Accession Number : ADA307749

Title :   Combined Compressive and Shear Buckling Analysis of Hypersonic Aircraft Structural Sandwich Panels.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION EDWARDS AFB CA DRYDEN FLIGHT RE SEARCH CENTER

Personal Author(s) : Ko, William L. ; Jackson, Raymond H.

PDF Url : ADA307749

Report Date : MAY 1991

Pagination or Media Count : 38

Abstract : The combined-load (compression and shear) buckling equations were established for orthotropic sandwich panels by using the Rayleigh-Ritz method to minimize the panel total potential energy. The resulting combined-load buckling equations were used to generate buckling interaction curves for super-plastically-formed/diffusion-bonded titanium truss-core sandwich panels and titanium honeycomb-core sandwich panels having the same specific weight. The relative combined-load buckling strengths of these two types of sandwich panels are compared with consideration of their sandwich core orientations. For square and nearly square panels of both types, the combined load always induces symmetric buckling. As the panel aspect ratios increase, antisymmetric buckling will show up when the loading is shear-dominated combined loading. The square panel (either type) has the highest combined buckling strength, but the combined load buckling strength drops sharply as the panel aspect ratio increases. For square panels, the truss-core sandwich panel has higher compression-dominated combined-load buckling strength. However, for shear dominated loading, the square honeycomb-core sandwich panel has higher shear-dominated combined load buckling strength.

Descriptors :   *SHEAR PROPERTIES, *BUCKLING, *SANDWICH PANELS, CORES, ORIENTATION(DIRECTION), STRENGTH(MECHANICS), SYMMETRY, DROPS, WEIGHT, EQUATIONS, POTENTIAL ENERGY, HYPERSONIC AIRCRAFT, ASPECT RATIO, AIRCRAFT PANELS, COMPRESSIVE PROPERTIES, SANDWICH CONSTRUCTION.

Subject Categories : Aircraft
      Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE