Polar Moment of Inertia

The polar moment of inertia or polar second moment of area is a measure of an object's ability to resist torsion as a function of its shape. It is one aspect of the second moment of area linked through the perpendicular axis theorem. The planar second moment of area uses a beam's cross-sectional shape to describe its resistance to deformation (bending) when subjected to a force applied in a plane parallel to its neutral axis whereas, the polar second moment of area uses a beam's cross-sectional shape to describe its resistance to deformation (torsion) when a moment (torque) is applied in a plane perpendicular to the beam's neutral axis.

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Ateeb Ahmad Khan
Assistant Professor
Mechanical Engineering Department, AMU, Aligarh
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