A high strength drill rod used for boring a hole in the earth has a diameter of 50 mm. The allowable shear stress in the steel is 120 MPa and the shear modulus is G=80 GPa 1. Determine the required length of the rod so that one end of the rod can be twisted 4° with respect to the other end without exceeding the allowable stress. 2. Determine the torsional stiffness in N.m. 3. Determine the allowable shear strain of the rod.

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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.