An analytical and experimental investigation is made of the non-linear, large amplitude, high angle of attack, stall flutter behavior of cantilevered graphite/epoxy wings. Ten six-ply graphite/epoxy wings with a wide range of bending-torsion characteristics were constructed and styrofoam fairings epoxied to these to form NACA-0012 airfoil shapes. Wind tunnel tests on these cantilevered wings revealed torsional and bending stall flutter limit cycles, depending on the layup. Reasonable agreement with steady, non-linear theory and with unsteady, linear theory was found. Fourier analysis applied to the ONERA 2-dimensional, non-linear, unsteady, aerodynamic model shows reasonable agreement with 2-dimensional experiments on aerodynamic force and moment coefficients. (jes)


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    Title :

    Stall Flutter of Graphite/Epoxy Wings with Bending-Torsion Coupling


    Contributors:
    P. Dunn (author) / J. Dugundji (author)

    Publication date :

    1988


    Size :

    25 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Nonlinear stall flutter of wings with bending-torsion coupling

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