Unable to Run Plastic Analysis this simple model

Aftab

Hi There
Since upgrade to 25th Version. Unable to run this simple (only orthogonal plates) model for plastic analysis. Could someone check what i am doing wrong.

Aftab

file attached.

Victor

It didn't finish solving in either 24 or 25 for me. It's possible you have a different version or build of CCX used by 24. 25 would have defaulted to the built-in one when it was installed.

JohnM

I tried running without plastic properties, still does not complete. I would check your set up with a linear run before you add plasticity. Also, bilinear curves are usually 1/10th the elastic modulus in the plastic region ~ 21MPa for your steel. You are currently using 1MPa - this is too soft and also difficult to converge.

Victor

It solved with the dent in the larger plate flattened out (set to y=0). I wonder if there's buckling happening around there leading to poor/no convergence. Is this something you're expecting or want to capture?

With the dent in place, it solved a little bit (0.00099 s) with very small loads (0.001 s initial time step and t^2 load scaling factors). Perhaps that's about the critical load?

Aftab

Many thanks Victor for your runs. I was getting first conversion and then nothing which suggests buckling at that small load as you got. I was expecting buckling may be not that earlier, however, there seems to be an issue with the plate. Many Thanks much appreciated.