Please state your assumptions and show all your work clearly.

$1.[100$ marks$]$ Hot$-$rolled part made of $1030$ steel, its surface not modified $($or machined$)$ as presented in the following geometry and loading conditions. $\backslash \%95$ reliability is desired at operating temperature of $\backslash (700^\{\backslash$circ$\}\backslash$mathrm$\{$F$\}\backslash ).($Note both loads act in the same direction$)$

Find the factor of safety against fatigue for infinite life.