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

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Oct 25, 1988
Accession Number
ADA203077

Entities

People

  • John Dugundji
  • Peter Dunn

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Forces
  • Agreements
  • Air Force
  • Aircrafts
  • Amplitude
  • Coefficients
  • Composite Materials
  • Couplings
  • Equations
  • Equations Of Motion
  • Fourier Analysis
  • Graphitic Materials
  • High Angles
  • Three Dimensional
  • Two Dimensional
  • Wind Tunnel Tests
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Aerodynamics/Aeronautics.
  • Structural Dynamics.