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Discrete Rigid Rotation

Discrete Rigid Rotation

Discrete Rigid Rotation

(OP)
hello every body
could anyone help me with this problem please?
i made a 3D shell discrete rigid body and sketched a circle with 100mm diameter.then i made a General Static step,after that i defined one boundary condition at reference point of rigid body with U1=0 , U2=0 , UR3=2rad. after analysis i saw that rigid body expanded and its shape has changed and became bigger.could anyone help me with this problem and tell me the cause of this problem?
thank you all.

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