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Why does rigid body motion often occur with LINK180 elements?

- June 6, 2022 at 9:58 am
  
  FAQ
  Participant
  
  LINK180 elements do not have any rotational DOFs. It is a ‘truss’ element. It does not have any bending stiffness. If you only constrain one node, it can freely rotate/pivot about that point.
  Some ideas to consider:
  1. Apply sufficient restraints to prevent rigid body rotation.
  2. When meshing lines with link elements only use 1 element per edge. Without bending stiffness, multiple links in series may have stability issues.
  3. If a series of link elements are required, you may need to apply an initial tension to provide stability.

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