Question

A shaft is loaded in bending and torsion such that Ma = 70 N · m, Ta = 40 N · m, Mm = 50 N · m, and Tm = 30 N · m. For the shaft, Su = 700 MPa and Sy = 560 MPa, and a fully corrected endurance limit of Se = 210 MPa is assumed. Let Kf = 2.2 and Kfs = 1.8. With a design factor of 2.0 determine 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.

Answer 1