A steel part is loaded with a combination of bending, axial, and torsion such that the following stresses are created at a particular location: Bending Completely reversed, with a maximum stress of 60 MPa Axial Constant stress of 20 MPa Torsion Repeated load, varying from 0 MPa to 70 MPa Assume the varying stresses are in phase with each other. The part contains a notch such that Khending = 1.4, Kfasial= 1.1, and Krsion 2.0. The material properties 300 MPa and S, = 400 MPa. The completely adjusted endurance limit is found to be S160 MPa.

Find the factor of safety for fatigue based on infinite life, using are the Goodman criterion.