The center rod CD of the assembly is heated from T1 = 30°C to T2 = 180° C using electrical...

The center rod CD of the assembly is heated from T1 = 30°C to T2 = 180° C using electrical resistance heating. Also, the two end rods AB and EF are heated from Ti = 30°C to T2 = 50°C. At the lower temperature T1 the gap between C and the rigid bar is 0.7 mm. Determine the force in rods AB and EF caused by the increase in temperature. Rods AS and EE 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, Ea = 70 GPa, αst =12( 10-6)/°C and αal = 23( 10-6)/°C.