고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.119

*2.119 For the composite bar of Prob. 2.111, determine the residual stresses in the tempered-steel bars if P is gradually increased from zero to 98 kips and then decreased back to zero. (From Prob. 2.111: Two tempered-steel bars, each 3/16 in. thick, are bonded to a 1/2-in. mild steel bar. This composite bar is subjected as shown to a centric axial load of magnitude P. Both steels are elastoplastic with \(E = 29 \times 10^6 \text{ psi}\) and with yield strengths equal to 100 ksi and 50 ksi, respectively, for the tempered and mild steel. The width of the bar is 2.0 in.)