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The tension in the bar $DC$ is given: $1$ kN. The tension in the bar $AC$ is also given: $-1.414$ kN. Neglecting gravitational forces, there is only one external force. Free-body diagram of the $DC$ ...
The equation for bending stress is $\sigma_b = \dfrac{My}{I}$ For a thin-walled circular shaft, $I = \dfrac{\pi d^3t}{8}$, $d = 2r$ (diameter) Rewrite the equation, with $y = d/2$: \$\sigma_b = \dfrac{...