Polar moment of inertia
Polar moment of inertia is a measure of a circular beam's ability to resist torsion. It is required to calculate the twist of an beam subjected to a torque. It is analogous to the area moment of inertia, which characterizes a beam's ability to resist bending and is required to calculate displacement.
The larger the polar moment of inertia, the less the beam will twist, when subjected to a given torque.
Unlike other forms of inertia, polar moment of inertia has units of length4 (SI m4)
See also moment (physics).
- Torsion of Shafts - engineeringtoolbox.com
- Elastic Properties and Young Modulus for some Materials - engineeringtoolbox.com