고체역학 (Beer) — Pure Bending: Problem 4.43

4.39 A copper strip (\(E_c = 105 \text{ GPa}\)) and an aluminum strip (\(E_a = 75 \text{ GPa}\)) are bonded together to form the composite beam shown. Knowing that the beam is bent about a horizontal axis by a couple of moment \(M = 35 \text{ N}\cdot\text{m}\), determine the maximum stress in (a) the aluminum strip, (b) the copper strip. 4.43 For the composite beam in Prob. 4.39, determine the radius of curvature caused by the couple of moment \(35 \text{ N}\cdot\text{m}\).