Learning Forum

[saumitramj]

Hello everyone,

I have a doubt regarding force transfer and resulting stress calculations. I have setup the simulation as per below images (The geometry is a single part). In the results, the final deformation is more than the initial gap between the 2 surfaces. Yet I couldn't see any stress on the 2nd surface (In the 4th image the stress is in MPa). 1st surface is actually penetraring the 2nd but still there is no force transfer.

Is there any setting for that. Please help.

Please let me know if I need to provide more information.

Thank you!

[Erik Kostson]

Hi



For more info on contact and large gap search the forum and our course on contact analysis.

(Additional info which you can look into after reviewing the above courses:
First make sure that you have defined a contact between the two faces that will come into contact.
When you have that make sure the pinball region is large enough and as large (pinball radius) as the gap.
Use the contact tool to check the above (pinball and status of the contact).
Finally add many substeps in the analysis settings to properly capture the contact.
(Use also large deflections/deformations).)
Thank you

Erik

[saumitramj]

Hello Erik Thank you so much for the answer! I tried your suggestions to define a contact between the 2 surfaces. I did a simulation using each type to see which one suits my requirement. For rough, frictional and frictionless contact, it still does not transfer any force (pinball radius is more than the initial gap). For no separation and bonded contact, 1st surface moves with the 2nd right from the start (as per below image). Also, I want to apply a contant force on the surface but as per suggestion I tried applying it in 20 steps. Do I need to add more steps?

How do I define a condition where the force starts getting transferred right after the 1st surface touches the second surface due to deformation.
I look forward to your guidance.
Thank you.

[Erik Kostson]

Hi

As we said first go through the courses in contact as we suggested.

Once you have understood the contacts settings (for frictional or frictionless contact), then use these below settings for the frictional contact between upper and lower plate faces which seems to work (especially important is the contact/target shell face option on the shell faces - they need to point towards each other, and you might need to change these settings compared to below, but they should point towards each other as shown - see below - the other settings are program controlled).
Mesh is good to be structured if possible (use face meshing on the two faces coming in to contact with each other):
Finally
As for the solver settings:


With these considerations it should solve well.


(Ansys employees are not able to provide a model, see rules of these forum, but with the above considerations it should solve)
All the best

Erik

[saumitramj]

Thank you so much for your support ! This helps a lot.