change of volume in a rotating shaft.

[mortezataghdisi]

Hi
I have modeled a simple shaft with to bearings and i apply a torque to the shaft. The problem is that in the results the volume of shaft increases while it is rotating?!

Anybody could give any solution?
Thank you in advance

 

[IceBreakerSours]

How do you know the *volume* increases?

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[mortezataghdisi]

It can be seen when i plot deformed shape by "plot contours on deformed shape" in result section.