A wheel of diameter 3.3 in and width 1.3 in carrying a load 250 lbf rolls on a flat rail. Take the wheel material as steel and the rail material as cast iron. Assume the figure given, which is based on a Poisson's ratio of 0.3, is applicable to estimate the depth at which the maximum shear stress occurs for these materials. At this critical depth, calculate the Hertzian stresses Ox, Oy, Oz, and Tmax for the wheel. Ratio of stress to Pmax 1.0 0.8 0.6 0.4 0.2 0. T 0 0 0.5b b Tmax 1.5b 2b Distance from contact surface The Hertizian stresses are as follows: Ox for the wheel = kpsi Oy for the wheel = kpsi Oz for the wheel kpsi Tmax for the wheel = kpsi 2.5b 3b