A. V. Nikitin, A. V. Mikhaylov, Yu. L. Gobov, S. E. Popov

DETERMINATION OF THE SURFACE OF DEFECT LOCATION AND RESTORATION OF ITS GEOMETRIC PARAMETERS BY THE MFL METHOD WITH ONE-SIDED ACCESS TO THE FERROMAGNETIC PLATE

The paper presents a theoretical and experimental confirmation of the technique allowing the surface of defect location and its geometric parameters to be determined from measuring the values of the magnetic field components above one of the surfaces of a magnetically soft ferromagnetic plate. The technique allows one to take into account the nonlinearity of the response of a ferromagnet to an external magnetostatic field.

Acknowledgments: The work was carried out under the state assignment on the topic of Diagnostics, No. AAAA-A18-118020690196-3.

References:

1. Available at: https://pipelineoperators.org/
2. Available at: https://ntcngd.com/uslugi/article_post/vnutritrubnaya-diagnostika-spomoshchyu-magnitnykh-defektoskopov-vysokogo-razresheniya
3. Bolshakova V.V., Kukin N.A., Dymkin G.Ya. On possibility of NDT magnetic methods for evaluation of strain-stress state of pipelines. Izvestiya peterburgskogo universiteta putey soobshcheniya, 2014, No. 4 (41), pp. 92–98. (In Russian).
4. Slesarev D.A., Abakumov A.A.      Data processing and representation in the MFL method for nondestructive testing. Russian Journal of Nondestructive Testing, 2013, vol. 49 (9), pp. 493–498. DOI: 10.1134/S106183091309009X.
5. Kanaykin V.A. Vnutritrubnaya magnitnaya defektoskopiya magistralnykh truboprovodov [In-line magnetic flaw detection of main pipelines, ed. by A.F. Matvienko]. Ekaterinburg, UrO RAN Publ., 2009, 307 p.
6. Dyakin V.V., Kudryashova O.V., Raevskii V.Y. Stray field of plate with a surface defect in a homogeneous external field. Russian Journal of Nondestructive Testing, 2018, vol. 54, No. 12, pp. 840–848. DOI: 10.1134/S1061830918120033.
7. Gobov Yu.L., Nikitin A.V., Popov S.E. Solving the Inverse Geometric Problem of Magnetostatics for Corrosion Defects. Russian Journal of nondestructive testing, 2018, vol. 54, pp. 726–732. DOI: 10.1134/S1061830918100042.
8. Gobov Yu.L., Nikitin A.V., Popov S.E. Solving the Inverse Geometric Problem of Magnetostatics for Corrosion Defects with Allowance for Nonlinear Properties of Ferromagnet. Russian Journal of nondestructive testing, 2018, vol. 54, pp. 849—854. DOI: 10.1134/S1061830918120045.
9. Nikitin A.V., Mikhaylov A.V., Petrov A.S., Popov S.E., Gobov Yu.L. A technique for practical reconstruction of the shape parameters of two-dimensional surface defects taking into account the nonlinear properties of a ferromagnet. Defektoskopiya, 2021, vol. 12, pp. 46–55. DOI: 10.31857/S0130308221120058.
10. Gobov Yu.L., Popov S.E. Reconstructing the topography of surface defects of ferromagnets in a normal magnetization field. Russian journal of nondestructive testing, 2021, vol. 57, pp. 303–309. DOI: 10.1134/S1061830921040057.
11. Jackson J.D. Klassicheskaya elektrodinamika [Jackson John David. Classical electrodynamics, New York–London : John Wiley&Sons, Inc., 1962], Rus. transl., Moscow, Mir Publ., 1965, 702 p.

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