Cyclic-fatigue behavior of SiC/SiC composites at room and high temperatures
- Japan Fine Ceramics Center, Nagoya (Japan)
- Univ. of Tokyo (Japan). Inst. of Industrial Science
- Petroleum Energy Center, Tokyo (Japan)
Tension-tension cyclic-fatigue tests of a two-dimensional-woven-SiC-fiber-SiC-matrix composite (SiC/SiC) prepared by chemical vapor infiltration (CVI) were conducted in air at room temperature and in argon at 1,000 C. The cyclic-fatigue limit (10{sup 7} cycles) at room temperature was {approximately}160 MPa, which was {approximately}80% of the monotonic tensile strength of the composite. However, the fatigue limit at 1,000 C was only 75 MPa, which was 30% of the tensile strength of the composite. No difference was observed in cyclic-fatigue life at room temperature and at 1,000 C at stresses >180 MPa; however, cyclic-fatigue life decreased at 1,000 C at stresses <180 MPa. The fracture mode changed from fracture in 0{degree} and 90{degree} bundles at high stresses to fracture mainly in 0{degree} bundles at low stresses. Fiber-pullout length at 1,000 C was longer than that at room temperature, and, in cyclic fatigue, it was longer than that in monotonic tension. The decrease in the fatigue limit at 1,000 C was concluded to be possibly attributed to creep of fibers and the reduction of the sliding resistance of the interface between the matrix and the fibers.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 422709
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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