Dynamic stability of cylindrical panels with transverse shear effects

The dynamic stability of simply!supported\ isotropic cylindrical panels under combined static and periodic axial forces are investigated[ An extension of Donnell|s shell theory to a _rst!order shear deformation theory is used\ and a system of Mathieu Hill equations are obtained via a normal!mode expansion\ and the parametric resonance response was analyzed using Bolotin|s method[ Results are compared with those obtained using the classical shell theory[ The e}ects of the thickness!to!radius ratio on the instability regions are examined in detail