When do stresses occur in a body made of a single material due to uniform temperature ch...

When do stresses occur in a body made of a single material due to uniform temperature change in the body? Consider Problem 15.1 and also compare the solution to Example 15.1 in this chapter.

Reference Problem 15.1

For the one-dimensional steel bar fixed at the left end, free at the right end, and subjected to a uniform temperature rise T = 50 ° F as shown in Figure P15–1, determine the free-end displacement, the displacement 60 in. from the fixed end, the reactions at the fixed end, and the axial stress. Let E = 30 × 10⁶ psi, A = 4 in², and α = 7:0 × 10^–6 (in./in.)/ ° F.