Having determined the internal forces, the normal stresses in aluminum tube (1) and brass core (2) can now be computed:
σ1=F1A1
=(-10.93 kN)(1000 N/kN)326.726 mm2 =-33.5 MPa
σ2=F2A2
=(-19.07 kN)(1000 N/kN)380.133 mm2 =-50.2 MPa