Dae-gil Kim

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The processing and final part quality of out-of-autoclave (OOA) prepreg composites are strongly influenced by the thermo-chemical and thermo-mechanical properties of the resin. These properties are primarily influenced by the out-time, or room temperature exposure time, of the resin prior to cure, and by the chosen cure cycle. However, both these factors(More)
The cutting, lay-up and bagging of out-of-autoclave (OOA) prepregs for composite part fabrication can take from several days to weeks, depending on the desired part size. This period of ambient temperature " out-time " induces resin polymerization/cross-linking, and affects critical physicochemical phenomena such as minimum viscosity, gelation, and(More)
A fiber-optic cure monitoring system is proposed to measure curing status of composite structure such as a large scale wind turbine blade. The monitoring is based on the measurement of Fresnel reflectivity at the optical fiber/epoxy resin interface. The refractive index of epoxy resin varies throughout curing stages, changing the Fresnel reflectivity. The(More)
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