| ABSTRACT: |
STRESS AND TEXTURE MEASUREMENT USING BARKHAUSEN NOISE AND ANGULAR
SCANNING OF DRIVING MAGNETIC FIELD
V.Tsukerman, and .Vengrinovich
Institute of Applied Physics, Minsk, Belarus.
The objective of this study was to develop a m and to investigate the behavior of Barkhausen Noise (BN) in
non-isotropic ferromagnetic materials. The angular scan of applied magnetic field was implemented with the
help of the original motionless four-pole-piece sensor. The new magnetization mode, for the first time
integrated in the new commercial BN analyzer “Introscan”,enabled keeping stable the magnetic flux density
pattern and amplitude value in the material under test. Finally the Angular Diagrams (AD) of BN, displayed
in real time, were investigated using materials in different conditions. An item analysis was conducted on
sets of samples made from low- and medium carbon steels. A uni- and bi-axial load was applied to the
specimens to investigate the BN AD behavior in the stressed condition. Textured transformer steel sheets
were used to investigate AD correspondence to a texture value. One of the principle finding of this item is
that roughly three types of AG patterns were observed: circular, ellipsoid-type and star-type. On the basis of
these findings the conclusion can be drawn that the real-time AD patterns are strongly discriminated and
give new information on the non-isotropic properties of material in the point. The quantitative relations
between “star wings”, ellipsoid semi-axis and some other parameters of AD patterns can be used for the
definition of the non-isotropic material properties and internal stress distribution.
|