Performing a nonlinear buckling analysis

A nonlinear buckling analysis is a multistep workflow. In general, you must:

1. Create a new Solution with the Analysis Type set to Structural and the Solution Type set to Nonlinear Buckling Analysis.

2. Create the linear buckling step.Right-click the solution in the Simulation Navigator and select New Step.In the Solution Step dialog box, select the Step–Linear Buckling from the Solution Step list.Use the other options in the Solution Step dialog box to specify additional options for the linear buckling step, such as the number of modes to extract.

3. Create the nonlinear buckling step.Right-click the solution in the Simulation Navigator and select New Step.In the Solution Step dialog box, select the Step–Nonlinear Buckling from the Solution Step list.Use the other options in the Solution Step dialog box to specify additional options for the nonlinear buckling step, such as the maximum number of substeps.

4. Solve the solution.

5. Review your results to look for the initiation of buckling. You can:Examine the convergence table of results and decide which substep to use for the post-buckling analysis (the step where divergence occurs). To view the convergence table: Right-click the solution in the Simulation Navigator and select Edit.In the Solution dialog box, click Preview Ansys monitor file.In the Post Processing Navigator, display and examine the displacements. Try to determine whether the results show buckling initiation or simply a fault instability.

6. If you determine that buckling initiation occurred during the nonlinear buckling step, create the post-buckling step.Right-click the solution in the Simulation Navigator and select New Step.In the Solution Step dialog box, select the Step–Post–Buckling from the Solution Step list.Use the Multiframe Restart option to specify the substep in the nonlinear buckling step where the buckling initiatedUse the Substep Definitions option to specify the number of substeps to perform.Use the Nonlinear Stabilization options to select the appropriate method for solution stabilization.

7. Solve the post-buckling step.

Look up more details

Transient dynamic analysis

Thermal-structural multiphysics analysis

Nonlinear buckling analysis

Harmonic analysis

Cyclic symmetry analysis in ANSYS

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Performing a nonlinear buckling analysis, Simcenter 3D 2021.1 Series

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