Elastic-plastic buckling analysis of rectangular plates subjected to biaxial loads

In order to calculate the budding load of a rectangular plate, the analytic al approach is used in this study. The plate is assumed to be simply suppor ted on four edges and loaded by uniform stresses along the edges. If the pl ate is slender, the buckling is elastic. However, if the plate is sturdy, i t buckles in the plastic range. Then, the instantaneous moduli in the const itutive equations depend on the external loading. In this study, the elastic and plastic buckling equations are derived for r ectangular plates under biaxial loading, and the corresponding interaction curves are presented. The influences of aspect ratios, load ratios and hard ening factors on the buckling stresses are investigated for rectangular pla tes. From the plastic buckling analysis, the optimal combination of loads i s given for the buckling strength.