Abstract
Functionally graded (FG) type electromagnetic (EM) wave absorbers have been proposed for the improvement in absorption performance and material strength. In this study, coupling effects on the performance of the FG type EM wave absorbers and thermal stresses in the absorbers are investigated. The coupling effects of electromagnetic field and temperature field related with the heat generation due to high power injection and temperature-dependency of electromagnetic properties are analyzed by weak-coupling method based on the iterative use of the analytical solutions for each field. The thermal stress field is also analyzed for a thin plate with arbitrary nonhomogeneous properties and temperature-dependent thermal and electromagnetic properties. Numerical calculations are carried out for the FG type EM wave absorbers composed of epoxy resin and conductive titanium oxide. The magnitude of electric field, temperature field and thermal stress field is evaluated. The effects of material composition distribution, high power injection and heat condition on the absorption performance and thermal stress are then discussed. The significance of the coupling effects and the thermal stress analysis is revealed.
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