![]() The polar moment of inertia, also known as second polar moment of area, is a quantity used to describe resistance to torsional deformation (deflection), in cylindrical objects (or segments of cylindrical object) with an invariant cross-section and no significant warping or out-of-plane deformation. This equation is equivalent to I = π D 2 / 64 when we express it taking the diameter (D) of the circle.Īlso know, what is polar moment of inertia of circle? Here, r is the radius and the axis is passing through the centre. ![]() Moment of inertia of a circle or the second- moment area of a circle is usually determined using the following expression I = π R 4 / 4. ![]()
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