고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.85

*2.85 Determine the dilatation \( e \) and the change in volume of the 8-in. length of the rod shown if (a) the rod is made of steel with \( E = 29 \times 10^6 \) psi and \( \nu = 0.30 \), (b) the rod is made of aluminum with \( E = 10.6 \times 10^6 \) psi and \( \nu = 0.35 \).