6.1 INTRODUCTION
In certain field applications, like in work-shops and factories, a turning force is applied to transmit energy by rotation. For example, this turning force is applied to the rim of a pulley or through a key to the shaft or at any required point from the axis of shaft. The product of this turning force and the corresponding distance is known as the torque. This distance is one between the point of application of the force and axis of the shaft. Torque is also referred to as turning moment or twisting moment. Thus, a member is considered to be under torsion if it transmits the moments of a couple in a direction normal to the plane of the couple.
Torsion is one of the four basic modes by which loads are transmitted from one portion ...
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