Hello! I’m currently working on a 2D section of a pneumatic cylinder, trying to study its response due impact.
I started with a simply static step to figure out the most stressed part in the model but the analysis istantly fails with this messae from CalculiX:
Can anyone help me solve this problem?
I attach the PrePoMax file to this post.
impact_cylinder.pmx (412.8 KB)
You should use solid, not membrane section for axisymmetric models. But also change the model space from 2D plane stress to 2D axisymmetric (Model → Edit):
And edit all parts to change the element type to CAX…
Finally, use Geometry → CAD Part → Flip Face Normals to make sure that all face normals point in the +Z direction:
Regarding the rest of the setup, there are some missing contact interactions such as contact pairs (there should be a contact pair or tie constraint between all touching parts).
Initial velocity is only applicable to dynamic analyses. You can use e.g. gravity load instead.
Just a quick example with some modifications:
impact_cylinder_mod.pmx (399.2 KB)
Tank you so much for helping me, really appreciate it!
