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This project involved an experimental investigation into the effect of a high random acoustic loading, in combination with a static shear load near initial buckling, on the dynamic response of integrally stiffened graphite/epoxy panels. The program covered the design, fabrication, finite-element analysis, and testing of a J-stiffened monolithic panel and a J-stiffened minisandwich panel. The minisandwich panel had a syntactic core containing glass micro-balloons. The panels were designed to an initial shear buckling load of 17.51 kN/m (100 lb/in.). The predicted initial shear buckling load was, generally, in good agreement with the measured load. The damping, in all of the modes, increased significantly on approaching buckling. The root-mean-square strain, at the critical panel location, increased by as much as 30% in the vicinity of panel buckling, in spite of the increase in the damping.
testing, composite panels, integrally stiffened, shear buckling, dynamic response, damping, random acoustic loading, measured strain
Research specialist senior, Lockheed-California Co., Burbank, CA