Q.1 / A shaft is loaded in bending and torsion such that M. = 600 lbf. in , T. = 400 lbf. in , Min = 500 lbf in , and Tm = 300 lbfin. For the shaft , S. = 100 kpsi and S , = 80 kpsi, and a fully corrected endurance limit of Se = 30 kpsi is assumed. Let k , = 2.2 and Ks = 1.8 . With a design factor of 2.0 determines the minimum acceptable diameter of the shaft using the (a) DE - Gerber criterion . (b) DE - elliptic criterion. (c) DE - Soderberg criterion. ( d ) DE Goodman criterion . Discuss and compare the results .