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- W2007664023 abstract "End-of-Cure Sensing using Ultrasonics for Autoclave Fabrication of CompositesPaul J. Biermann and Joan H. CranmerJohns Hopkins University Applied Physics LaboratoryJohns Hopkins RoadLaurel, MD 20723-6099Carol A. Lebowitz*Edison Welding Institute1250 Arthur E. Adams Dr.Columbus, OH 43210Lawrence M. BrownCarderock Division Naval Surface Warfare CenterBethesda, MD 20084ABSTRACTThe objective of this work was to demonstrate the use of ultrasonics todetermine the end-of-cure for autoclave cured, graphite/epoxy compositelaminates. The fundamental benefit of this work will be understanding when tocomplete the temperature hold and cool down the autoclave and, therefore,consistently produce composite laminates with the desired material properties.An additional benefit is the ability to follow the changing viscosity of the resinduring the initial part ofthe cure.The general approach to this program involved using pulse-echo ultrasonicsto measure the transit time for longitudinal ultrasonic waves to pass through agraphite/epoxy composite laminate during cure. Sixteen, 32 and 64 ply [0/90]sgraphite/Fiberite 934 epoxy panels were fabricated and cured to various end-of-cure conditions. Additionally, panels with various starting conditions were run.Sound speed was calculated using the panel thickness (number of pliesmultiplied by the manufacturer specified thickness of each ply) divided by themeasured transit time." @default.
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- W2007664023 date "1996-11-15" @default.
- W2007664023 modified "2023-09-23" @default.
- W2007664023 title "<title>End-of-cure sensing using ultrasonics for autoclave fabrication of composites</title>" @default.
- W2007664023 doi "https://doi.org/10.1117/12.259184" @default.
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