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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › Buckling modes shapes › Reply To: Buckling modes shapes

May 18, 2020 at 10:03 pm
peteroznewman
Subscriber

 AJ998, you will get better suggestions if you provide images so we can see what you are doing.


What I suggested was to apply a very small perturbation load in step 1, which should not create highly distorted elements or negative Jacobians. If you got that, your load is way too high.  Use a tiny load that only moves the structure by a small fraction of a wall thickness.


In step 2, you ramp up the main buckling load, while ramping off the small perturbation load. This is when you can get highly distorted elements and negative Jacobians. What is important is to have a large number of substeps and plot the force up to the point when the distorted elements stops the solution.  It might not matter that the solution stopped if you got a good plot of the force.