I would like to determine stiffness of a bearing by performing FEM analysis.
Here is the model:
I'm studying the model on only a slice.
Boundary condtions are:
- one fixed face
- one axial force
- no penetration contact conditions everywhere
- shrink fit contact condition on the faces that are highlighted on the next image
Bolt connections on two holes:
The interference on the faces where shrink fit contact condition has been put is really low. Here is an esitimate of the diameters:
One radius is 54.9515 mm and the other is 54.950.
The interference is therefore 0.0015 mm .
SolidWorks help file states that the shrink fit contact condition is ok to use only if interference is 0,1 % of the bigger diameter.
In this case we have:
0.0015/(54.9515*2) = 1.364e-5 = 0.0013 %
Infact, if you look at the deformed shape (in attach is the video) it looks like the interferering component is applying a too high force to prevent interference.
What should be done in this case:
- Should you just remove interference and use a no penetration contact condition ?
- Is this "high interference force" due to the fact that the mesh is too coarse ?
- Should I use a very fine mesh (maybe as big as the intereference (0,0015 mm) ?
I'm unsure about what I should do because there are very smal displacements and maybe even the preload due to the shrink fit contact could play some role.