1. A shaft is made from AISI 1040 hot rolled steel with Su = 496 MPa, Sy = 290 MPa with 18% elongation. The actual endurance strength, Sn', is known as 160 MPa. It is subjected to a steady torque of 100 N-m and maximum bending moment of 180 N-m. Find the diameter of the shaft using a factor of safety of 2.5 in all cases, if the shaft is a a. non-transmission shaft (not rotating) b. transmission shaft (rotating)

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Torsion

In mechanical engineering, torque, torsion, and twisting moment are three of the most important concepts which have different meanings. Torque is the consequence of a moment of a force that produces an angular acceleration in a body or induces rotational kinetic energy in a body. For instance, in an automobile, the power transmission shaft is a body that is always under rotation due to the external torque acting on it, this torque is created by the engine.