Polar Moment of Inertia in Strength of Materials Formulas

The Polar moment of Inertia is a shaft or beam’s resistance to being distorted by torsion, as a function of its shape. And is denoted by J. Polar Moment of Inertia is usually measured using the Meter⁴ for Second Moment of Area. Note that the value of Polar Moment of Inertia is always negative.

Formulas to find Polar Moment of Inertia in Strength of Materials

fxMoment of Inertia for Hollow Circular ShaftGo

fxMoment of Inertia about Polar AxisGo

List of variables in Strength of Materials formulas

fx Outer Diameter of Hollow Circular Section Go

fx Inner Diameter of Hollow Circular Section Go

fx Diameter of Shaft Go

FAQ

What is the Polar Moment of Inertia?

The Polar moment of Inertia is a shaft or beam’s resistance to being distorted by torsion, as a function of its shape. Polar Moment of Inertia is usually measured using the Meter⁴ for Second Moment of Area. Note that the value of Polar Moment of Inertia is always negative.

Can the Polar Moment of Inertia be negative?

Yes, the Polar Moment of Inertia, measured in Second Moment of Area can be negative.

What unit is used to measure Polar Moment of Inertia?

Polar Moment of Inertia is usually measured using the Meter⁴[m⁴] for Second Moment of Area. Centimeter⁴[m⁴], Millimeter⁴[m⁴] are the few other units in which Polar Moment of Inertia can be measured.

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