4.3 Article

Investigation of the role of a nonmagnetic spacer in local wall thinning inspection

Publisher

IOS PRESS
DOI: 10.3233/JAE-180002

Keywords

Local wall thinning; magnetic NDT; magnetic adaptive testing; nonmagnetic spacer

Funding

  1. Hungarian Scientific Research Fund [K 111662]
  2. Japan Society for Promotion of Science
  3. Hungarian Academy of Sciences
  4. Czech Academy of Sciences
  5. Czech Science Foundation [14-36566G]
  6. JSPS Core-to-Core Program Advanced Research Networks: International research core on smart layered materials and structures for energy saving

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Detectability of an artificial slot, placed at the bottom of a steel plate was investigated by the method of Magnetic adaptive testing (MAT), when the measurement was performed through another steel plate. Influence of an air gap (or of a nonmagnetic spacer) located either between the magnetizing yoke and the top plate surface or between the two plates was explored. It was found that if the thickness of the nonmagnetic spacer was not larger than 0.15 mm, it had no influence on the detectability of the slot in the given geometry. This result shows an excellent applicability of MAT, and it is encouraging for possible future practical applications. The empirical data were compared with results of an electromagnetic simulation, and the outcome was interpreted and explained.

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