Journal of Mechanical Science and Technology

  • 제16권5호
  • /
  • Pages.591-598
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  • 2002
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  • 1738-494X(pISSN)
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  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

Application of a NDI Method Using Magneto-Optical Film for Micro-Cracks

  • Jaekyoo Lim (Department of Mechanical Design, Research Center of Industrial Technology, Chonbuk National University) ;
  • Lee, Hyoungno (G. S., Department of Mechanical Design, Chonbuk National University) ;
  • Lee, Jinyi (R&D Center, Lacomm Co., Ltd.) ;
  • Tetsuo Shoji (Fracture Research Institute, Faculty of Eng., Tohoku University)
  • 발행 : 2002.05.01
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초록

Leakage magnetic flux is occurred in the cracked area of magnetized specimens, and also it changes the magnetic domain area of the magneto-optical film positioned on the specimen. It causes the change of the optical permeability of the magnetic domain on the crack area. So crack images can be obtained easily using this principle. On the other hand, utilizing a laser in this method makes possible to perform a remote sensing by detecting the light intensity contrast between cracked area and normal area. This paper shows the application of non-destructive inspection system taking advantage of magneto-optical method for micro-cracks and presents examples applied to the several types of specimens having fatigue cracks and fabricated cracks using this method. Also the authors prove the possibility of this method as a remote sensing system under the oscillation load considering application to real fields.

키워드

참고문헌

  1. Fitzpatrick, Gerald L. Thome, David K. Skaugset, Richard L. Shih, Eric Y. Shih, William C., 1993, 'Novel Eddy Current Field Modulation of Magneto-Optic Garnet Films for Real-Time Imaging of Fatigue Cracks and Hidden Corrosion,' Proceedings of SPIE- The International Society for Optical Engineering, Publication by Society of Photo-Optical Instrumentation Engineers, Bellingham, WA, USA. Vol. 2001, pp.210-222 https://doi.org/10.1117/12.163845
  2. Lee, J. and Lyu, S., 2000b, 'An Algorithm for the Characterization of Surface Crack By Use of Dipole Model and Magneto-Optical Non-Destructive Inspection System,' KSME International Journal
  3. Lee, J., Shoji, T., Mincov, D. and Ishihara, M., 1998a, 'Novel NDI By Use of Magnet-Optical Film,' Transactions of JSME, 64(619), pp. 825 - 830
  4. Lee, J., Minkov, K. and Shoji, T., 1998b, 'Development of QNDE by Means of Magneto-Optical Inspection System,' Applied Electro-magnetics(II), JSAEM, pp. 181-186
  5. Lee, J. and Shoji, T., 1998c, 'Nondestructive Remote Sensing and Evaluation by Novel Magneto-Optical Inspection System,' The American Society for Nondestructive Testing, 1998-Fall Conference, pp. 183-185
  6. Lee, J. H. and Je, Y. S., 1999, 'Finite Element Analysis of Eddy-Current Nondestructive Evaluation for Steam Generator Tubes,' Transaction of KSME(A), 23-3, pp. 512-519
  7. Lee, J. and Shoji, T., 1999a, 'Development of an NDI System using the Magneto-Optical Method (Preliminary report-Development of the Magneto-optical Inspection System),' Journal of the Japanese Society for Non-Destructive Inspection, 48(3), pp.165-171
  8. Lee, J. and Shoji, T., 1999b, 'Development of an NDI System using the Magneto-Optical Method (2nd report- Remote Sensing using the Novel Magneto-Optical Inspection System),' Journal of the Japanese Society for NonDestructive Inspection, 48(4), pp.231-236
  9. Lee, J., Shoji, T., Mincov, D. and Kato, H., 2000a, 'Nondestructive Evaluation by a Remote Magneto-Optical Inspection System,' The 4th Symposium on Experimental/Numerical Mechanics, pp. 719-722
  10. Minkov, D., Shoji, T. and Lee, J., 1999, 'Experimental Study of Sizing of Surface Cracks by Using Leakage Magnetic Field and Hall Element Probe,' Proceedings of the 2nd International Conference on Emerging Technologies in NDT, Athens/Greece, pp.223-227
  11. Minkov, D., Lee, J. and Shoji, T., 2000a, 'Improvement of the Dipole Model of a Surface Crack,' Materials Evaluation, 58 (5), pp.661-666
  12. Minkov, D., Lee, J. and Shoji, T., 2000b, 'Study of Crack Inversions Utilizing Dipole Model of a Crack and Hall Element Measurements,' Journal of Magnetism and Magnetic Materials, 217(1-3), pp.207-215 https://doi.org/10.1016/S0304-8853(00)00333-4