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Slide 1

In this presentation we will define what torque and torsion are and we will derive the theory of torsion of circular shafts. Implications of torsion theory to the failure of materials is also discussed. Torsion refers to the twisting of a shaft loaded by torque, or twisting couples. For example, in the generation of electricity shafts carry torque from the turbine to the generator. An example of torsional loading is shown here. In this example we load the shaft by two equal and opposite forces acting on a bar perpendicular to the shaft. The moment generated by these forces is sometimes called a couple. This type of loading is shown in the figure. Each of the two forces tend to twist the shaft about its longitudinal axis. The magnitude of the moment due to this couple is given by P times d, where, P is the applied force and d is the distance between the lines of action of the forces. This twisting couple is also called the ‘Torque’ or ‘Twisting Moment’.


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