LAYERWISE THEORY FOR DYNAMIC BUCKLING AND POSTBUCKLING OF LAMINATED COMPOSITE CYLINDRICAL-SHELLS

A general layerwise theory for dynamic buckling and postbuckling of im perfect multilayered composite circular cylindrical shells is introduc ed. In contrast to the conventional displacement-based layerwise theor ies that are more suitable for semianalytical solutions and kinematic boundary conditions, the present method includes the displacement and stress components at the same time. Thus, the method provides an effic ient formulation where both kinematic and force boundary conditions ca n be exactly satisfied, To use the exact expressions of strain and str ess components, the full Green's strain tensor for large deflections o f circular cylinders is employed. Then almost no simplification is mad e in the development of the governing equations. The applied loads can he composed of various mechanical loads (axial compression, external pressure, external fluid pressure, and torsion or a combination of the m). Accuracy and convergence of the present theory, in comparison with the three-dimensional elasticity approaches proposed so far, are high er and more effective. Finally, a few examples of various references t hat have used different theories are reexamined for comparison purpose .