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The two cylindrical rod segments are fixed to the rigid walls such that there is a gap of 0.01 in. between them when T1 = 60°F. What larger temperature T2 is required in order to just close the gap? Each rod has a diameter of 1.25 in. Determine the average normal stress in each rod if T2 = 300°F. Take αal =13(10-6)/°F, Eal =10(103) ksi, (σγ)al =40 ksi, α cu =9.4(10-6)/°F, Ecu = 15(103) ksi, and (σγ)cu=50 ksi.
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