SYMPOSIA PAPER Published: 01 January 1981
STP27625S

Fatigue Behavior of Silicon-Carbide Reinforced Titanium Composites

Source

The low cycle axial fatigue properties of 25 and 44-fiber volume percent SiC/Ti(6Al-4V) composites were measured at room temperature and at 650°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 silicon-carbide 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 Ti(6Al-4V) matrix. Microstructural studies indicate that the reduced matrix behavior was due, in part, to the presence of flawed and fractured fibers created near the specimen surfaces by preparation techniques. Another possible contributing factor is the large residual tensile stresses that can exist in fiber-reinforced matrices. These effects as well as the effects of fatigue testing at high temperature are discussed.

Author Information

Bhatt, RT
National Aeronautics and Space Administration, Lewis Research Center, Ohio
Grimes, HH
National Aeronautics and Space Administration, Lewis Research Center, Ohio
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 274–290
DOI: 10.1520/STP27625S
ISBN-EB: 978-0-8031-4793-5
ISBN-13: 978-0-8031-0719-9