Accession Number : ADA307268

Title :   Supersonic Flutter of Simply Supported Isotropic Sandwich Panels.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Erickson, Larry L. ; Anderson, Melvin S.

PDF Url : ADA307268

Report Date : APR 1966

Pagination or Media Count : 54

Abstract : A theoretical solution using two-dimensional static aerodynamics is presented for the supersonic flutter characteristics of flat rectangular isotropic sandwich panels with simply supported edges. Tables and charts giving the values of the dynamic-pressure parameter required for flutter are presented for various values of panel length-width ratio, shear flexibility, and midplane stress. It is found that a decrease in transverse shear stiffness will usually lower the dynamic pressure required to induce flutter. However, for certain cases of midplane tension the opposite effect occurs. Panel mode shapes are also presented and a comparison is made of the two-mode Galerkin, the pre-flutter, and the exact flutter solutions.

Descriptors :   *SUPERSONIC CHARACTERISTICS, *FLUTTER, MATHEMATICAL MODELS, MATRICES(MATHEMATICS), SHEAR MODULUS, STIFFNESS, AIR FLOW, APPROXIMATION(MATHEMATICS), SHEAR STRESSES, AERODYNAMIC LOADING, PARTIAL DIFFERENTIAL EQUATIONS, LEADING EDGES, MACH NUMBER, TWO DIMENSIONAL FLOW, NUMERICAL METHODS AND PROCEDURES, SUPERSONIC FLOW, FREE STREAM, PRESSURE DISTRIBUTION, DYNAMIC PRESSURE, BENDING STRESS, SANDWICH PANELS, TRAILING EDGES, BENDING MOMENTS.

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE