7. A cylindrical steel bar is subjected to repeated compression-tension stress cycling along its axis. The mean stress is zero (0). If the maximum tensile load applied to the bar is 15,000 N, calculate the minimum allowable bar diameter (in mm) to ensure that fatigue failure will not occur. Assume a Safety Factor of 3. Show all work (4). 500 450 400 - S 350 300 250 10 104 105 106 107 108 N S (MPa)

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