Note: $($Please Answer Parts i$,$ ii$,$ and iii$)$

Questions: The cold$-$drawn AISI $1040$ machined steel bar shown in the figure is subjected to a completely reversed axial load fluctuating between $7kN$ in compression to $7kN$ in tension.

i$)$ Estimate the factor of safety based on achieving infinite life

ii$)$ Determine the factor or safety in the absence of the hole

iii$)$ Briefly describe in point form other factors that should be checked before approval of this bar