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What kind of contact should I put here?

- September 17, 2025 at 6:33 am
  
  rajat
  Subscriber
  
  I want to run a modal analysis on an assembly. The image attached is a simplified version of it. The "mount" attaches to the plate via bolts (red) from below and is threaded (blue) onto the mount. What kind of contact should I put at the interface (yellow).
- September 17, 2025 at 2:09 pm
  peteroznewman
  Subscriber
  The real connection is frictional contact between the mount and plate with a bolt pretension on the fasteners, but Modal is a linear analysis so you can't have that behavior. There are two linear options that will have slightly different Modal frequencies.
  1. Bonded Contact between the base of the mount with an imprinted face on the plate (no bolts).
  2. Two Fixed Joints between the blind hole in the mount and an imprint of the bolt head (or washer) on the plate face (no contact at the yellow mount face).
  If you measured the modal frequency of the mount bending about the base, it would probably fall somewhere between these two models.

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