HYSTERESIS LOOPS AND THE INELASTIC DEFORMATION OF 0 90 CERAMIC-MATRIXCOMPOSITES/

Hysteresis measurements obtained on 0/90 SiC/CAS and SiC/SiC have been used to analyze the interface responses, Four parameters have been de rived from these measurements. These relate to the compliance change c aused by matrix cracking, the frictional resistance of the interface, the interface debond resistance, and the residual stress. These parame ters have been used to predict the stress/strain curves. Preliminary e stimates of stress partitioning between the plies have been used to es timate constituent properties, such as the friction stress.