A MODEL FOR HYSTERETIC MAGNETIC-PROPERTIES UNDER THE APPLICATION OF NONCOAXIAL STRESS AND FIELD

Although descriptions of the effect of stress on spontaneous magnetiza tion within a single domain already exist, there remains no adequate m athematical model for the effects of noncoaxial magnetic field and str ess on bulk magnetization in a multidomained specimen. This article ad dresses the problem and provides a phenomenological theory that applie s to the case of bulk isotropic materials. The magnetomechanical hyste resis model of Sablik and Jiles is thus extended to treat magnetic pro perties in the case of noncoaxial stress and magnetic field in an isot ropic, polycrystalline medium. In the modeling, noncollinearity betwee n magnetization and magnetic field is taken into account. The effect o f roll-axis anisotropy is also considered. Both magnetic and magnetost rictive hysteresis are describable by the extended model. Emphasis in this article is on describing properties like coercivity, remanence, h ysteresis loss, maximum flux density, and maximum differential permeab ility as a function of stress for various angular orientations between field and stress axis. The model predictions are compared with experi mental results.