Engineers Corner: Torsion Deformation and Stress Equations – Hollow Tube Sections

To calculate the shear stress, τ and angular deflection, θ caused by a torsional moment generated by the application of forces acting at some distance from the centroid, the polar moment of inertia for the respective section, Ϳ is required.

Figure 1: Typical Tubular Sections

For a Hollow Circular Tube:

For a Hollow Square Tube:

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