The center rod CD of the assembly is heated from T1 = 30°C to T2 = 180°C using electrical resistance heating. At the lower temperature T, the gap between C and the rigid bar is 0.7 mm. Determine the force in rods AB and EFcaused by the increase in temperature. Rods AB and EF are made of steel, and each has a cross-sectional area of 125 mm2. CD is made of aluminum and has a cross-sectional area of 375 mm2. Est = 200GPa, Eal = 70GPa, and αst = 23( 10-6)/°C.
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