Question

Unit of torsional rigidity?

Answer 1

Torsional rigidity:

1. Torsional stiffness is sometimes defined as the torque necessary to create a unit radian angle of twist per unit shaft length.
2. Torsional stiffness is calculated as the sum of shear modulus (G) and polar moment of inertia (J). Torsional rigidity measures a material's resistance toward angular distortion.
3. The SI unit of torsional rigidity is ${\mathrm{Nm}}^2$.