Selected Aspects of Thermomechanics of Ferrite Bodies Under Electromagnetic Actions

Physical and mathematical problems related to the construction of the proposed model of quantitative description and methods of studying the thermally stressed state of ferrite bodies caused by the action of low external quasi-steady electromagnetic fields (EMF) of high carrier frequency are discussed. The model is based on the general theory of the interaction of EMF and material continuum (which can be simultaneously magnetized and polarized in certain parts of the frequency spectrum of quasi-steady EMFs), in which the effect of electromagnetic radiation is taken into account by heat dissipations (associated with both remagnetization and repolarization, as well as Joule) and ponderomotive forces (at the statistical description of the power factors of the impact of radiation on the considered body), and also known from the literature for such materials’ experimentally determined characteristics—complex magnetic and dielectric permeabilities and corresponding tangents of the loss angles. Solutions of new problems on determination of electromagnetic, temperature, and mechanical fields in a layer made from ferrite material under the influence of EMF caused by a given quasi-steady electric current, uniformly as well as periodically distributed along the spatial coordinate in the current-carrying plane parallel to the base of the layer, are obtained. A number of new regularities of the mechanical behavior of ferrite bodies subjected to external electromagnetic loads, in particular related to resonance phenomena, have been revealed.