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Analysis and Tests of Reinforced Carbon-Epoxy/Foam-Core Sandwich Panels with CutoutsThe results of a study of a low-cost structurally efficient minimum-gage shear-panel design that can be used in light helicopters are presented. The shear-panel design is based on an integrally stiffened syntactic-foam stabilized-skin with an all-bias-ply tape construction for stabilized-skin concept with an all-bias-ply tape construction for the skins. This sandwich concept is an economical way to increase the panel bending stiffness weight penalty. The panels considered in the study were designed to be buckling resistant up to 100 lbs/in. of shear load and to have an ultimate strength of 300 lbs/in. The panel concept uses unidirectional carbon-epoxy tape on a syntactic adhesive as a stiffener that is co-cured with the skin and is an effective concept for improving panel buckling strength. The panel concept also uses pultruded carbon-epoxy rods embedded in a syntactic adhesive and over-wrapped with a bias-ply carbon-epoxy tape to form a reinforcing beam which is an effective method for redistributing load around rectangular cutout. The buckling strength of the reinforced panels is 83 to 90 percent of the predicted buckling strength based on a linear buckling analysis. The maximum experimental deflection exceeds the maximum deflection predicted by a nonlinear analysis by approximately one panel thickness. The failure strength of the reinforced panels was two and a half to seven times of the buckling strength. This efficient shear-panel design concept exceeds the required ultimate strength requirement of 300 lbs/in by more than 100 percent.
Document ID
19960020487
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Baker, Donald J. (NASA Langley Research Center Hampton,VA United States)
Rogers, Charles (Bell Helicopter Co. Fort Worth, TX United States)
Date Acquired
September 6, 2013
Publication Date
June 4, 1996
Subject Category
Composite Materials
Report/Patent Number
NAS 1.15:111436
NASA-TM-111436
Meeting Information
Meeting: American Helicopter Society 52nd Annual Forum
Location: Washington, DC
Country: United States
Start Date: June 4, 1996
End Date: June 6, 1996
Accession Number
96N24058
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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