EVALUATION OF A METAL SHEAR WEB SELECTIVITY REINFORCED WITH FILAMENTARY COMPOSITES FOR SPACE SHUTTLE APPLICATION PHASE Ⅲ SUMMARY REPORT – SHEAR WEB COMPONENT TESTING AND ANALYSIS

摘要

Testing and Analysis activities are summarized which were conducted under Phase III of NASA/Langley Research Contract NAS 1-10860, Evaluation of a Metal Shear Web Selectivity Reinforced with Filamentary Composites for Space Shuttle Application. Three large scale advanced composite shear web components were tested and analyzed to evaluate application of the design concept developed in Phase I to a Space Shuttle Orbiter thrust structure. The shear web design concept consisted of a titanium-clad +45° boron/epoxy web laminate stiffened with vertical boron/epoxy reinforced aluminum stiffeners. The design concept was evaluated to be efficient and practical for the application that was studied. Because of the effects of buckling deflections, a requirement is identified for shear buckling resistant design to maximize the efficiency of highlyloaded advanced composite shear webs. An approximate analysis of prebaking deflections is presented and computer-aided design results, which consider prebaking deformations, indicate that the design concept offers a theoretical weight saving of 31 percent relative to all metal construction. Recommendations are made for design concept options and analytical methods that are appropriate for production hardware.