Structural & Thermal

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  3. Why does rigid body motion often occur with LINK180 elements?

Why does rigid body motion often occur with LINK180 elements?

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    • June 6, 2022 at 9:58 am
      FAQFAQ
      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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