I`ve got a big assembly cut in half and would like to run a simulation using the symmetry feature. But it`s telling me I can`t do symmetry on beams. Is there anyway way around this? The assembly has beams and solids.
If I take the beams out of the selected faces and only select the other faces (that are sheet metal) i`m getting another error "The plane of symmetry can only be defined using coplanar faces and the plane of symmetry cannot intersect model geometry"
Not the friendliest of features to use.
The model is perfectly cut in half, it`s not intersecting with anything.
don't use the symmetry constraint. Just apply the equivalent restraints reference to some geometry or plane. They would be 0 for translations normal to the plane of symmetry and a 0 restraint for the two axis that are in directions not normal to the plane of symmetry.
The program is correct in that the 'Symmetry' fixture is not designed for Beam and Shell type elements. My only guess as to why this is would be that selections from these objects (joints and edges) do not make it obvious where the symmetry is. You can, however, manually define a symmetric condition that works for both shells and beams like Bill McEachern described which this video also shows (GoEngineer - Simulation: Shell/Beam Symmetry Fixture).
Hi Bill and Ryan
Sorry for the delayed reply. I just tried to do the symmetry with the technique shown in the video that Ryan posted. It worked for the shells, but i`m still getting the error on the beams "Load/Restraint cannot be applied to beam face, edge, or vertex"
Looks like I`ll have to change them over to solids
You should file it as a bug then. It should work.
Just to clarify for myself, are you applying the fixture to the beam joint lying on the symmetry plane or to a face/edge on the beam itself? I would not expect the fixture to function properly if it were not attached to the joint.
EDIT: Just for reference I made a small mock-up model (v2017) where a weldment system is analyzed as a whole model and a half model. The displacements show to be the same between the two setups.
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