Problem $1$

The $3-$mm$-$thick brittle bar is loaded axially with a constant force $F$ of $15kN.D=40mm$ and $d=$

$36$ mm $.$ The radius of insert hole, notch and fillet are $2mm,3mm$ and $1$ mm $,$ respectively. Which

section is most dangerous $($the hole, notch or fillet$)?$

For the notch, you can find a graph to determine stress concentration factor in the Appendix table.