QUESTION

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2. A cylindrical ductile cast iron bar is subjected to reversed rotating-bending stress cycling, which yielded the test results presented in Figure 8.21. If the maximum applied load is $1250 \mathrm{~N}$, compute the minimum allowable bar diameter to ensure that fatigue failure will not occur. Assume a factor of safety of 2.45 and that the distance between loadbearing points is $47.5 \mathrm{~mm}$. (10 points)

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