#### Polar Area Moment of Inertia, Polar Section Modulus Properties of Common Shapes

Engineering Calculators
Engineering Analysis MenuPolar Area Moment of Inertia and Section Modulus. The polar moment of inertia, J, of a cross-section with respect to a polar axis, that is, an axis at right angles to the plane of the cross-section, is defined as the moment of inertia of the cross-section with respect to the point of intersection of the axis and the plane. The polar moment of inertia may be found by taking the sum of the moments of inertia about two perpendicular axes lying in the plane of the cross-section and passing through this point. The polar section modulus (also called section modulus of torsion), Z Related: Polar Mass Moment of Inertia About Axis A-A, Axis B-B and Axis C-C.
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