A 0.78 in diameter rotating shaft with a 0.23 in diameter transverse hole is made of...

 

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A 0.78 in diameter rotating shaft with a 0.23 in diameter transverse hole is made of cold drawn steel having Sut = 80 ksi. The shaft is subjected to a completely reversed torsional loading. Surfaces in the vicinity of the hole have a machined finish. Assuming the temperature and the reliability factors as 1, estimate (a) the actual endurance limit (b) the fatigue stress concentration factor (c) the corresponding factor of safety for a completely reversed torque of 443 lb in. A 0.78 in diameter rotating shaft with a 0.23 in diameter transverse hole is made of cold drawn steel having Sut = 80 ksi. The shaft is subjected to a completely reversed torsional loading. Surfaces in the vicinity of the hole have a machined finish. Assuming the temperature and the reliability factors as 1, estimate (a) the actual endurance limit (b) the fatigue stress concentration factor (c) the corresponding factor of safety for a completely reversed torque of 443 lb in.