Accession Number : ADA305579

Title :   Design, Fabrication, Installation and Flight Service Evaluation of A Composite Cargo Ramp Skin On A Model CH-53 Helicopter.

Descriptive Note : Contractor rept.,

Corporate Author : UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV

Personal Author(s) : Lowry, D. W. ; Rich, M. J.

PDF Url : ADA305579

Report Date : APR 1983

Pagination or Media Count : 35

Abstract : 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 Kevlar/Epoxy (K/E) 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 K/E riveted to aluminum were statiscally tested. The joint tests were used to determine bearing allowables and the required K/E skin gage. K/E skin panels riveted to aluminum edge members were tested in a shear fixture to confirm the allowable shear and bearing strengths.

Descriptors :   *COMPOSITE STRUCTURES, *HELICOPTERS, *SKIN(STRUCTURAL), TEST AND EVALUATION, FLIGHT TESTING, DAMAGE, COMPOSITE MATERIALS, EDGES, PANELS, STRUCTURAL ANALYSIS, REGIONS, SURFACES, ALUMINUM, STRENGTH(GENERAL), CARGO, AIRFRAMES, EXTERNAL, RAMPS, STRUCTURAL COMPONENTS, JOINT TEST AND EVALUATION, BAYS.

Subject Categories : Helicopters
      Laminates and Composite Materials
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE