A cylindrical 1045 steel bar (Figure 8.34) is subjected to repeated compression-tension stress cycling along its axis. If the load amplitude is 66,700 N (15,000 lbf),compute the minimum allowable bar diameter to ensure that fatigue failure will not occur. Assume a safety factor of 2.0. From Figure 8.34 (below), the fatigue limit stress amplitude for this alloy is 310 MPa (45.000 psi).
