slot width Finite element method (FKM) |
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