Learning Forum

[Nanda Veralla]

Hello Sushant,

Given that the “Adjust to touch” setting did not work in your case, and considering the already good enough mesh quality you have, here are a few suggestions for step 2:

1. Penetration Tolerance Adjustment: Increase the penetration tolerance in the bonded contact settings. This might help in accommodating the slight gaps or penetrations that are causing the convergence issues. You can manually set the penetration tolerance to a value slightly higher than your gap (40-50 microns). 9.6.3.3. Advanced Settings (ansys.com)

2. Pinball Region: Ensure that the pinball region radius is adequately large to cover the gaps. (link 9.6.3.3 has details of pinball too)

3. Switch Contact Formulation: If the current contact formulation is “Program Controlled”, try switching it to “Augmented Lagrange” or “Pure Penalty”. These formulations can sometimes handle initial gaps better by allowing some penetration without causing convergence issues. 9.6.2. Contact Formulation Theory (ansys.com)

4. Alternative Contact Type: Use this as a last resort, If bonded contact continues to cause issues, consider using a “No Separation” contact instead of bonded. This will allow the surfaces to come into contact without relative motion but might handle initial gaps better. 9.6.5. Setting Contact Conditions Manually (ansys.com)

 

Try implementing these suggestions and see if they resolve the convergence issues. You might need to experiment with a combination of these settings to find the best solution for your specific case. Please, let us know if the above suggestions didn’t work out.

Best,
Nanda