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Flight service evaluation of composite helicopter componentsThis first interim report presents the technical background for including environmental effects in the design of helicopter composite structures, and test results after approximately two year field exposure of components and panels. Composite structural components were removed from Sikorsky S-76 helicopters commercially operated in the Gulf Coast region of Louisiana. Fatigue tests were conducted for a graphite/epoxy tail rotor spar and static test for a graphite/epoxy and Kevlar/epoxy stabilizer. Graphite/epoxy and Kevlar/epoxy panels are being exposed to the outdoor environment in Stratford, Connecticut and West Palm Beach, Florida. For this reporting period the two year panels were returned, moisture measurements taken, and strength tests conducted. Results are compared with initial type certificate strengths for components and with initial laboratory coupon tests for the exposed panels. Comparisons are also presented with predicted and measured moisture contents.
Document ID
19840059963
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rich, M. J.
(Sikorsky Aircraft Stratford, CT, United States)
Lowry, D. W.
(Sikorsky Aircraft Stratford, CT, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1983
Subject Category
Aircraft Design, Testing And Performance
Accession Number
84A42750
Funding Number(s)
CONTRACT_GRANT: NAS1-16542
Distribution Limits
Public
Copyright
Other

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