Measurement and Evaluation of the Defect Size in Soft Magnetic Composites Using Magnetic Field Inspections

Adam Jakubas and Paweł Jabłoński
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Adam Jakubas: Faculty of Electrical Engineering, Czestochowa University of Technology, al. Armii Krajowej 17, 42-200 Częstochowa, Poland
Paweł Jabłoński: Faculty of Electrical Engineering, Czestochowa University of Technology, al. Armii Krajowej 17, 42-200 Częstochowa, Poland

Energies, 2021, vol. 14, issue 9, 1-18

Abstract: This article presents a method for detecting defects and assessing their size in soft magnetic composites (SMCs) based on magnetograms obtained from a magnetic field camera and a numerical analysis of the magnetic field around them. For the purpose of the experiment, toroidal samples of a metal–polymer composite were made, in which holes and gaps simulating defects were prepared. The magnetic camera allowed for registering the magnetic flux density image near the surface of the samples. As a result, magnetograms with information about the location and geometry of defects were obtained. A numerical analysis was used to investigate the influence of various factors, such as defect depth, its size and material permeability. Theoretical changes in magnetic field over defects stay in good agreement with measurements, which is a strong indication that surface field magnetograms can be useful in a quality assessment of the considered composites. The effectiveness and usefulness of the method in detecting surface and shallow subsurface defects in SMC materials was confirmed. The influence of a possible tangent component of the exciting field was demonstrated and discussed.

Keywords: non-destructive testing; soft magnetic composites; micro-Hall sensors; FEMM; magnetogram; surface and subsurface defects (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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