6.1 Torsional Shearing Stress and Strain
In several machines a torque has to be transmitted from one plane to another parallel plane. For example torque from an electric motor may have to be transmitted to a compressor or other machine. The simplest device to accomplish such torque transmission is a cylindrical shaft which connects driving or torque producing machine to driven machine. For the purpose of studying the nature of stress distribution and state of stress at any point in the shaft a portion of the shaft along its length will be selected and equal and opposite torques will be assumed to be acting at the two ends of the shaft. All considerations, in the beginning, will be restricted to circular section (or cylindrical) ...