A plate a x b x t is subjected to a normal tensile stress «£ = a on its a x t sides and a compressive stress c^ = - a on its b x t sides. If all edges are simply supported show that the minimum value...

A plate a x b x t is subjected to a normal tensile stress «£ = a on its a x t sides and a compressive stress c^ = - a on its b x t sides. If all edges are simply supported show that the minimum value of critical buckling stress is given by («&)„ = (8 s-aD)/(fta ) for one halfwave in the y-direction. To what values of r = aib does this minimum apply?