In this paper, we theoretically investigated stress-induced magnetic anisotropy and presented a model based on a unidirectional tensile stress experiment. Firstly, the theoretical model was simulated based on the work of Jiles. Secondly, experiments were conducted, and data under unidirectional tensile stress were collected and analyzed. Finally, the model was developed by correlating the experimental data and theoretical model. Our model provides a good description of stress-induced magnetic anisotropy under unidirectional tensile stresses and lays down a foundation for the quantitative testing and evaluation of stress of ferromagnetic materials through the magnetic method. INDEX TERMS Magnetomechanical effect, stress-induced magnetic anisotropy model, stress testing.

In order to study the effect of stress/plastic deformation on electrical conductivity of various magnetic materials, the electrical conductivity of silicon steel, carbon steel and aluminum alloy of different resistance coefficients at the stage of elasticity deformation and plastic deformation were studied by measuring the resistance, fitting-models were established through theorization and measuring data, and corresponding parameters are given. The results show that: x At the stage of elasticity deformation, the electrical conductivity of the material increases rapidly first, and then slowly increases with the increase of stress. y At the stage of plastic deformation under stress unloading conditions, the electronic conductivity decreases approximately linearly with the increase of plastic deformation. z At the stage of plastic deformation under stress loading conditions, the electronic conductivity decreases approximately linearly with the increase of plastic deformation. As the result of stress, electrical conductivity in the superposition state is higher than that in the corresponding plastic deformation state.

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