The aeroelastic stability of titanium and composite blades of low aspect ratio is examined over a range of design parameters, using a Rayleigh-Ritz formulation. The blade modes include a plate-type mode to account for chordwise bending. Chord-wise flexibility is found to have a significant effect on the unstalled supersonic flutter of low-aspect-ratio blades, and also on the stability of tip sections of shrouded fan blades. For blades with a thickness of less than approximately 4 percent of chord, the chordwise, second bending, and first torsion branches are all unstable at moderately high supersonic Mach numbers. For composite blades, the important structural coupling between bending and torsion cannot be modeled properly unless chordwise bending is accounted for. Typically, aft fiber sweep produces beneficial bending-torsion coupling that is stabilizing, whereas forward fiber sweep has the opposite effect. By using crossed-ply laminate configurations, critical aeroelastic modes can be stabilized.
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April 1987
Research Papers
Aeroelastic Behavior of Low-Aspect-Ratio Metal and Composite Blades
J. F. White, III,
J. F. White, III
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
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O. O. Bendiksen
O. O. Bendiksen
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
Search for other works by this author on:
J. F. White, III
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
O. O. Bendiksen
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
J. Eng. Gas Turbines Power. Apr 1987, 109(2): 168-175 (8 pages)
Published Online: April 1, 1987
Article history
Received:
February 21, 1986
Online:
October 15, 2009
Citation
White, J. F., III, and Bendiksen, O. O. (April 1, 1987). "Aeroelastic Behavior of Low-Aspect-Ratio Metal and Composite Blades." ASME. J. Eng. Gas Turbines Power. April 1987; 109(2): 168–175. https://doi.org/10.1115/1.3240020
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