Erik, I see you're in Sweden, but I stick to english for the sake of other forum members.
I'm not 100% sure I understand your problem correctly. This sounds like a problem that can be run using 2D axisymmetry. Steven Dunker's solution works if you know the force. If it is a shrink fit, then the force might not be known. In that case you can do a contact analysis. If you have the advanced version of Creo Simulate, then you can also run the contact analysis in 2D and also include plastic deformatiions. 2D analysis is helpful when running nonlinear problems such as contact/plasticity, analyses that otherwise become very time consuming.
