First model has elasto-plastic behavioiur, second has only elastic. Elastic goes through, but elasto-plastic does not. What is wrong?
One point (here: 418 — 0) is enough to define perfect plasticity. But it’s better to add some hardening to avoid convergence issues. You should make sure that the load is properly applied and of reasonable magnitude for this model.
Thanks. I updated material, but that was not a problem. Somehow compression only causes this. With “fixed” bc this goes through, but “compression only” affects an error (in elasto-plastc calculation, elastic is ok). Everything else are equal between models.
For the higher von Mises stress please see the: Load variation in non-linear material problem - #13 by mkraska
If possible, apply the compression only support to the area that will be compressed.
Do you have Nlgeom enabled ? It should be on when using the compression only constraint. Can you share the file ?
This is usually due to extrapolation with too coarse mesh: Higer stress from results than in elasto-plastic curve
Stress level is now ok. But compression only does not work even I enabled Nlgeom. Now elastic calculation neither does not go through.
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The simplest way is to reduce the default spring stiffness (1e12 N/mm). I tested your model with a coarser mesh, if you reduce the spring stiffness to 1e7 or less, it converges.
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Thanks. Now this converges.
