The figure shows the free body diagram of the tube near the free end B. The load on top of the tube is P which equals 30 kilo newtons directed vertically downwards. The reaction force on member 2 is F subscript 2 directed vertically downwards. The reaction force at the base of the tube is F subscript 1 directed vertically downwards.

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