A bar of steel has the minimum properties Se = 40 kpsi, Sy = 60 kpsi, and Sut = 80 kpsi. The bar is subjected to a steady torsio
nal stress of 15 kpsi, an alternating torsional stress of 10 kpsi, and an alternating bending stress of 12 kpsi. Find the factor of safety guarding against a static failure, and the factor of safety guarding against a fatigue failure, and find the expected life of the part. For the fatigue analysis use:
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