Development and characterization of brittle matrix model composites
- Northwestern Univ., Evanston, IL (United States)
The effect of constituent properties and geometric parameters on the overall behavior of brittle matrix composites was examined by developing and testing model composites. The model composite materials studied included a silicon carbide fiber/barium borosilicate glass system, a polyvinyl-alcohol fiber/epoxy system, and two optic fiber/epoxy systems. Single fiber pullout tests were used to characterize the interfacial bonding and sliding characteristics of each system. The use of a transparent matrix allowed clear observation of the failure mechanisms, i.e., matrix cracking and fiber debonding, under longitudinal tensile loading. The polyvinyl-alcohol fibers bonded weakly to epoxy although resistance to sliding was high due to fiber roughness and the non-circular cross section of the fibers. The matrix crack densities were high for these composites, which varied in volume fraction from 30 to 48 percent, and also for the optic fiber coated with polyimide, which has a high bond strength with the brittle epoxy.
- OSTI ID:
- 563626
- Report Number(s):
- CONF-9606176--
- Country of Publication:
- United States
- Language:
- English
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