Non-Linear Simulation fatal error issue

[Harishkulkarni]

I am using Creo Simulate Release 7.0 and Datecode7.0.0.0

We are facing issues for non-Linear cases for structural Simulation for Mechanical Bus Bar Part. During simulation for initial mesh of flexible limit size of 5mm, its working properly, when we keep for simulation run with constraint the Nonlinear iteration is not Converging. we tried multiple ways of applying Boundary conditions. we are getting error every time. Simulation convergence plot is running fine 2 passes, after we get error message as " Run completed with Fatal error". we also try to change number of steps with minimum and maximum steps. in both cases we unable find results and getting same error message. Please assist us for solving the above issue.

Here are the errors that I faced
"The Non-linear iteration did not converge".
" Run completed with Fatal error."

[rrabe]

Hi,

Unfortunately your description would be not enough to narrow the possible problems.  Non convergence in LDA can have several reasons, Meshing, material definition, step sizes or even garbage being wrongly included in the model (like corrupted deleted/suppressing features or load/constrains.

Without more details - or the model - it may be hard to get a feedback.

Sometimes for NDA reasons you are not allowed to forward the model - but you can create a dummy (and simply) CAD model that is a copy of of your FEM setup. This will also help you to find if the problem is specifically model related or if it is how you are defining it in Simulate.     

[hadardor · Accepted solution]

Hello,

It might be due to :

• Very Marge loads
• Presence of Model Snapthrough
• The deofmration is very lmarge so that it requires a mesh refine
• Model may have buckling mode with load factor smaller than this value.

Suggestions to be tested one by one:  

• Run analysis with small steps (11) with max 0.05 load
• Set engine environment variables MSE_EITHER_CONVERGE true and MSE_NL_substep true
• Set config.pro option sim_nl_ldc yes  to output load deflection file.