Caracterisation thermocinetique de materiaux composites fibreux soumis a un flux de rayonnement impulsionnel

The purpose of this paper is to test the validity of pulse methods to characterise the thermal properties of a fibrous non random composit material. A tridimensional numerical model shows that the influence of the contact fiber-matrix is slight except when the sample is gaz free and under vacuum; however the longitudinal diffusivity of the fiber is the most important parameter. A “flash” pulse method was used to test the validity of the model. For thick samples, the composit material is similar to an homogeneous material, the thermal properties of which depend on those of the cons tituants and on the geometrical parameters of the composit material.