A cylindrical rod of diameter 12.5 mm (0.50 in.) fabricated from a 2014-T6 alloy (Figure 9...

A cylindrical rod of diameter 12.5 mm (0.50 in.) fabricated from a 2014-T6 alloy (Figure 9.41) is subjected to a repeated tension–compression load cycling along its axis. Compute the maximum and minimum loads that will be applied to yield a fatigue life of 1.0 × 107 cycles. Assume that the stress plotted on the vertical axis is stress amplitude, and data were taken for a mean stress of 50 MPa (7250 psi).

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.