Journal of Mechanical Science and Technology

  • 제14권10호
  • /
  • Pages.1072-1080
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  • 2000
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  • 1738-494X(pISSN)
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  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

An Algorithm for the Characterization of Surface Crack by Use of Dipole Model and Magneto-Optical Non-Destructive Inspection System

  • Lee, Jin-Yi (R&D Center, Lacomm Co., Ltd.) ;
  • Lyu, Sung-Ki (School of Transport Vehicle Engineering, Research Center for Aircraft Parts Technology, Gyeongsang National University) ;
  • Nam, Young-Hyun (R&D Center, Korea Heavy Industries & Construction Co., Ltd.)
  • 발행 : 2000.10.01
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초록

Leakage magnetic flux (LMF) is widely used for non-contact detection of cracks. The combination of optics and LMF offers advantages such as real time inspection, elimination of electrical noise, high spatial resolution, etc. This paper describes a new nondestructive evaluation method based on an original magneto-optical inspection system, which uses a magneto-optical sensor, LMF, and an improved magnetization method. The improved magnetization method has the following characteristics: high observation sensitivity, independence of the crack orientation, and precise transcription of the geometry of a complex crack. The use of vertical magnetization enables the visualization of the length and width of a crack. The inspection system provides the images of the crack, and shows a possibility for the computation of its depth.

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참고문헌

  1. Dennis, J. J. and Woods, D. J., 1987, 'New computing Environments: Microcomputers in Large-Scale Computing', Society for Industrial and Applied Mathematics
  2. Fitzpatrick, G. L., Thome, D. K., Skaugset, R. L., Shih, E. Y. C., and L. Shih, W. C., 1993, 'Magneto-Optic/Eddy Current Imaging of Aging Aircraft-A New NDI Technique,' Materials Evaluation, Vol. 51, No. 12, pp. 1402-1407
  3. Ishihara, M., Sakamoto, T., Haruna K., Nakamura, N., Machida, K., and Asaharaara, Y., 1996, 'Advanced Magnetic Flux Leakage Testing System Using Magneto-optical Film,' Journal of the Japanese Society for Nondestructive Inspection, Vol. 45, No. 4, pp. 283-289
  4. Lee, J. and Shoji T., 1998b, 'Novel NDI and Analysis of the Crack by use of New Magnetization Method and MO sensor,' Proceedings of The 75th JSME Spring Annual Meeting, pp. 604-605
  5. Lee, J., and Shoji, T., 1999a, 'Development of a NDI System using the Magneto-Optical Method-Development of the Magneto-Optical Inspection System,' Journal of the Japanese Society for Non-Destructive Inspection, Vol. 48, No. 3, pp. 165-171
  6. Lee, J., and Shoji, T., 1999b, 'Development of a NDI System using the Magneto-Optical Method-Remote Sensing using the Novel Magneto-Optical Inspection System,' Journal of the Japanese Society for Non-Destructive Inspection, Vol. 48, No. 4, pp. 165-171
  7. Lee, J., Lee, H., Shoji, T., and Minkov, D., 1998a, Application of Magneto-Optical Method for Inspection of a Tube, IOS Press, Amsterdam, pp. 49-57
  8. Lee, J., Shoji, T., and Najib, N., 1997, 'Development of the Crack Inspectio System by use of Laser and Leakage Magnetic Flux,' Proceedings of Symposium on Optical NDT Methods for Surface Flaw Detection, Tokyo, pp. 55-62
  9. Minkov, D., Lee, J. and Shoji, T., 2000, 'Improvement of the Dipole Model of a Surface Crack,' Materials Evaluation (in press)
  10. Mukae, S., Katoh, M. and Nishio, K., 1988, 'Investigation of Quantification for Defect and Effect of Factors Affecting Leakage Flux Density in Mangetic Leakage Flux Testing Method', Journal of the Japanese Society for Non-Destructive Inspection, Vol. 37, No. 11, pp. 885-894
  11. Sato, K., 1994, Optics and Magnetics, Asakurasyoten