Recurrent formula for effective determination of coercitive force of layered ferromagnetic materials

Keywords

non-destructive testing, layered ferromagnetic material, hysteresis loop, coercive force, residual induction.

Cite as

Rybachuk V. H. and Uchanin V. M. Recurrent formula for effective determination of coercitive force of layered ferromagnetic materials. Physico­chemical Mechanics of Materials. 2022. 58(4), 098-104.

Abstract

The distribution of magnetic fluxes during the reversal magnetization of three- and four-layer ferromagnetic materials with the same layer thickness by attachable probes with a U-shaped core was analyzed. As result, analytical expressions for their effective coercive force (CF) have been obtained. The application of linear approximation for hysteresis loop demagnetization sections of separate layers is substantiated. The presence of stable regula­rities in these expressions is shown. Based on them, a recurrent formula for the effective CF of layered ferromagnetic materials, which consist of an arbitrary number of layers of the same thickness, is proposed. It is established that the effective CF depends not only on the CF of individual layers, but also on their residual magnetic inductions. An experimen­tal verification of the obtained expression is carried out on samples of steels 08kp and Ct3. A magnetic analyzer of the KRM-Ts-MA type is used for CF and residual magnetic induc­tion measurements. The good agreement between the calculated value of the effective CF of the two-layer ferromagnetic material of these steels according to the obtained recurrent formula and the measurement results is confirmed (the error does not exceed 3%).

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