For the following two homogeneous sections,

$($a$)$ find the positions of the plastic neutral axis and

$($b$)$ find the plastic moment capacity.

$($c$)$ find the plastic section modulus.

All dimensions in mm $.$ The yield stress of the material is $350($N$)/($m$)$m$^(2).$

Answers: $($i$)$ Mp$=340$kNm$,$S$=971250$mm$^(3)$;

$($ii$)$ Mp$=126$MNm$,$S$=361\mathrm{.}2\backslash$times $10^(6)$mm$^(3)$;