고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.11

2.11 A nylon thread is to be subjected to a 2.5-lb tension. Knowing that \(E = 0.5 \times 10^6 \text{ psi}\), that the maximum allowable normal stress is \(6 \text{ ksi}\), and that the length of the thread must not increase by more than \(1\%\), determine the required diameter of the thread.