Crack growth in ceramic matrix composites with creeping fibers in an elastic matrix
- Univ. of California, Santa Barbara, CA (United States)
The effect of creeping fibers on the growth of bridged matrix cracks has been investigated using a time dependent bridging law. This time dependent bridging law was developed from a micro-mechanical analysis of a cell model with the following assumptions; the fibers creep, the matrix is elastic, and slip occurs at the fiber-matrix interface with a constant shear sliding stress. The problem of time dependent crack growth is presented in the context of both unidirectional and laminated composites. An approximation for a steady-state crack velocity has been developed and compared with more detailed calculations for crack growth under the assumption of a constant critical stress intensity factor at the matrix crack tip. The implications of time dependent crack growth and fiber rupture on estimating the life of ceramic matrix composites are discussed as well.
- OSTI ID:
- 175371
- Report Number(s):
- CONF-950686--
- Country of Publication:
- United States
- Language:
- English
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