Interfacial characterization of 2D woven SiC/SiC and cross-ply 0 degrees/90 degrees CAS/SiC composites

A study has been made on the micromechanical behaviour of the interfaces present in two silicon carbide fibre (Nicalon) reinforced ceramic matrix composites: a cross-ply 0 degrees/90 degrees composite with a calcium-aluminium silicate (GAS) glass matrix and a 2D woven composite with a chemical vapour infiltrated silicon carbide matrix. The interfacial properties were determined from fibre push-down tests performed with a nano-indentation system. Several micromechanical models have been fitted to the experimental data to obtain the interfacial mechanical parameters of sliding resistance, debond energy and residual stress. For both materials, the validity of the assumptions of these models is discussed.