A material $($sted$)$ in the hotrolled

conditim tests ${}_{m{l}_s}=120ki$ and ${}_{ys}=90$kmi.

A solid circular rod will be made ont of

this material. It will be mujected to

furctuating temile load of $18$ kits to

$22$ kits. Consider $K_f=1\mathrm{.}2$ and $N=1\mathrm{.}75.$

Determine the minium diameler of

the rod ${}_e\frac{1}{2}{}_{\text{u}\text{t}\text{s}}$