On the fatigue response of bridging ductile fibers in an MoSi2 intermetallic composite
Dève, H.E., Spearing, S.M. and Maloney, M.J. (1993) 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), 209-214. (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.
|Subjects:||T Technology > TN Mining engineering. Metallurgy|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||30 Jan 2007|
|Last Modified:||02 Mar 2012 12:04|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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