Trying to conduct stress analysis of a bolt connector in simulation, get this message
The Iterative Solver stopped.
The solver has numerical difficulties.
Model may not have adequate fixtures.
No results saved.
Any help is appreciated
This is a common question that comes up a lot on this forum. The model is definitely unstable but tracking down how it is unstable is the real problem. You will be able to track down the instability by going through this process on your own study:
1. Go into the study 'Properties'
Turn on 'Use soft springs to stabilize model'
Turn off 'Compute free body forces'
Turn off 'Large displacement mode'
Set the solver to 'Automatic'
2. Suppress all loads and apply only 'Gravity'
3. Mesh/Run the study
4. When the solver stops (if it stops) due to large displacements and prompts to put the study into 'Large Displacement mode' declined this offer. The solver will dump what results it has so far
5. Inspect the displacement plot in the results to find the unrestrained body
For any body that is unconstrained you would need to create explicit 'Contact Sets' in order to bond these unrestrained bodies to the rest of your structure.
This video (GoEngineer - Simulation: Common Errors in Simulation Webinar) and this document (GoEngineer - Simulation: Diagnose Unstable Studies) give more detail study instability.
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