고체역학 (Beer) — Pure Bending: Problem 4.6

4.6 A beam of the cross section shown is extruded from an aluminum alloy for which \(\sigma_Y = 250 \text{ MPa}\) and \(\sigma_U = 450 \text{ MPa}\). Using a factor of safety of 3.00, determine the largest couple that can be applied to the beam when it is bent about the \(z\) axis.