Design, Fabrication, Installation and Flight Service Evaluation of A Composite Cargo Ramp Skin On A Model CH-53 Helicopter.
UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV
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This report presents the work performed for the installation of a composite skin panel on the cargo ramp of a Sikorsky CH-53D marine helicopter. The composite material is of KevlarEpoxy KE which replaces aluminum outer skins on the aft two bays of the ramp. The cargo ramp aft region was selected as being a helicopter airframe surface subjected to possible significant field damage and would permit an evaluation of the long term durability of the composite skin panel. A structural analysis was performed and the skin shears determined. Single lap joints of KE riveted to aluminum were statiscally tested. The joint tests were used to determine bearing allowables and the required KE skin gage. KE skin panels riveted to aluminum edge members were tested in a shear fixture to confirm the allowable shear and bearing strengths.
- Laminates and Composite Materials
- Structural Engineering and Building Technology