고체역학 (Beer) — Pure Bending: Problem 4.45

4.45 For the composite beam in Prob. 4.41, determine the radius of curvature caused by the couple of moment 200 kip·in. (Prob. 4.41: The 6 × 10-in. timber beam has been strengthened by bolting to it the steel straps shown. The modulus of elasticity for wood is \(1.5 \times 10^6 \text{ psi}\) and for steel is \(29 \times 10^6 \text{ psi}\). Knowing that the beam is bent about a horizontal axis by a couple of moment \(M = 200 \text{ kip}\cdot\text{in.}\), determine the maximum stress in (a) the wood, (b) the steel.)