Characterization of Fatigue Behavior of 2-D Woven Fabric Reinforced CeramicMatrix Composite at Elevated Temperature

摘要

This study investigated the fatigue behavior and associated damage mechanisms innotched and unnotched enhanced Sic/SiC ceramic matrix composite specimens at 1100 deg C. Stiffness degradation, strain variation, and hysteresis were evaluated to characterize material behavior. Microscopic examination was performed to characterize damage mechanisms. During high cycle/low stress fatigue tests, far less fiber/matrix interface debond was evident than in low cycle/high stress fatigue tests. Notched specimens exhibited minimal stress concentration during monotonic tensile testing and minimal notch sensitivity during fatigue testing. Damage mechanisms were also similar to unnotched.