고체역학 (Beer) — Pure Bending: Problem 4.94

4.94 A solid bar of rectangular cross section is made of a material that is assumed to be elastoplastic. Denoting by \(M_Y\) and \(\rho_Y\), respectively, the bending moment and radius of curvature at the onset of yield, determine (a) the radius of curvature when a couple of moment \(M = 1.25 M_Y\) is applied to the bar, (b) the radius of curvature after the couple is removed. Check the results obtained by using the relation derived in Prob. 4.93.