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Analysis of the topography of magnetic flux leakage in ferromagnetic products
https://doi.org/10.26896/1028-6861-2021-87-2-33-37
Abstract
An urgent problem of non-destructive testing is measuring (or calculating) of the magnetic fields both inside and outside the ferromagnetic products. Determination of the parameters of defects is significantly complicated by the fact that ferromagnetic products can be made from different steel grades. Moreover, when calculating the magnetic fields of defects, it is necessary to take into account the nonlinear character of the dependence of the magnetization M and magnetic permeability μ on the magnetic field strength. At the same time, computer modeling provides an opportunity to study magnetic fields near the defects of different shape, orientation and size. We present the results of studying the topography of the magnetic fields of defects belonging to three classes: surface defects (cracks), inclusions, and extended subsurface defects. The distinguishing features of the defects and the algorithm providing assignment of the defect to a certain class using data of analysis of magnetic flux leakage with a subsequent choice of the appropriate approach to calculating the parameters of the defect are presented. A technique, based on determining the extrema of the normal component of magnetic fields is proposed to estimate the direction of inclination of the surface defects and extended subsurface defects (longitudinal delamination) in a ferromagnetic plate. The obtained results can be used for structuring data on the fields of defects of different classes and developing a software on their base for nondestructive measuring devices.
About the Authors
A. P. Novoslugina
M. N. Mikheev Institute of Metal Physics, Ural Branch of RAS
Russian Federation
18, ul. S. Kovalevskoy, Yekaterinburg, 620108, Russia
Russian Federation
18, ul. S. Kovalevskoy, Yekaterinburg, 620108, Russia
Ya. G. Smorodinsky
M. N. Mikheev Institute of Metal Physics, Ural Branch of RAS;
The First President of Russia B. N. Yeltsin Ural Federal University,
Russian Federation
Russian Federation
18, ul. S. Kovalevskoy, Yekaterinburg, 620108, Russia
19, ul. Mira, Yekaterinburg, 620002, Russia
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Review
For citations:
Novoslugina A.P., Smorodinsky Ya.G. Analysis of the topography of magnetic flux leakage in ferromagnetic products. Industrial laboratory. Diagnostics of materials. 2021;87(2):33-37. (In Russ.) https://doi.org/10.26896/1028-6861-2021-87-2-33-37
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