Dève, H.E., Spearing, S.M. and Maloney, M.J.
On the fatigue response of bridging ductile fibers in an MoSi2 intermetallic composite.
Materials Science and Engineering: A. Structural Materials: Properties, Microstructure and Processing, 160, (2), . (doi:10.1016/0921-5093(93)90449-O).
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The fatigue response of bridging molybdenum fibers in an MoSi2 matrix has been investigated. The composite consists of a MoSi2-40% SiC matrix reinforced with alumina coated Mo fibers. Previous work demonstrated that the ductility and interfacial debonding of coated Mo fibers promoted high monotonic fracture resistance based on a bridging mechanism. The current study shows that debonding ductile fibers have also the potential to give adequate fatigue crack growth resistance. A tensile test was devised to measure the opening of a bridged crack as a function of number of cycles. The results suggest that if the applied stress is below a threshold stress governed by the flow stress of the ductile fibers, then the crack opening remains constant after a large number of cycles. This information can be used, in principle, to predict the crack growth rate in composites.
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