Modified Jiles-Atherton-Sablik model for asymmetry in magnetomechanical effect under tensile and compressive stress

A robust magnetomechanical effect model is desirable for the measurement of magnetic properties in the evaluation of stress in ferromagnetic materials. The previous classical Jiles-Atherton-Sablik model has some limitations in describing the asymmetry in magnetic behavior under tensile and compressive stress. In this paper, the Jiles-Atherton-Sablik model has been modified by the incorporation of a stress demagnetization term, a variable pinning coefficient, a stress-dependent domain coupling coefficient, and stress-dependent saturation magnetostriction. It is found that the modified model provides a much better description of asymmetrical magnetic properties under tension and compression. Moreover, the accuracy of the calculations was improved considerably, particularly in the compressive stress situation.