Finite Element Method Characterization of 3D
Magnetic Flux Leakage Signal of Crack Discontinuities
at Multiple Liftoff Values
Publication: Publication Date: 1 September 2016Testing Method:
Previous studies commonly did analysis of magnetic
flux leakage (MFL) signals at only one linescan
liftoff and could not give comprehensive
information about the MFL field. This paper uses
the finite element method to analyze MFL information
of surface cracks on pipelines at multiple
liftoff values. The valley-valley spacing value of
axial components and peak-valley spacing value
of radial components are analyzed at multiple
liftoff values. Studies show that signals at multiple
liftoff values indicate more information than
signals at one liftoff. A technique using a double
liftoff compensation algorithm is proposed to
measure width more precisely.
- Dutta, S.M., F.H. Ghorbel, and R.K. Stanley, “Simulation and Analysis of 3-D Magnetic Flux Leakage,” IEEE Transactions on Magnetics, Vol. 45, No. 4, 2009, pp. 1966–1972.
- Hwang, J.H., and W. Lord, “Finite Element Modeling of Magnetic Field/Defect Interactions,” Journal of Testing and Evaluation,Vol. 3, No. 1, 1975, pp. 21–25.
- Katoh, M., K. Nishio, and T. Yamaguchi, “FEM Study on the Influence of Air Gap and Specimen Thickness on the Detectability of Flaw in the Yoke Method,” NDT & E International, Vol. 33, No. 5, 2000, pp. 333–339.
- Kopp, G., and H. Willems, “Sizing Limits of Metal Loss Anomalies using Triaxial MFL Measurements: A Model Study,” NDT & E International, Vol. 55, April 2013, pp. 75–81.
- Li, L.M., P. Zeng, S.L. Huang, and J.J. Zhang, “Effects of Surface Crack width on Y Component of Magnetic Flux Leakage Field,” Journal of Tsinghua University (Sci & Tech), Vol. 39, No. 2, 1999, pp. 43–45 (in Chinese).
- Li, W., G.M. Chen, X.K. Yin, C. Zhang, and T. Liu, “Analysis of the Lift-off Effect of a U-shaped ACFM System,” NDT & E International, Vol. 53, January 2013, pp. 31–35.
- Li, Y., G.Y. Tian, and S. Ward, “Numerical Simulation on Magnetic Flux Leakage Evaluation at High Speed,” NDT & E International, Vol. 39, No. 5, 2006, pp. 367–373.
- Li, Y., J. Wilson, and G.Y. Tian, “Experiment and Simulation Study of 3D Magnetic Field Sensing for Magnetic Flux Leakage Defect Characterisation,” NDT & E International, Vol. 40, No. 2, 2007, pp. 179–184.
- Mandache, C., and L. Clapham, “A Model for Magnetic Flux Leakage Signal Predictions,” Journal of Physics D: Applied Physics, Vol. 36, No. 209, 2003, pp. 2427–2431.
- Mao, W.H., L. Clapham, and D.L. Atherton, “Effects of Alignment of Nearby Corrosion Pits on MFL,” NDT & E International, Vol. 36, No. 2, 2003, 4pp. 111–116.
- Park, G.S., and E.S. Park, “Improvement of the Sensor System in Magnetic Flux Leakage-type Nondestructive testing (NDT),” IEEE Transactions on Magnetics, Vol. 38, No. 2, 2002, pp. 1277–1280.
- Uetake, L., and H. Ito, “Lift-off Effect and its Application to Defect Size Estimation in the Magnetic Leakage Flux Method,” Transactions of National Research Institute for Metals, Tokyo, Japan, Vol. 28, 1986, pp. 177–187 (in Japanese).
- Zhang, Y., Z. Ye, and C. Wang, “A Fast Method for Rectangular Crack Sizes Reconstruction in Magnetic Flux Leakage Testing,” NDT & E International, Vol. 42, No. 5, 2009, pp. 369–375.
- Zhang, Y., Z. Ye, and X. Xu, “An Adaptive Method for Channel Equalization in MFL Inspection,” NDT & E International, Vol. 40, No. 2, 2007, pp. 127–139.
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