Affiliations: Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Gdansk, Poland
Correspondence:
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Corresponding author: Zbigniew Usarek, Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, Gdansk 80233, Poland. E-mail:zusarek@mif.pg.gda.pl
Abstract: Influence of two factors: the variable cross-section and
the localized plastic deformation, which affect the stray magnetic field
profile of a ferromagnetic sample have been studied. Evaluation of an effect
size is based on the analysis of the stray magnetic field component which is
tangential to the longest dimension of a sample. However, in order to
describe the nature of the stray magnetic field, the normal component
(perpendicular to the tangential one and to the largest surface of a sample)
was also measured. It was found that the impact of the localized plastic deformation is
qualitatively similar to the impact of the geometric narrowing. For the
assessment one used a comparison of so called k coefficient that was
determined as the absolute value of the derivative of the tangential
component. Although some authors treat its distribution as information about
residual stess distribution, the results indicate that a characteristic
curve with two maxima stems from a cross-section reduction as well as
plastic deformation presence.
Keywords: Stray magnetic field, magnetic flux leakage, metal magnetic memory, plastic deformation, low carbon steel
