FEM - Stability Analysis

Project Support
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For a non-linear analysis you will need to make the following changes to your current half model linear project:

  1. Change to a nonlinear simulation type with
    Simulation > Properties > Nonlinear analysis > True
  2. Enable geometric nonlinear behavior with
    Model > Geometric behavior > nonlinear
  3. Enable nonlinear material behaviour with
    Model > Materials > Steel > Material behavior > Plastic
  4. Add a table to define the materials stress-stain curve after yield. You can find examples here
  5. Add a time dependent load e.g. 10000*t
    Model > Boundary Conditions > Loads
  6. Enable line search to give the solver a better chance to find a solution in the post buckling region.
    Numerical > Line Search > True

I may have forgotten a few steps but that’s probably enough to get you started.

Give it a go. If you have any trouble please let me know and I will see if I can help.

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