Hi Jonathan,
even if is passed about 6 years, I would to ask you to explain this phenomenon.
I've a similar problem: I want to rotate a drum around its axial hole, imposing the angular displacement. All of this in a LDA (large deformation analysis) in Creo 3.
What happen is that during the rotation the drum grows radially and the stresses are very high even if there are no load, only a rotation imposed around a hole used like a pin.