PSI - Issue 40

S.M. Zadvorkin et al. / Procedia Structural Integrity 40 (2022) 455–460 S.M. Zadvorkin, A.M. Povolotskaya / Structural Integrity Procedia 00 (2019) 000 – 000

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the specimen surface and the fluxgate transducer.

Fig. 4. Demagnetizing current I c ( а ), the rms values of voltage U ( b ), and the number of Barkhausen jumps N ( c ) as dependent on the transducer position on the 45 steel specimen with PSLZs: measurements made along the loading axis (curve 1); measurements made across the loading axis (curves 2).

Fig. 5. Results of recording the tangential component of the magnetic leakage field on the surface of the magnetized St3 steel specimen containing a single PSLZ (a) and a photograph of the specimen gauge length (b): the arrow shows the path of scanning the specimen by a fluxgate transducer. A photograph of another St3 steel specimen containing three bands of plastic strain localization, together with the measurements of the tangential component of the magnetic leakage field above the surface of the specimen gauge length made by means of a fluxgate transducer, is shown in Fig. 6. Three extrema in Fig. 6a correspond to the strain localization zones in photo 6b. These data confirm the possibility of identifying multiple plastic strain localization zones in products made of ferromagnetic materials.