Hello, I have a model of a small shaft-hub connection with a shrink fit consisting of two steel parts, but the resulting stresses seem off and I haven't been able to find a way to resolve it.

The ring has a diameter of 80mm and the whole thing is slowly rotating with 10 cycles per minute resulting in a centrifugal force. There is contact between the two parts, but no friction. Despite the initial step there is one step for the rotation. For the shrink fit, I have defined an overclosure of 0.05mm (0.00005m in Abaqus) and got max. stresses around 728 N/mm². However, I noticed no matter how much overclosure I define the results always stay the same, which doesn't make any sense to me. I got the same stresses with 0.0005mm overclosure. Does anyone know a solution to this?
I have included the most important keywords below and a screenshot of the results I get. Thank you in advance!

Abaqus ​​​

** INTERACTION PROPERTIES
*Surface Interaction, name=IntProp-1
1.,
*Friction
0.,
*Surface Behavior, pressure-overclosure=HARD

** BOUNDARY CONDITIONS
** Name: BC-3 Type: Displacement/Rotation
*Boundary, op=NEW
shaft-1.Set-1, 3, 3
shaft-1.Set-1, 4, 4
shaft-1.Set-1, 5, 5
** Name: BC-4 Type: Displacement/Rotation
*Boundary, op=NEW
hub-1.Set-1, 3, 3
hub-1.Set-1, 4, 4
hub-1.Set-1, 5, 5

** INTERACTIONS
** Interaction: rotation1
*Contact Pair, interaction=IntProp-1, ADJUST=0.0001, type=SURFACE TO SURFACE
hub1, shaft1
*CONTACT
*CONTACT INCLUSIONS, ALL EXTERIOR
*CONTACT INITIALIZATION ASSIGNMENT
hub, shaft1, shrink_fit
*CONTACT INITIALIZATION DATA, NAME=shrink_fit, INTERFERENCE FIT=0.00005

** STEP: rotation
*Step, name=rotation, nlgeom=YES, inc=2500
*Dynamic
0.05,5.,5e-05

** LOADS
** Name: Rotation2 Type: Rotational body force
*Dload
shaft-1.Set-1, CENTRIF, 1.09663,0.,0.,0.,0.,0.,1.
** Name: Rotation_hub Type: Rotational body force
*Dload
hub-1.Set-1, CENTRIF, 1.09663,0.,0.,0.,0.,0.,1.

** INTERACTIONS
** Interaction: rotation1
*Contact Interference, shrink
hub1, shaft1