Abstract
This paper presents buckling of unstiffened/stiffened orthotropic foam sandwich cylindrical shells simply supported at both ends. For the unstiffened cylinders, five equations of equilibrium are derived in terms of the mid-surface displacements and cross-section rotations according to the thick shell theory. Critical buckling loads are obtained by modal expansion under the loading conditions of axial compression, lateral pressure and torsional load with reasonable results. The stiffened cases are investigated by using the principle of minimum potential energy and smear-out technique typical of the fewer discrete and closely spaced small stiffeners. Critical buckling loads and mode shapes are obtained for cylinders with 4 and 20 stiffeners respectively.
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