Torsional moments affect the rods as shown in the figure. a- Draw the torque diagram on the rod. b- Draw the stress distributions on the bars on the sections. c- Determine whether the torsion moments applied to the rod can be safely carried by this rod. Note: - For steel: Tallowable: 120 MPa G= 83 GPa  -For aluminum: Tallowable: 55 MPa G=28 GPa -Tip C is allowed to rotate no more than 4 degrees

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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.