Influence of Specimen Velocity on the Leakage Signal in Magnetic Flux Leakage Type Nondestructive Testing

Abstract

We investigate the influence of the specimen velocity on the magnetic flux leakage with the aim of selecting the optimum sensor locations. Parametric numerical simulations where the specimen velocity was in the range [0.1–20] m/s were carried out. As the specimen velocity is increased, the magnetic field varies from being symmetrical to being asymmetric. For the radial magnetic induction \(B_z\), the position at which the maximum difference between the minimum and maximum signal moves from the centre of the bridge towards the direction of the specimen movement. For the axial magnetic induction \(B_y\), the specimen velocity influence is dependent on the sensor location and a signal-velocity independent region was discussed.

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Acknowledgments

The authors would like to acknowledge Advanced Sustainable Manufacturing Technologies (ASTUTE) part-funded by the European Regional Development Fund (ERDF) through the Welsh Government. The authors are grateful to Professor Guiyun Tian, for fruitful discussion with him during the conduct of this work. The authors would also like to thank the referees for their reports.

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Correspondence to Lintao Zhang.

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Zhang, L., Belblidia, F., Cameron, I. et al. Influence of Specimen Velocity on the Leakage Signal in Magnetic Flux Leakage Type Nondestructive Testing. J Nondestruct Eval 34, 6 (2015). https://doi.org/10.1007/s10921-015-0280-1

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Keywords

  • Nondestructive testing
  • Magnetic flux leakage
  • Specimen velocity
  • Peak to peak value