4. a) A 20 mm diameter copper rod is surrounded tightly by a 40 mm diameter cast-iron tube, and the ends are securely fa

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4 A A 20 Mm Diameter Copper Rod Is Surrounded Tightly By A 40 Mm Diameter Cast Iron Tube And The Ends Are Securely Fa 1 (88.13 KiB) Viewed 48 times

4. a) A 20 mm diameter copper rod is surrounded tightly by a 40 mm diameter cast-iron tube, and the ends are securely fastened together. How much load will be shared by the copper rod and cast-iron tube when the compound bar is subjected to a compressive load of 15 kN? Also, determine how much the compound bar shortens if it is 3m long. Take Ecopper 75 GPa and Ecast-iron = 175 GPa. b) A composite bar is fixed between two supports (Figure 6). If the temperature of the bar is raised from 15°C to 85°C, find the stresses induced in each rod by assuming (a) if the supports don't yield and (b) if the support yield by 0.15 mm. Take E₁ = 210 kN/mm², E2 = 35kN/mm², E3 = 120 kN/mm², a₁ = 1.3 x 10-5/°C, a₂ = 1.8 x 10-5/°C, a3 = 1.7 x 10-5/°C. $= 40 mm _Q.. 250 mm - 80 mm 350 mm Figure 6 120 mm 550 mm