고체역학 (Beer) — Introduction—Concept of Stress: Problem 1.3

1.3 Two solid cylindrical rods AB and BC are welded together at B and loaded as shown. Knowing that P = 10 kips, find the average normal stress at the midsection of (a) rod AB, (b) rod BC. Given data from Figure P1.3: - Rod AB: diameter \(d_{AB} = 1.25 \text{ in.}\), length \(L_{AB} = 30 \text{ in.}\) - Rod BC: diameter \(d_{BC} = 0.75 \text{ in.}\), length \(L_{BC} = 25 \text{ in.}\) - Load at B: \(12 \text{ kips}\) (downward) - Load at C: \(P = 10 \text{ kips}\) (downward)