PSI - Issue 65

Yu.V. Khudorozhkova et al. / Procedia Structural Integrity 65 (2024) 121–126 Yu.V. Khudorozhkova, A.M. Povolotskaya / Structural Integrity Procedia 00 (2024) 000–000

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Figure 3 shows the major and minor (in weak fields) magnetic hysteresis loops measured in sector 6 at different loads. It is obvious from Fig. 3 that, at the initial stage of deformation, the loops are steeper and that they become flatter with a further increase in load. This happens when the load reaches 20 kN in the case of major cycles of magnetization reversal and 25 kN in the case of minor cycles. The change in the shape of the magnetic hysteresis loops under tensile loading is associated with the features of the manifestation of the magnetoelastic effect in steels. а b

Fig. 3. Major (а) and minor (b) magnetic hysteresis loops measured in zone 6 at different loads.

Figures 4 and 5 show the tensile load dependences of the magnetic characteristics (coercive force, residual induction, maximum magnetic permeability) measured at both major and minor magnetization reversal cycles with the pickup coil located in different gauge length sectors (sectors 4–9).

0.05 (a), residual induction b r

0.05 (b), and

Fig. 4. Coercive force H c (a), residual induction B r (b), and maximum magnetic permeability µ max (с), measured in different specimen sectors in major cycling hysteresis, as functions of applied load.

Fig. 5. Coercive force h c

maximum magnetic permeability µ max 0.05 (с), measured in different specimen sectors in minor cycling hysteresis (in weak fields), as functions of applied load.