$(7)$ A cooper bar with a rectangular cross section is held without stress between rigid supports $($see

Figure $7).$ Subsequently, the temperature of the bar is raised $50C.$ Determine the stresses on all

faces of the elements A and $B,$ and show these stresses on sketches of the elements. $($Assume

thermal expansion coefficient $=17\mathrm{.}5\frac{{10}^{-6}}{}C$ and $E=120$GPa. Note that the axial

$($compressive$)$ stress $$ due to the temperature change $({}_T)$ can be calculated as $=$

$E$ T$).$

$(7)$ A cooper bar with a rectangular cross section is held without stress between nigla supports $($see

Figure $7).$ Subsequently, the temperature of the bar is raised $50C.$ Determine the stresses on all

faces of the elements A and $B,$ and show these stresses on sketches of the elements. $($Assume

thermal expansion coefficient $=17\mathrm{.}5\frac{{10}^{-6}}{}C$ and $E=120$GPa. Note that the axial

$($compressive$)$ stress $$ due to the temperature change $({}_T)$ can be calculated as $=$

Exax ${}_T).$