An experimental investigation was made to validate a theoretical parabolic interaction curve for the elastic buckling of flat rectangular plates under combined shear and longitudinal compression loads. The four flat rectangular plates tested formed the sides of a square box having corner angles. Although some of the experimentally determined points lie above and others "below the theoretical interaction curve, the average of the individual experimental points plotted very closely to this theoretical curve recommended for design use. The experimental results were *also compared with a theoretical interaction curve for the walls of a square tube without corner angles.
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