Revisit Problem 7.34 to account for a 10% variation in torque and the alternating variation in…

Revisit Problem 7.34 to account for a 10% variation in torque and the alternating variation in bending due to rotation. Assume a machined condition, a reliability of 99.99%, stress concentration factor of 2.0, and ambient temperature. What is the fatigue safety factor for this new case?

Problem 7.34

A propeller shaft of a large cruise ship rotates very slowly. The maximum bending is 25 [kN m] or 221 [klb in]. The maximum torsion is 2 [MN m] or 17.7 [Mlb in]. The propeller shaft diameter is 610 [mm] or 24 [in]. Is it safe to use a propeller shaft material as hot rolled AISI 1030 or ISO C30? Find the safety factor for an appropriate static theory of failure. What is the safety factor if one uses hot rolled AISI 1020 or ISO C20?

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