Shear stress on a straight beam due to torque moment can be shown in the figure 1. This stress will has maximum value on the surface which is located at longest distance from twist axis.
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| Figure 1: Shear Stress due to Torque Moment |
Shear stress due to torque moment (σ) can be calculated using the following equation:
σ = T c / Ip
Where:
T = torque moment
c = distance element from center point
Ip = section polar of moment inertia
σ = shear stress due to torque moment