Question

A transmission shaft carries a pulley midway between the two bearings. The bending moment at the pulley varies from 300 to 550 Nm, as the torsional moment in the shaft varies from 75 to 225 Nm. The frequencies of variation of bending and torsional moments are equal to the shaft speed. The shaft is made of a steel having Sut = 550 MPa and Syt = 370 MPa. The corrected endurance limit of the shaft is 190 MPa. Determine the diameter of the shaft using a factor of safety of 2.

Answer 1