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Conception et prédiction des caractéristiques diélectriques des matériaux composites à deux et trois phases par la modélisation et la validation expérimentale

Abstract : This work deals with the design and prediction of the dielectric characteristics of two- and three-component composite materials by the computer modeling and by the experimental validation. The modeling of the materials is executed in Phi3d electric field calculating package, based on the algorithm which solves Laplace equation using boundary integral equation method (BIEM). The complex effective permittivity of the composite materials is studied in function of frequency in the range 50 Hz – 1 MHz, in the quasi-static approximation, and in function of the filler inclusions concentration and their shapes. The experimental validation is carried out on material samples elaborated in laboratory. The studied composites are two- and three-phase materials, and materials with coated inclusions. The samples made out of epoxy resin matrix contain different kinds of fillers: Glass micro spheres and hollow glass micro spheres filled composites aimed in the best verification of the exactitude of the numerical method through the comparison of the results with those of mixing laws predictions; and Barium titanate filled composites which were used to find the powder particles best simulating models.
Samples with fiberglass were cut out of the composite insulator glass-polymeric rod. In this case the humidity rate that may be absorbed by the samples in the water boiling process is determined by the modeling. Finally, a study executed on the melting hail in the air matrix, shows that the attenuation coefficient obtained by simulations is in a good accordance with the results predicted by the analytical laws.
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  • HAL Id : tel-00144550, version 1

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Sabina Orlowska. Conception et prédiction des caractéristiques diélectriques des matériaux composites à deux et trois phases par la modélisation et la validation expérimentale. Mécanique [physics.med-ph]. Ecole Centrale de Lyon, 2003. Français. ⟨tel-00144550⟩

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