A cylindrical rod of diameter 6.7 \mathrm{~mm} fabricated from a 70 \mathrm{Cu}-30 \mathrm{Zn} brass alloy is subjected to rotating-bending load cycling; test results (as S-N behavior) are shown in Figure 8.20. If the maximum and minimum loads are +120 \mathrm{~N} and -120 \mathrm{~N}, respectively, determine its fatigue life. Assume that the separation between loadbearing points is 67.5 \mathrm{~mm}.
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