고체역학 (Gere) — Axially Loaded Members: Problem 2.3-20

2.3-20 Repeat Problem 2.3-18, but assume that the bar is made of aluminum alloy. If \( P_2 = 200 \text{ kN} \), what is \( P_1 \) so that displacement \( \delta_C = 0 \)? What is displacement \( \delta_B \)? Assume that \( L = 2 \text{ m} \), \( t = 20 \text{ mm} \), \( b_1 = 100 \text{ mm} \), \( b_2 = 115 \text{ mm} \), and \( E = 72 \text{ GPa} \).