Accurate Results for Free Vibration of Doubly Curved Shallow Shells of Rectangular Planform (Part.2 Thickness effect)

This paper presents a follow-up study of previous work that deals with the free vibration moderately thin isotropic shallow shells under general edge conditions. The same semi-analytical method is used in this for identical shape and degree curvature doubly curved geometry, accurate natural frequencies are tabulated wide range shell Emphasis made, however, to present frequency parameters very thickness (representative length/shell thickness=100). In numerical experiments, convergence test made against series terms case shells. Twenty-one sets three shapes (spherical, cylindrical hyperbolic paraboloidal shells) two ratios. These papers (Part.1 2) will constitute standard area rectangular planform serve future comparison practical design purpose.