Error Help
Error Help
(OP)
Hi Guys,
I'm new to Abaqus and I was hoping someone could help me out with the following error that I keep getting;
"Too many attempts made for this increment"
Lowering the Minimum Increment size doesn't have any effect. I can't think of anything else.
Any help would be appreciated.
Thanks
I'm new to Abaqus and I was hoping someone could help me out with the following error that I keep getting;
"Too many attempts made for this increment"
Lowering the Minimum Increment size doesn't have any effect. I can't think of anything else.
Any help would be appreciated.
Thanks





RE: Error Help
Rob Stupplebeen
RE: Error Help
I tried lowering the max increment, but still get the same error. I am trying to run a sphere-plate contact (surface-to-surface contact) model. Both parts are 3d deformable shells (i tried solids at first but wasn't getting good results) with specified thickness and material properties. I have applied a rigid body constraint to the plate which is fixed. The sphere has a negative vertical displacement to simulate penetration. I wanted to compare Abaqus results with theoretical so I can check if my model was right
RE: Error Help
Are you doing dynamic analysis in ABAQUS?
You can look at the *CONTROLS or the *CONTACT CONTROLS options in the Abaqus Keywords Reference Manual.
The *CONTACT CONTROLS option provides additional optional solution controls for models involving contact between bodies. Be very very careful with the parameters you are going to alter.
Be aware that the *CONTACT CONTROLS option must be used in conjunction with the the *CONTACT PAIR option in Abaqus/Explicit analyses.
The *CONTROLS option is more general and you can modify various parameters with this. The parameter ANALYSIS=DISCONTINUOUS would be a good initial option, but if it doesn't work, then you have to reset some convergence parameters in the *CONTROLS option.
I used ABAQUS for performing dynamic analyses in cases of earthquake-loaded soil layers, lying on rigid bedrock and I encountered serious problems, watching a notification "Too many attempts made for this increment" written in the .msg file. This can be corrected in the way I stated above, but I want to point that you must be careful because excessinely weak convergence criteria can impair the program's results so that they won't be reliable any more...
Best regards,
George Papazafeiropoulos
_______________________________________
First Lieutenant, Hellenic Air Force
Civil Engineer (M.Sc.), Ph.D. Candidate
RE: Error Help
I'm doing a static analysis.
Rob, how do I check for convergence??
Thanks
RE: Error Help
You should look at the information Abaqus provides in the .msg and .dat files. There is a lot of info there to help you find the specific cause of non-convergence. It can help you find mistakes in your model. Probably the most important indicator is whether there were any converged increments or not.
If the info in these two files does not help you can reduce the nonlinearity of the problem (temporarily) to help find the cause of the problem. For example, you can switch to frictionless contact, or even small sliding contact. If you have nonlinear materials, you can also convert them to linear elastic.
Nagi Elabbasi
www.veryst.com