Figure 7. Effect of variable wall thickness on wall stress distributions.

(A) Axisymmetric model with longitudinally-varying wall thickness. (B) Plane strain model with circumferentially-varying wall thickness. In all cases, an internal pressure of 0.016 N/mm² (120 mmHg) was applied. For both geometries considered, effective wall stresses (in units of N/mm²) are shown as computed using reference, conventional and linear models (left). Differences in the effective wall stress with respect to reference wall stresses for the linear and conventional approaches are also shown (right).