高電力下における傾斜機能型電波吸収体の電磁場-温度場連成効果と非定常熱応力

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  • Coupling Effects and Thermal Stresses of Functionally Graded Type Electromagnetic Wave Absorbers under High Power Injection
  • コウデンリョク カ ニ オケル ケイシャ キノウガタ デンパ キュウシュウタイ ノ デンジバ オンドバ レンセイ コウカ ト ヒテイジョウ ネツ オウリョク

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Functionally graded (FG) type electromagnetic (EM) wave absorbers have been proposed for the improvement in absorption performance and material strength. In this paper, we investigate coupling effects on the performance of the FG type EM wave absorbers for plate under high power injection and transient thermal stresses in the absorption systems. The coupling effects of electromagnetic field and temperature field 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 dependences. Numerical calculations are carried out for the FG type EM wave absorbers composed of epoxy resin matrix and conductive titanium oxide particles. The absorption characteristics and the magnitude of temperatures and thermal stresses are quantitatively evaluated. The effects of irradiation power and material composition distribution on the absorption characteristics and temperature distribution are then discussed. The significance of the coupling effects and the thermal stress analysis is revealed. In addition, a possibility of material design on the FG type absorber suitable for the absorption of EM wave and reduction of thermal stress is suggested.

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