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Ground exposure of composite materials for helicoptersResidual strength results are presented on four composite material systems that were exposed for three years at locations on the North American Continent. The exposure locations are near the areas where Bell Model 206L Helicopters, that are in a NSA/U.S. Army sponsored flight service program, are flying in daily commercial service. The composite systems are: (1) Kevlar-49 fabric/F-185 epoxy; (2) Kevlar-49 fabric/LRF-277 epoxy; (3) Kevlar-49 fabric/CE-306 epoxy; and (4) T-300 Graphite/E-788 epoxy. All material systems exhibited good strength retention in compression and short beam shear. The Kevlar-49/LRF-277 epoxy retained 88 to 93 percent of the baseline strength while the other material systems exceeded 95 percent of baseline strength. Residual tensile strength of all materials did not show a significant reduction. The available moisture absorption data is also presented.
Document ID
19840026506
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Baker, D. J. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
October 1, 1984
Subject Category
Composite Materials
Report/Patent Number
AVSCOM-TM-84-B-2
NASA-TM-86311
NAS 1.15:86311
Meeting Information
Meeting: AHS Natl. Spec. Meeting-Helicopter Testing Technol.
Location: Williamsburg, VA
Country: United States
Start Date: October 29, 1984
End Date: November 1, 1984
Accession Number
84N34577
Funding Number(s)
PROJECT: RTOP 505-42-23-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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