Review of Torsion – Fusion of Engineering, Control, Coding, Machine Learning, and Science

Consider a cylinder shown in figure below.

The torque $T$ is applied at the top plane of the cylinder. The bottom of the cylinder (passing through the point $B$ ) is fixed. Consequently, the applied torque creates deformation. Consider two points $A$ and $A'$ at the top. The applied torque will cause displacement of point $A$ to point $A'$ . The described angle $\phi$ is called the angle of twist. On the other hand, the angle $\gamma$ is called shear strain.