(Solved): The assembly shown consists of an aluminum shell \( \left(E_{a}=70 \mathrm{GPa}, a_{a}=23.6 \times ...

The assembly shown consists of an aluminum shell \( \left(E_{a}=70 \mathrm{GPa}, a_{a}=23.6 \times 10^{-6} P \mathrm{C}\right) \) fully bonded to a steel core \( \left(E_{S}=200 \mathrm{GPa}\right. \), \( a_{5}= \) \( 11.7 \times 10^{-6} \mathrm{p} \mathrm{C} \) ) and the assembly is unstressed at a iemperature of \( 20^{\circ} \mathrm{C} \). Considering only axial deformations, determine the stress in the aluminum when the temperature reaches \( 180^{\circ} \mathrm{C} \). The stress in the aluminum is MPa.