A cylindrical 1045 steel bar (Figure 9.41) is subjected to repeated tension–compression st...

A cylindrical 1045 steel bar (Figure 9.41) is subjected to repeated tension–compression stress cycling along its axis. If the load amplitude is 22,000 N (4950 lbf), compute the minimum allowable bar diameter to ensure that fatigue failure will not occur. Assume a factor of safety of 2.0.

Figure 9.41 Stress magnitude S versus the logarithm of the number N of cycles to fatigue failure for red brass, an aluminum alloy, and a plain carbon steel.