Hi Guilherme,
One thing I might add to this discussion is the use of preloaded fasteners due to wrench torque. I’ve attached a document to illustrate how to use the preload. It’s for WF4, but it will work in Creo 2.0. This is one area that’s overlooked, and there’s not much documentation out there to tell you how to use preloads.
I highly recommend reading and working the example in the attached document so you may become familiar on how to obtain the right preload for fasteners. You have to make two runs in Simulate in order to accomplish this, yes, even with Creo 2.0. I think this will change for Creo 3.0.
I’ve attached another document that explains infinite friction, along with other Mechanica contact theory, and this is really used to indicate slippage. It’s called “friction” in WF4, but when you enable infinite friction, the elements actually bond together. This is still the same for Creo 2.0.
I have always turned the Fix Separation off and placed contacts between bodies. When you enable Fix Separation, the edges around the holes will bond, and when you deform the model, you will see where the edges are “glued”. But it depends on what your region of interest it.