Shortening Effect on Buckling Behavior of Reddy Plates and Prismatic Plate Structures
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abstract
A closed-form solution based on the Reddy third-order shear deformation plate theory is proposed for the buckling of both flat and stiffened plates, simply supported on two opposite edges. The effect of the nonlinear straindisplacement terms, usually neglected under the von Krmn hypothesis, on the buckling of thick plates is investigated, and the equations governing the critical behavior considering the full GreenLagrange strain tensor and the second PiolaKirchhoff stress tensor are derived using the principle of minimum potential energy. The general Levy-type approach is employed, and the accuracy and effectiveness of the proposed formulation is validated through direct comparison with analytical and numerical results available in the literature. The parametric analyses performed for different geometrical ratios show that the von Krmn hypothesis holds only for thin flat plates whereas it can significantly overestimate buckling loads for stiffened plates, for which the buckling mode entails comparable in-plane and out-of-plane displacements.
