Effect of high temperature and fiber distribution on matrix microcracking and toughness of ceramic-matrix composites
This study investigates effect of fiber distribution and temperature on matrix microcracking and toughness of the material, because ceramic-matrix composites are expected to work under high-temperature circumstances. In chapter 2, 3, and 4, two theoretical models of microcracking (two-fiber model and ring model) are proposed and used for the analyses of microcracking. Stress intensity factors or strain energy release rates are calculated for radial, interfacial and matrix cracks for both mechanical and thermal loading. Effect of fiber distribution and mismatch of mechanical constants of fiber and matrix materials are investigated. In chapter 5, experimental results are reported. Effect of temperature on toughness of ceramic-matrix materials (SiC and CAS II) is studied experimentally by using micro-indentation technique. In chapter 6, fiber debonding test are reported. Debonding test data are used for the calculation of bonding strength of fiber-matrix interfaces in conjunction with a theoretical model and finite element procedure.
- Research Organization:
- City Univ. of New York, NY (United States)
- OSTI ID:
- 5632586
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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