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Lamination residual strains and stresses in hybrid laminatesAn investigation is conducted of the effects of hybridization on the magnitude of lamination residual stresses. Eight-ply graphite/Kevlar 49/epoxy and graphite/S-glass/epoxy laminates were studied. The same matrix resin was selected for all basic materials to ensure compatibility and uniform curing of the various plies. The specimens, with inserted strain gages and thermocouples, were subjected to curing and postcuring cycles in an autoclave. Subsequently, the specimens were subjected to a thermal cycle from room temperature to 444 K and down to room temperature. It was found that hydridizing reduces apparently residual strains and stresses in the graphite plies. However, these strains were not affected much by the type and degree of hybridization.
Document ID
19780028162
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Daniel, I. M.
(IIT Research Inst. Chicago, IL, United States)
Liber, T.
(IIT Research Institute Chicago, Ill., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Subject Category
Structural Mechanics
Meeting Information
Meeting: Conference on Composite materials: Testing and design
Location: Valley Forge, PA
Start Date: May 3, 1976
End Date: May 4, 1976
Accession Number
78A12071
Funding Number(s)
CONTRACT_GRANT: NAS3-16766
Distribution Limits
Public
Copyright
Other

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