고체역학 (Beer) — Pure Bending: Problem 4.132

4.127 through 4.134 The couple M is applied to a beam of the cross section shown in a plane forming an angle \(\beta\) with the vertical. Determine the stress at (a) point A, (b) point B, (c) point D. For Fig. P4.132: \(M = 75 \text{ kip}\cdot\text{in.}\) \(\beta = 75^\circ\) The cross-section is a rectangular box with outer width \(4.8 \text{ in.}\) and total height \(4.0 \text{ in.}\) (from the labels \(2.4 \text{ in.}\) and \(1.6 \text{ in.}\)). An internal width of \(4 \text{ in.}\) is shown. The centroid \(C\) is located \(2.4 \text{ in.}\) from the top and \(1.6 \text{ in.}\) from the bottom.