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[FAQ]

If the base analysis is linear, the total perturbation load multiplied by the buckling load factor represents the ultimate buckling load. The prediction of the buckling load can be written: F_buckling = 0 + lamda * F_perturbed. If the base analysis is nonlinear, the ultimate buckling load is sum of the restart point load and the additional perturbation load: F_buckling = F_restart +lamda*F_perturbed. By default setting the “Keep Pre-Stress Load-Pattern” property to “Yes” retains the loading pattern from the Static Structural Analysis in the Eigenvalue Buckling analysis. Therefore, you will find load multiplier reducing by 1 when changing base analysis from linear to nonlinear.