An 8.0 mm (0.31 in.) diameter cylindrical rod fabricated from a red brass alloy (Figure) is subjected to reversed tension-compression load cycling along its axis. If the maximum tensile and compressive loads are +7500 N (1700lb_f) and -7500 N (-1700lb_f), respectively, determine its fatigue life. Assume that the stress plotted in Figure 8.34 is stress amplitude.

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80 500 70 60 400 50 1045 steel 300 40 2014-T6 aluminum alloy 30 200 20 100 10 Red brass 10 107 104 105 10 10° 100 1010 Cycles to failure. N Stress amplitude. S (MPa) (sd 01) epnydwe ssens