A shaft made of AISI 1050 CD steel is loaded in bending and torsion such that Ma = 610 lbĀ·in, Ta = 375 lbĀ·in, Mm = 469 lbĀ·in, and Tm = 287 lbĀ·in. The shaft has a fully corrected endurance limit of Se = 30 ksi and at the critical stress location, Kt = 2.3 and Kfs = 1.9. Estimate the true fracture strength as being 50 ksi greater than the ultimate strength. The design factor is 2.5.
A) Determine the minimum acceptable diameter of the shaft using the DE-Morrow criterion. B) Determine the minimum acceptable diameter of the shaft using the DE-Gerber criterion: