Uniaxial Compressive and Shear Buckling in Orthotropic Sandwich Plates by an Improved Theory

Abstract It has been known for some time that the effect of shear deformation on buckling load is important for built-up columns, sandwich plates, and composite-material elements. In 1948, Haringx found that a sufficiently short helical spring cannot be made to buckle and that the transverse force acting in the plane is normal to the central line in the unloaded state but not in the deflected state. Here, the Haringx approach is extended to problems of compressive and shear buckling in rectangular sandwich plates. These problems are solved by the Galer-kin and energy methods, respectively. The results obtained show that the compressive and shear buckling loads calculated by the present theory are in good agreement with existing experimental data. The predicted buckling loads are greater than those predicted by classical Engesser-type sandwich plate theory, and the differences become greater as the shear flexibility increases.

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