Ahollow shaft with an external diameter of 150 mm transmits a maximum torque of  13 kNm. The shaft length is 5 m,and the maximum shear stress is limited to 40  MPa. If G = 84 x 103N/mm2 , calculate; 2.1 the internal diameter of the shaft. 2.2 the angle of twist in degrees. 2.3 the minimum shear stress in the shaft.

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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.