As with all simulations, the challenge is to interpret the results and decide if they provide a good estimation of the actual structure. Any finite element analysis (FEA) focusing on instability calculations should consider imperfections in the structure (residual stresses and geometrical imperfections), non-linear material behavior and the solver / FE package should be appropriate to make the calculations. The results should also be evaluated with regard to the buckling modes, and which simulated modes are plausible with regard to the actual structure.