Abstract
The fatigue crack growth behavior of a large number of continuous fiber-reinforced titanium matrix composite systems with significantly different interfacial characteristics were examined in this study using single-ply specimens. Crack deflection, debonding, and bridging were observed in most composites, even for the ones with strongly bonded fibers. Experimental results supported a stress-based criterion for predicting the debonding behavior. Crack kinking and penetration as well as fiber strength degradation and in situ fiber strength issues have been addressed in the context of preserving the bridging characteristics. General trends in the crack growth response with variations in the interface bond strength have been observed, wherein the normalized bridging stress decreases gradually with an increase in the bond strength. This gradual decrease suggests the possibility of obtaining improved transverse properties without substantial degradation to the longitudinal fatigue crack growth properties.
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