5 mm 5 mm 20 mm 20 mm 5 mm Problem 1 The brass (ab 20.9 x 10-6 /°C) shell of 5 mm wall thickness is fully bonded over the length of 250 mm to the steel (as 11.7 x 10-6 /°C) core of a cross- section of 20x20 mm². Determine the largest allowable increase in temperature if the stress in the steel core is not to exceed 55 MPa. 5 mm Steel core E=200 GPa Brass shell E = 105 GPa 250 mm