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Fatigue Behavior of SIC Reinforced Titanium Composites
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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The low cycle axial fatigue properties of 25 and 44 fiber volume percent SiCTi6Al-4V composites were measured at room temperature and at 650 degrees C. At room temperature, the S-N curves for the composites showed no anticipated improvement over bulk matrix behavior. Although axial and transverse tensile strength results suggest a degradation in SiC fiber strength during composite fabrication, it appears that the poor fatigue life of the composites was caused by a reduced fatigue resistance of the reinforced Ti6Al-4V matrix.
APPROVED FOR PUBLIC RELEASE