non linear elastic

Hey,

I tried to do to NL elastic Simulation. (followed the steps from the video https://altairuniversity.com/analysis/structural/nonlinear/nlstat-tutorial-pressure-load-on-a-chair/)

but I don't get convergence.

The model works actually with elastic material law. So I don't know what I have to change.

Can someone have a look, please?)

 

Furthermore, I just have the 'yield strength', 'ultimate strength' and 'elongation at break'. so actually it would be enough to put a bilinear material law. is that somehow possible or is there just the way with the table?