Torsion of a solid shaft

Set the torque, diameter and length to see the polar moment of area, shear stress and twist.

Works in metric or imperial units.

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Questions students ask

Why are hollow shafts used?

Most of the stress is carried near the outside, so removing the core saves weight with little loss of strength.

What formula does it use?

T/J = τ/r = Gθ/L; J = πd⁴/32.

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