Isothermal fatigue behavior of a (90) sub 8 SiC/Ti-15-3 composite at 426 C

Technical Report · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5775899

Gayda, J; Gabb, T P

The transverse fatigue behavior of a unidirectional, SiC/Ti-15-3 composite (35 v/o SiC, (90){sub 8}) was evaluated at 426{degree}C. The fatigue behavior of the composite along the fiber direction (0){sub 8} and of unreinforced Ti-15-3 alloy were also studied for comparison purposes. The (90){sub 8} composite fatigue life was much shorter then (0){sub 8} life. Further, (90){sub 8} fatigue life was also found to be far lower than that of the unreinforced Ti-15-3 alloys. A simple one-dimensional model for (90){sub 8} fatigue behavior indicated that the short life of the composite in this orientation resulted, in large part, from weak fiber-matrix bond strength. This conclusion was supported by fractographic evidence showing numerous initiation sites along the fiber-matrix interfaces.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 5775899
• Report Number(s): N-91-20228; NASA-TM--103686; E--5904; NAS--1.15:103686
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
FATIGUE
FIBERS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
SILICON CARBIDES
SILICON COMPOUNDS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS