Abstract: The flexural vibration of symmetric honeycomb panels having simple support boundary conditions is investigated by using the classical plate theory, first-order shear deformation plate theory, third-order shear deformation plate theory. The honeycomb core of cells is modeled as a layer of orthotropic material whose physical and mechanical properties are determined by using the corrected Gibson’s formula. The comparative studies conducted on aluminum honeycomb panels indicate that both the classical and first-order shear deformation plate theories are inadequate for the flexural vibration of honeycomb panels. Using the Reddy third order shear deformation plate theory, the effects of panel thickness, core thickness and cell angle on flexural vibration of symmetric honeycomb panels are investigated and the corresponding curve figure is drawn. The curve figure is instructive to application of honeycomb panels in engineering.

Key words: Flexural vibration, Honeycomb, Natural frequencies, Sandwich