A shaft is loaded in bending and torsion such that Ma = 35 N · m, Ta = 40 N · m, Mm = 45 N · m, and Tm = 15 N · m. For the shaft, Su = 600 MPa and Sy = 420 MPa, and a fully corrected endurance limit of Se = 190 MPa is assumed. Let Kf = 2.1 and Kfs = 1.7. With a design factor of 2.0 determine the minimum acceptable diameter of the shaft using the

(a) DE-Gerber criterion.
(b) DE-ASME Elliptic criterion.
(c) DE-Soderberg criterion.
(d) DE-Goodman criterion.
Discuss and compare the results.