879049.fig.009a
(a)
879049.fig.009b
(b)
Figure 9: (a) Deformed geometry and maximal principal stress range +7.5–−13.9 MPa. Minimal principal stress range 3.9–−33.4. Total deformation is at about radius and is 72.4 mm with pressure  MPa. (b) Internal web stiffeners and FEM boundary conditions.