The polar moment of inertia is wholly dependent on the cross-sectional area of the twisting object, and not a result of material type. Note that torque is a twisting force, and torsion is the twist that arises from the applied torque. In essence, polar moment of inertia is an object’s (whether that be in the form of a beam, tube, or shaft) resistance to deformation (plastic or not) due to an applied torque. As an example, if you had a tube that was being twisted, the cross-sectional area needed for the calculation would be the area of the circular cross-section of the tube. The twisting of an object will happen around the axis from where to calculate the polar moment of inertia. How Do You Calculate the Polar Moment of Inertia? What is Polar Moment of Inertia vs Product of Inertia?. The Difference Between Moment of Inertia and Polar Moment of Inertia.Rectangular Cross Section Polar Moment of Inertia.
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