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)
Stall Flutter of Graphite/Epoxy Wings with Bending-Torsion Coupling
1988
25 pages
Report
No indication
English
Aircraft , Aerodynamics , Aerodynamic forces , Bending , Coupling(Interaction) , Epoxy compounds , Graphite , Torsion , Wings , Amplitude , Angle of attack , Coefficients , Fairings , Foam , Fourier analysis , Moments , Nonlinear systems , Polystyrene , Range(Extremes) , Theory , Wind tunnel tests , Stall flutter
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