Simply Supported Long Rectangular Plate Under Combined Axial Load and Normal Pressure

Normal pressure was found to make the buckling load larger than its value for zero pressure; the theoretical buckling load was larger by a factor of 3.1 for one combination of axial load and normal pressure. Normal pressure caused a decrease in effective width at loads below the normal buckling load and in increasse in effective width for loads somewhat greater than the normal buckling load; however, normal pressure caused less than 1 percent increase in effective width for average compressive strains greater than six times the buckling strain. for zero normal pressure.