A part with a machined surface is subjected to a reversed bending stress of 70,000 psi for 5% of the time, a reversed bending stress of 55,000 psi for 15% of the time, and a reversed bending stress of 40,000 psi for 80% of the time. If σe = 33,000 psi and σu = 81,000 psi use Basquin’s equation to find the expected life of the part in cycles.
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