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 (291.56 KiB) Viewed 78 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 15kN ? Also, determine how much the compound bar shortens if it is 3 m long. Take Ecopper ​=75GPa and Ecast-iron ​=175GPa. 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​=210kN/mm2,E2​=35kN/mm2,E3​ =120kN/mm2,α1​=1.3×10−5/∘C,α2​=1.8×10−5/∘C,α3​=1.7× 10−5/∘ Figure 6