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Study to investigate design, fabrication and test of low cost concepts for large hybrid composite helicopter fuselage, phase 1The development of a frame/stringer/skin fabrication technique for composite airframe construction was studied as a low cost approach to the manufacture of large helicopter airframe components. A center cabin aluminum airframe section of the Sikorsky CH-53D helicopter was selected for evaluation as a composite structure. The design, as developed, is composed of a woven KEVLAR-49/epoxy skin and graphite/epoxy frames and stringers. To support the selection of this specific design concept a materials study was conducted to develop and select a cure compatible graphite and KEVLAR-49/epoxy resin system, and a foam system capable of maintaining shape and integrity under the processing conditions established. The materials selected were, Narmco 5209/Thornel T-300 graphite, Narmco 5209/KEVLAR-49 woven fabric, and Stathane 8747 polyurethane foam. Eight specimens were fabricated, representative of the frame, stringer, and splice joint attachments. Evaluation of the results of analysis and test indicate that design predictions are good to excellent except for some conservatism of the complex frame splice.
Document ID
19750024958
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Adams, K. M.
(United Aircraft Corp. Stratford, CT, United States)
Lucas, J. J.
(United Aircraft Corp. Stratford, CT, United States)
Date Acquired
September 3, 2013
Publication Date
June 1, 1975
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
SER-50944
NASA-CR-132731
Accession Number
75N33031
Funding Number(s)
CONTRACT_GRANT: NAS1-13479
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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