The figure shows a vertical tube with a rigid support at its base. The tube consists of an outer shell marked 1 and a core marked 2. The load on the top surface of the tube is P which equals 30 kilo newtons directed vertically downwards.

As would be expected, the normal stress in each component is negative, indicating compression stress.

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

  Finished