고체역학 (Gere) — Axially Loaded Members: Problem 2.4-11

2.4-11 Three steel cables jointly support a load of 60 kN (see figure). The diameter of the middle cable is 20 mm and the diameter of each outer cable is 12 mm. The tensions in the cables are adjusted so that each cable carries one-third of the load (i.e., 20 kN). Later, the load is increased by 40 kN to a total load of 100 kN. (a) What percent of the total load is now carried by the middle cable? (b) What are the stresses \(\sigma_M\) and \(\sigma_O\) in the middle and outer cables, respectively? Note: See Table 2-1 in Section 2.2 for properties of cables.