Why does load multiplier reduce by 1 in eigenvalue buckling when I turn on large deflection in the base structural analysis?
March 17, 2023 at 9:00 amFAQParticipant
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.
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