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What causes penetration in the compression simulation?

- July 9, 2025 at 3:34 pm
  
  b23040001
  Subscriber
  
  Could anyone tell me what might be the reason for the penetration of the rigid sphere (*MAT_020) when compressing the compressible foam material (*MAT_063) (as shown in first Figure)? The contact settings are depicted in the second figure, and self-contact has also been set.
- July 9, 2025 at 9:30 pm
  
  Dennis Chen
  Subscriber
  
  try using contact_automatic_surface_to_surface_offset and change the SAST and SBST with a negative number to represent the "search range". Interestingly enough, ansys workbench ls-dyna automatically outputs contact in this format and with the correct setting so this kind of problem doesn't happen. :)
- July 10, 2025 at 2:24 am
  
  b23040001
  Subscriber
  
  Thank you very much, Dennis! Let me try the way you suggested.

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