Question $6$

$[25$ Marks$]$

The beam section in Figure Q$6$ has constant $8$mm thickness and is subjected to bending moment of $M_x=180Nm$ applied about $x$ axis.

a$)$ Calculate $I_{},I_{yy}$ and $I_{xy}$

$[16$ Marks$]$

b$)$ Calculate the maximum direct stress due to bending, and state where $($which point$)$ it acts.

$[9$ Marks$]$