STP497

    Vibration Characteristics of Unidirectional Filamentary Composite Material Panels

    Published: Jan 1972


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    Abstract

    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.

    Keywords:

    composite materials, composite beams, filaments, laminates, boron, epoxy resins, aluminum, panels, reinforcement (structures), orthotropism, vibration, vibration damping, resonant frequency, nodes, dynamic structural analysis


    Author Information:

    Clary, RR
    Aerospace engineer, NASA Langley Research Center, Hampton, Va.


    Paper ID: STP27761S

    Committee/Subcommittee: D30.05

    DOI: 10.1520/STP27761S


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