Two solid cylindrical rods AB and BC are welded together at B and loaded as shown. Knowingthat the average normal stress must not exceed $150$ MPa in either rod, determine thesmallest allowable values of the diameters d$1$ and d$2.$ Take P $=50$ kN$.$

Two solid cylindrical rods $AB$ and $BC$ are welded together at $B$ and loaded as shown. Knowing

that the average normal stress must not exceed $150$ MPa in either rod, determine the

smallest allowable values of th$,$ diameters $d_1$ and $d_2.$ Take $P=50kN.$ Answer: $d_1=20\mathrm{.}6mm.$