고체역학 (Beer) — Pure Bending: Problem 4.164

4.164 For the machine component and loading shown, determine the stress at points A and B when \( h = 2.5 \text{ in.} \) (From Figure P4.163 and P4.164: Applied couples \( M = 4 \text{ kip}\cdot\text{in.} \), section width \( b = 0.75 \text{ in.} \), and outer radius \( r_2 = 3 \text{ in.} \))