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Extracted text: A composite bar consist of two materials aluminum and steel is rigidly attached to the fixed supports at (80 degree C) as shown in Figure. If the ends do not yield, find the stresses in the two materials of the bar when the temperature of the composite bar falls to (20 degree C). Es = 200 GPa, Ea = 70 GPa, as = %3D 11.7*10^-6 /C , aal = 23.4*10^-6 /C, %3D As= 275 mm^2, Aal = 450 mm^2. %3D AI STEEL + 500 mm- 900 mm 006 u