Nastran reference manual : Buckling

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Data → Analysis Design → Bucking

The buckling section is designed to set the features of a buckling analysis.

Buckling analysis can be performed in two different ways:

          - Linear buckling analysis : This type of analysis will compute          desired modes of buckling of the model.

To perform this analysis, it is necessary to set values for the modes extraction process:

                   -Eigenvalue range of interest: Selects range of interest for                 buckling modes.

                   -Number of desired roots: Number of desired modes.

-Strum sequence: If this option is selected, the analysis will take a longer time, but the numerical solution will be more accurate.

- Nonlinear buckling analysis: Nonlinear buckling analysis is similar to the linear one except that a nonlinear solution is used     to form the tangent stiffness matrix. To perform this analysis it is     necessary to check nonlinear buckling option in the bottom of the        window and to define all necessary parameters in the nonlinear section .