(Solved): (i) (18 markspi, A stainless-steel bar and an aluminium bar are held between two rigid supports ...

(i) (18 markspi, A stainless-steel bar and an aluminium bar are held between two rigid supports as shown in figure 1a. The temperature is raised by $$160^{?}\mathrm{C}$$. a) Determine the normal stress in the aluminium bar. b) Determine the elongation of the stainless-steel bar. Figure 1a For the Aluminium bar: Cross-sectional area $$=1600{\mathrm{mm}}^2$$ $$\mathrm{E}=75\mathrm{GPa}$$ Coefficient of thermal expansion $$(?)=23\times 10^{?6}{\left({}^0\mathrm{C}\right)}^{?1}$$ For the Stainless-steel bar: Cross-sectional area $$=600{\mathrm{mm}}^2$$ $$\mathrm{E}=190\mathrm{GPa}$$ Coefficient of thermal expansion $$(?)=17.3\times 10^{?6}{\left({}^0\mathrm{C}\right)}^{?1}$$