Essais d’impact et propriétés thermiques résiduelles sur composites silice/phénolique
TypeCommunications avec actes
Silica/phenolic composites are used in atmospheric re-entry heat shield parts in spatial and strategic domains. For this application, the material is submitted to thermo-mechanical stresses that lead to delaminations. To reduce the effect of these delaminations, it was proposed to cut silica fabrics and to reassemble them like a patchwork. « Classical » (2D 0°/90° fabric stacks) and « patchwork » materials were impacted on an instrumented falling-weight tower (Instron). These tests were carried out at different energies to create different levels of damage. The damaged samples were analysed by X-Ray micro computed tomography to reveal in particular the delaminations morphologies. In parallel, initial and residual transverse thermal diffusivity measurements were realised on these samples for different damage states. These measurements permitted setting up correlations between loss of thermal diffusivity and material damage. Comparisons between results on « classical » and « patchwork » samples have highlighted differences in damaging modes and a limited interest of the patchwork solution.
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Transferts thermiques 3D dans des composites silice – phénolique: méthodes thermographiques et tomographiques AHMADI-SENICHAULT, Azita; VIGNOLES, Gérard; AYVAZYAN, Viguen; CATY, Olivier; BRESSON, Grégory; GREGORI, Maria Luisa; FONSECA COSTA, Sônia (Société Française de Thermique / Congrès Français de Thermique - Thermique en conditions extrêmes, 29 mai - 1er juin 2012, Bordeaux, 2012)Nous présentons ici le développement d'une approche double pour la caractérisation thermique des matériaux composites.
Thermographic and tomographic methods for three-dimensional characterization of thermal diffusion in silica/phenolic composites AHMADI-SENICHAULT, Azita; VIGNOLES, Gérard; BRESSON, Grégory; CATY, Olivier; AYVAZYAN, Viguen; GREGORI, Maria Luisa; COSTA, S.F. (2014)Aeronautical and space vehicles include many parts made of composite materials. The thermal design of these materials is critical versus their application. Indeed, the presence of very high thermal gradients during use may ...
Thermographic and tomographic methods for tridimensional characterization of thermal transfer in silica/phenolic composites BESSON, Gerard; AHMADI-SENICHAULT, Azita; CATY, Olivier; AYVAZYAN, Vahan; GREGORI, Maria Luisa; COSTA, S.F.; VIGNOLES, Gérard (Composites Part B: Engineering, 2016)Silica/phenolic composite materials are often used in thermal protection systems (TPS) for atmospheric re-entry. The present work aims to compare two different approaches to assess heat transfer properties of these materials: ...
VIGNOLES, Gérard; BRESSON, Grégory; LORRETTE, Christophe; AHMADI-SENICHAULT, Azita (Journal of Physics Conference Series, 2012)We propose a lightweight method for the determination of heat diffusivity of silica fiber bundles based on the use of a laser and an IR camera. The fiber bundle is maintained in traction in a holder; exposition is made as ...
Assessment of geometrical and transport properties of a fibrous C/C composite preform as digitized by X-ray CMT. Part II: heat and gas transport properties VIGNOLES, Gérard; COINDREAU, Olivia; AHMADI-SENICHAULT, Azita; BERNARD, Dominique (Material Research Society, 2007)Raw and partially infiltrated carbon–carbon composite preforms have been scanned by high-resolution synchrotron radiation x-ray computerized microtomography. Three-dimensional high-quality images of the pore space have ...