A rod AB is made of brass (E=105 GPa; a=20.9 x 10-6/°C) and rod CD of aluminum (E=70 GPa; a=23.6 x 10-6/°C). Knowing that at a temperature of 15 °C gap exists between the ends of the two rods. Determine (a) the normal stress in each rod after the temperature of the whole assembly is then raised to 85 °C; (B) the deformation of rod AB at that time. 0.5 mm -300 mm -250 mm Brass Aluminum А в с D 50-mm diameter 75-mm diameter