Hi,

I am trying to analyse a cylindrical shell subjected to global bending moments applied through the centre of mass. Hence, I needed to create a Reference point and kinematically couple this reference node with the slave nodes. I have tried all I could but I keep getting the warning:

Whenever a translation (rotation) dof at a node is constrained by a kinematic coupling definition the translation (rotation) dofs for that node cannot be included in any other constraint including mpcs, rigid bodies, etc.

1 nodes lie on the axis of their cylindrical or spherical transformation systems. The local coordinate systems at these nodes are not well-defined. The nodes have been identified in node set WarnNodeCylTransSys.

MPCS (EXTERNAL or INTERNAL, including those generated from rigid body definitions), KINEMATIC COUPLINGS, AND/OR EQUATIONS WILL ACTIVATE ADDITIONAL DEGREES OF FREEDOM

I have excluded the overlapping node but it still won't stop giving this warning message and it will just abort after about 5 attempts.

Can anybody help with an explanation of steps to achieve this? I'm so new to ABAQUS and it's becoming frustrating already.

Many thanks