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An experimental and analytical study of the vibration characteristics of a series of boron/epoxy composite panels with all layers having the same filament orientation has been conducted. Nodal patterns and natural frequencies are found to be highly dependent on the filament angle. Frequencies change by as much as 90 percent with a 30-deg change in the filament angle. Measured damping coefficients are only moderately higher than those of comparative aluminum panels. There is no strong correlation between the filament angle and the amount of damping. In general, calculations based on a finite element mathematical model are in good agreement with the experimental data.
composite materials, composite beams, filaments, laminates, boron, epoxy resins, aluminum, panels, reinforcement (structures), orthotropism, vibration, vibration damping, resonant frequency, nodes, dynamic structural analysis
Aerospace engineer, NASA Langley Research Center, Hampton, Va.