Considering different types of circular bars as shown in Figures $1,2,3$ and $4$ respectively, thebars are subjected to the load of P $=15$kN$.$ It is noted that L$1=350$mm$,$ L$2=200$mm$,$ D$1=60$mm$,$ D$2=40$mm$.$ The bars are made of mild steel, and the Young's modulus is given by$190$GPa and the Poisson's ratio is of $0\mathrm{.}32.$ In this exercise, you are expected to look into stress$/$displacement distribution generated by Finite Element Analysis and compare the answer with your calculation.