The rectangular bar with oval opening in Figure P4.1 is loaded in compression through two hardened steel balls. Estimate the maximum compressive stress in each of the sections A to E. Assume that an element of the bar once deformed to the yield point will continue to deform with no increase in stress; i.e., the material follows an idealized stress-strain curve. The bar is one in. thick and machined from steel with Sy = 50 ksi, and the balls are hardened steel.
