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Unwanted Motion in Theta Plane During Radial Expansion

Unwanted Motion in Theta Plane During Radial Expansion

Unwanted Motion in Theta Plane During Radial Expansion

(OP)
Hi, I am brand new to these forums and fairly new to abaqus as well.

I am doing a simple radial expansion on an axi-symmetric semicircle with a smaller semicircular hole in it. In order to do so, I created a datum CSYS that is cylindrical in nature but aligned with the global CSYS. In other words the R axis is the X axis and the T axis is the Y axis. After applying my displacement boundary condition to the inner semicircle to expand outward, I get the desired radial displacement, but I also get some varying motion of the nodes in the theta plane about 2 orders of magnitude lower than the radial displacement magnitude.

Any idea on why that might be? My sides of the semicircle are constrained with a XSym boundary condition and my outer surface of the semicircle is encastred. Is this due to the compression of the elements? And if so, is it unavoidable? I wouldn't want to create another boundary condition preventing theta-plane displacement?

I am uploading the input file.

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