6.5 TORSION OF HOLLOW CIRCULAR SHAFT
Let a hollow circular shaft subjected to a torque T be considered (Figure 6.3). An elemental ring of area dA is considered. Then
Fig. 6.3 Hollow circular shaft.
Let Re and Ri be the external and internal radius and De and Di be the external and internal diameter of the hollow shaft, respectively.
From Equation (6.7), the shear stress at the radius r is
Shear force dF as the elemental ring
Now the torque, dT, due to this shear force as the elemental ring
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