The compressive stress for buckling is calculated for a rectangular flat sandwich plate with loaded edges simply supported and unloaded edges rigidly clamped. In the calculations Hoff's differential equations are integrated by Leggett's method in order to obtain lower bounds and by Galerkin's method to establish upper bounds. The true values of the buckling stress are estimated as the arithmetic means of these bounds and are presented in a diagram which covers the entire practical range of the geometric and mechanical quantities involved. The theoretical results are in satisfactory agreement with results of tests carried out at the Forest Products Laboratory.
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