25 mm 60 mm Brass core E=105 GPa a = 20.9 × 10-6°C Aluminum shell E = 70 GPa a = 23.6 X 10-6/°C PROBLEM 2.47 The aluminum shell is fully bonded to the brass core and the assembly is unstressed at a temperature of 15°C. Considering only axial deformations, determine the stress in the aluminum when the temperature reaches 195°C.​