Force and stress on pipe

Hi,

I have a titanium pipe of 6.35mm /1/4 inch) diameter with a wall thickness of 0.8mm. I want to place a 2 mm thick "collar" 10mm from the end of the pipe that will apply a compressive force to the pipe such that it remains on the pipe. The collar has the same outer diameter but can be reduced in diameter by 1mm. How do I do about applying this uniform inward (to the central axis) force? I want to determine the stress in the tube and see how much it will deform and the stresses in that region. I use Creo Simulate