Question One

$[20$ Marks$]$

The composite bar in Figure Q $1$ is stress$-$free before the axial loads $P_1$ and $P_2$ are applied. Calculate the stress in each material if $P_1=150kN$ and $P_2=90kN,$ given that:

a$)$ Both walls are rigid.

b$)$ The right wall yields by $0\mathrm{.}8$ mm $.$

$[10$ Marks$]$

$[10$ Marks$]$