Question: A 2 0 - mm - diameter shaft with machined finish is made of cold - drawn steel having S u = 5 5 0

A 20-mm-diameter shaft with machined finish is made of cold-drawn steel having Su=550MPa and Sy=462MPa. Assume 90% reliability is needed. Estimate the safety factor with respect to infinite fatigue life for a completely reversed torque of 50N*m. Make reasonable assumptions if any data is missing.
A 2 0 - mm - diameter shaft with machined finish

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