Find the temperature stresses when the expansion of the rod is fully prevented.

$\text { Take, } \alpha=12 \times 10^{-6} \text { per }^{0} \mathrm{C} . \quad \mathrm{E}=2 \times 10^{5} \mathrm{N} / \mathrm{mm}^{2}$ $$ \begin{array}{l}{\text { Data: } L=15 m \quad t_{1}=15^{\circ} C t_{2}=65^{\circ} \mathrm{C} \quad \alpha=12 \times 10^{-6} /^{\circ} \mathrm{C}} \ {E=2 \times 10^{5} \mathrm{N} / \mathrm{mm}^{2}} \ {\text { Find: } …