Problem with mesh convergence analysis. Why I get "Too many attempts made for this increment&qu

[Hossein Mohammadi H]

I am simulating the separation of two surfaces connected with cohesive surface interaction in a 2D static problem in ABAQUS. Although using a coarse mesh everything seems ok, when I use a finer mesh to check mesh convergence I get this error: "Too many attempts made for this increment".
As I am using hyperelastic material in my model "Nlgeom" is On. I checked for an elastic material with Nlgeom off I could get output results with a fine mesh without any error. So it seems I have some problems here. Attached is an image of the warnings I get in this simulation. Can anyone help? Thanks in advance.

 

[FEA way]

That's a common nonconvergence error. In this case it may be caused by instability. Try enabling automatic stabilization in step settings.

 

[Hossein Mohammadi H]

I already used Automatic Type in step settings. Should I play with the number and size of incrementations or sth else to resolve the problem?

 

[FEA way]

Aren’t you talking about automatic type of incrementation (Incrementation tab) ? Because what I mean is automatic stabilization (Basic tab). Default setting is "None" but if you choose "Specify dissipated energy fraction" or "Specify damping factor" then the solution’s convergence may improve.

It’s also important to take a look at the last frame of results saved before the analysis stopped. This way you may find out what caused the problem.

 

[Hossein Mohammadi H]

Yes, automatic stabilization was helpful. Thank you so much for your help.