Effect of elastic-plastic deformation by biaxial tension on the magnetic characteristics of the nickel

Abstract

The studies were carried out in a test facility based on the original biaxial testing machine created at the IES UB RAS, designed to determine the physical properties of materials during elastic-plastic deformation independently along two axes. Finite element modeling of the stress-strain state of a cruciform nickel specimen has shown that, under symmetric biaxial tension, equivalent von Mises stresses are uniformly distributed in the central part. The results of microstructural studies indicate that dynamic recrystallization takes place in the material during biaxial deformation at room temperature. The results of studying the behavior of the hysteretic magnetic characteristics, magnetostriction, Barkhausen magnetic noise parameters, and electromagnetic parameters of nickel under biaxial symmetrical tension have been presented. A unique relationship between the coercive force and equivalent stresses in the region of plastic deformation has been revealed. It has been shown that such magnetic parameters as maximum magnetic permeability and the maximum in the field dependence of differential magnetic permeability, as well as the amplitude and frequency of the eddy current signal determined at a frequency of 10 kHz, vary monotonically with increasing equivalent stresses under both elastic and plastic deformations.