Due to their high thermo-mechanical properties and low densities, ceramic matrix composites (CMC) are candidate materials for hot parts in gas-turbine engines. Various applications have been identified for several types of CMC including C/SiC (nozzles), SiC/SiC (compressor blade) and all oxide composites (combustors). This work presented relates to both the characterization of the mechanical behaviour of woven composites 3D-SiC/Si-BC and the development of a multi-scale elastic behaviour suitable for complex CMC structures approach. A first model at the mesoscale has been developed taking into account the variability of the material (porosity, architecture, manufacturing, etc ...). The HPZ model ("Homogenisation par Zone" in French) based on the discretization of the homogenization field allows to link the mesoscopic scale and the scale of the structure.
