The free radial boundary conditions are applied at each end cross-section in the model:

Figure 62.4: Boundary Conditions on the Abdominal Aorta Model

Local cylindrical coordinate systems are created at each end cross-section. The nodes in each end cross-section are constrained in all degrees of freedom except for the respective local radial direction.

A uniformly-distributed pressure load is applied on the inner surfaces of the model.

Figure 62.5: Loading on the Abdominal Aorta Model

Because the input geometry is considered at end-diastolic pressure, a pressure load of 80 mm Hg (1.0666e-02 MPa) is applied on the inner surfaces of the model in the first load step (inverse-solving). The pressure is increased to 120 mm Hg (1.5999e-02 MPa) in the second load step (forward-solving).