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A steel tie rod of diameter 20 mm is encased in a copper tube of external diameter 36mm and internal diameter 24 mm with the help of Washer’s and nuts. The nut on the tie rod is tightened so on to produce a tensile stress of 50 N/mm2 in steel rod. Now the combination is subjected to a temperature rise of 80°C. Determine the resultant stresses developed in the rod and the tube take 6 6 11 10 , 18 10 , 2 210 s s E E GPa a a C ? C ? = × – – = × = = °

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