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Question
A cylindrical bar of ductile cast iron is subjected to reversed and rotating-bending tests; test results (i.e., $S-N$ behavior) are shown in Figure 8.20. If the bar diameter is $9.5 \mathrm{~mm}$, determine the maximum cyclic load that may be applied to ensure that fatigue failure will not occur. Assume a factor of safety of $2.25$ and that the distance between loadbearing points is $55.5 \mathrm{~mm}$.
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Step 1
The formula for the maximum stress in a rotating bending test is given by: \[ \sigma_{\text{max}} = \frac{16M}{\pi d^3} \] where \(M\) is the bending moment and \(d\) is the diameter of the bar. Show more…
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