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Tiebreak using Segment set for contact b/w 20 node Hexahedral elements

- October 13, 2026 at 2:15 pm
  
  pdsamuel
  Subscriber
  
  Hello,
  
  I have been trying to use tiebreak contact (CONTACT_AUTOMATIC_ONE_WAY_SURFACE_TOSURFACE_TIEBREAK) [Option 9] with the 20 noded Hexahedral solid element (ELFORM 23). When I select the surfaces using the segment set approach- it keeps giving me an error that certain master, slave surfaces have not been not found.
  
  Because this didn't work, I then tried defining tiebreak contact using the PARTIDs. But, with this approach the nodes on the middle of the edges don't get selected and only the nodes on the corners are tied. I strongly prefer to use the segment set selection of tiebreak surfaces, and need to know to how to execute this for the 20 noded hexahedral elements.
  
  Also another associated issue is that when I use a regular a contact definition between two hex elements and apply a closing/compressive load, there is interpenetration at the middle nodes (i.e. the nodes in the middle of the edge)- which should not occur.
  
  Requesting ANSYS personnel to help figure a solution to these problems on priority.
  
  If the model files need to be shared, please advise on who this should be sent to?
  
  Thanks

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