A flat steel bar of 20 mm × 10 mm is fixed with aluminium flat of 20 mm × 10 mm so as to make a square section of 20 mm × 20 mm. The two bars are fastened together at their ends at a temperature of 26°C.Now the temperature of whole assembly is raised to 55°C. Find the stress in each bar.
Es = 200 GPa, Ea = 70 GPa, αs = 11.6 × 10−6 /°C, αa = 23.2 × 10−6/°C.
