HIGH TEMPERATURE MECHANICAL CHARACTERIZATION OF MICRO-AND MESO-INTERFACES IN A 3D CARBON-CARBON COMPOSITE
Résumé
3D Carbon-Carbon (3D C/C) composites are key elements in aerospace applications thanks to their beneficial property-to-mass ratio at high temperature. Yet, they display complex mechanical behavior, especially at high temperature, because of the local anisotropy of their constituents and the intricate behavior at the interfaces in-between. The objective of this study is to characterize the interfacial properties of a 3D C/C. This has been carried out at two scales: i) the meso-interfaces, between the yarns composing the material; ii) the micro-interfaces between the fibers and the carbon matrix into the yarns. Monotonic and cycled push-out tests brought characteristic values of these interfaces, such as strength, dissipated energy and friction. The damage mechanisms and the effect of the temperature up to 1473K are also reported. These experimental values will eventually feed a numerical multiscale modeling approach aiming at reproducing the mechanical behavior of such C/C materials.
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