non-linear analysis

[lo85]

Hey, guys.
I wanted to ask a question about non-linear analysis.
how do I graphically understand from the convergence chart if the solution actually converges?
another thing,
I should make a curve of capacity, so as far as my structure does not collapse, thus representing the force applied until the final shift of collapse, but how do I impose this condition?
when I set my nonlinear isotropic material, I used a material:
nonlinear-inelastic-bilinear isotropic hardening with von mises criterion.
here I entered the yield point (i.e. I inserted the voltage that guarantees the passage from the elastic to platinum limit) and the tang g module.
I don't understand when my structure collapses though.
say that I should make a material with "multilinear isotropic hardening" so that even deformations related to the various tensions of the material are included?
I noticed that in the setting of the non-linear analysis a deformation of cut-off is required
I don't understand where I'm wrong.
Please help me.

 

[cdcmd]

hi look I do not have a great experience because I am at the first non-linear but I can tell you (for the first question) that to me, every time there is convergence a warning appears in the error log. i.e. a thing like that comes out:
"the unconverged solution (identified as ....) is output for analysis debug purposes. results should not be used for any other purpose"
so theoretically if you find such a warning you know it doesn't converge.

 

[cdcmd]

for the second thing, (I wanted to put everything in the same answer but I can't change the previous one), did you try to do before the non-linear an eigenvalue buckling?
gives you an overview of the instability behavior of your structure, although very theoretical, and I think you need to correctly set non-linear in a way.

 

[lo85]

Hi thanks for the answer, I think I've solved. .
When you do a non-linear analysis, the solution may not converge, but the previous steps may be good results.
I wanted to do some collapsing checks of my model, therefore, I can in theory stop even before the steps set in the non-linear analysis resulting in no final convergence of the solution.
in any case in the previous substeps the solution converges.
Thank you

 

[cdcmd]

thanks to you of the update, I am at the beginning and therefore I am useful every experience of others:smile: