Springfield VA 22151 20. ABSTRACT (Continue on reverse side It necesaery and Identify by block number) f The degree of success or failure for meeting tbe space and ballistic mission requirements of rock,.t launched vehicles depends greatly on the ability to accurately predict propu.sion performance. Solid rocket motor performance predictions are possible by establishing a correlation between fvll-scale motor performance, and small ballistic test motors, liquid strand urn rate tests and/or solid strand burn rate tests. I DOM 1473 EDITION OF I NOV 6S IS OBSOLETE SDECUOIT C
This paper will present work completed in the area of integrally damped composites. The objective of the project was to evaluate the effectiveness of integrated damping layers in composites, to identify the effect of the damping layer on the strength of the composite, and to define fabrication problems associated with integrating the damping layer into the composite.The study addressed two types of composite panels which included flat panels and filament wound rectangular isogrid panels fabricated from IM-7 graphite fiber and ICI Fiberite 977-2 epoxy resin. With each of the selected fiber orientations, one panel was fabricated with a 0.002 inch layer of damping material as the center layer of the composite; while a second panel, a control panel, did not have the damping layer installed. The test specimens were cured in an autoclave at 350°F.All of the composite panels were tested dynamically to determine the dynamic stiffness and modal damping as a function of temperature. Tensile, flexure, and compression tests also were run on the panels at room temperature.The paper presents the details of the fabrication and curing procedures used in the construction of the composite panels and the detailed results of the static and dynamic tests on the damped and undamped panels.
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