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Characterization of Fatigue Behavior of 2-D Woven Fabric Reinforced Ceramic Matrix Composite at Elevated Temperature.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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This study investigated the fatigue behavior and associated damage mechanisms in notched and unnotched enhanced SicSiC 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 cyclelow stress fatigue tests, far less fibermatrix interface debond was evident than in low cyclehigh 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.
APPROVED FOR PUBLIC RELEASE