고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.128

2.128 The specimen shown is made from a 1-in.-diameter cylindrical steel rod with two 1.5-in.-outer-diameter sleeves bonded to the rod as shown. Knowing that \( E = 29 \times 10^6 \) psi, determine (a) the load \( P \) so that the total deformation is 0.002 in., (b) the corresponding deformation of the central portion \( BC \).