Current Articles | Archives TorsionStaff posted on October 23, 2006 | Torsion The shear stress in beam due to torque can be derived with three principals: Geometry, Hooke's Law, and Equilibrium. Circular Members Geometry: g = shear strain f = angle of twist q = angle of twist / unit length Hooke's Law: Equilibrium: Relationship between Torque and Shear: T = G · q · J Polar Moment of Area for Circular Shapes: Angle of Twist: Circular Shaft: Hollow Shaft: Thin Walled Tube: J = 2pr3t Please enable JavaScript to view the comments powered by Disqus.