If you want to simulate only axial loading, a one element thickness model with simmetric boundary conditions will be enough, you can include the housing and upper ring with contact for making more realistic and easy to apply boundary conditions. But if you need radial (or conical) loading, you need a half or complete model of the part. And last, if you need torsional/tangential loading, then you need the complete model.
There’s also axial symmetry commonly used for various gaskets, mounts, and other rubber components: Hyperelastic contacts in axisymmetric model
And more versatile (applicable to torsional or centrifugal load as well) cyclic symmetry, but this one is available in PrePoMax only via the Keyword Editor: Cyclic symmetry
Finally, it’s sometimes possible to replace cyclic symmetry by a thin sector with BCs in cylindrical coordinates.
Apart from saving computational effort, those techniques also greatly simplify BC setup.
It is 0.3mm in Tangentially (Z global below) at “1” (Node 62). There is a similar issue at “2” (Node 608)
I added more constraints to the edge because it seems the displacement constraint on the bottom does not capture the edges. When I force the same constraint on the edge, the problem goes away. I will still need to constrain the edges at 1 and 2 below also because they are also seeing the same problem. It seems without this new displacement constraint, the edges are fixed, even though I don’t have them fixed.
Mesh Parameters:
