STP546

    Evaluation of Experimental Methods for Determining Dynamic Stiffness and Damping of Composite Materials

    Published: Jan 1974


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    Abstract

    Various methods potentially usable for determining dynamic stiffness and damping of composite materials are reviewed. Of these, the following most widely used techniques are singled out for more detailed discussion: free vibration, pulse propagation, and forced vibration response. To illustrate the usefulness and validity of dynamic property data, their application in dynamic analyses and comparison with measured structural response are described for the following composite-material structures: free-free sandwich beam with glass-epoxy facings, clamped-edge sandwich plate with similar facings, free-end sandwich conical shell with similar facings, and boron-epoxy free plate with layers arranged at various orientations.

    Keywords:

    analyzing beams (supports), composite materials, damping, data reduction, dynamic stiffness, laminates, panels, resonance, shells (structural forms), tests, vibration, wave propagation


    Author Information:

    Bert, CW
    Professor and director, School of Aerospace, Mechanical and Nuclear Engineering, The University of Oklahoma, Norman, Okla.

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


    Paper ID: STP35493S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP35493S


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