ABAQUS Cylindrical Boundary Conditions

Dear all,

 I am trying to learn ABAQUS using this problem (what I thought would be simple enough):

Intial Geometric Configuration: A Disc (thin) with a finite radius (1 unit) and a wedge (5 degree pie) cut off. So it is basically a disc with material present only from angles 0 to 355 degrees and the material from 355-360 degrees is removed.

Cylindrical Boundary Conditions: Displacements degrees of freedom are UR(r,phi) in the radial direction and Uphi(r,phi) in the tangential direction

   1) Uphi(r,0) = 0

   2) Uphi(r, 355) = 5 (in degrees)

Basically a displacement boundary conidition is applied such that the wedge is closed. I want to find the stress distributions in the final configuration. I have the part and mesh set up but I am not sure how to define these boundary conditions. The boundary conditions that I find for "Displacement/Rotation" are in Rectangular Cartesian Coordinate system. Not sure how to define these displacement boundary conditions in cylindrical coordinate system. Any suggestions are appreciated.

Thanks,

Rakesh