Abstract
An analytical and experimental investigation was made of the aeroelastic deflections, divergence, and flutter behavior of both unswept and 30 deg forward-swept rectangular, graphite/epoxy, cantilevered plate-type wings, with various amounts of bending-torsi on stiffness coupling. The analytical investigation used a Rayleigh-Ritz formulation together with incompressible three-dimensional Weissinger L-method aerodynamics for the divergence, and incompressible two-dimensional unsteady strip theory for the flutter. A semiempirical attempt was also made to obtain the steady airload deflections of the wing including the nonlinear stall behavior. Experiments on 13 wing configurations showed divergence and bending-torsion flutter at low angles of attack, and torsion and bending stall flutter at higher angles of attack. Good agreement with theory was found for the divergence and bending-torsion flutter cases at low angles of attack, and for the nonlinear steady wing deflections at high angles of attack. The +15° ply configuration was efficient in relieving the adverse divergence effect of the forward-swept wing.
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