Affiliations: [a] Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza, Gdansk, Poland | [b] Mechanical Department, Gdansk University of Technology, Narutowicza, Gdansk, Poland
Correspondence:
[*]
Corresponding author: Leszek Piotrowski, Faculty of Applied Physics and Mathematics, Gdansk University of Technology, ul. G. Narutowicza 11/12; 80-233 Gdansk, Poland. Tel.: +48 58 348 6617; Fax: +48 58 347 2821; E-mail:lesio@mif.pg.gda.pl
Abstract: In the paper we describe a novel apparatus for the measurement of the
Barkhausen noise (BN) angular dependence, which in turn may be indicative of
the stress induced anisotropy of magnetic properties. Such dependence can be
further used for the stress distribution evaluation. The change of
magnetization direction in the material is obtained by varying the magnetic
flux density in two perpendicular yokes of the apparatus. We present here,
as an example, the application of the apparatus for the determination of the
stress distribution in the welded plates. It is to be stressed that, thanks
to the very short time of measurements achieved with the presented
apparatus, it is very straightforward to obtain the spatial distribution of
the stress over relatively big area of the plates in question. The whole
measurement process as well as obtained data post processing is computer
controlled and a stress distribution (based on 5 × 5 measurement matrix) for a
single plate may be determined in less than an hour.
Keywords: Barkhausen effect, material characterization, stress anisotropy, welding
