... Which may have invalidated some of your applied supports such as displacement, cylindrical, frictionless, or compression only supports. Refer to Troubleshooting in the Help System for more details.

In a large deformation analysis, the program updates the nodal coordinates as the solution progresses towards the final configuration. As a result, supports that fix only some of the degrees of freedom of a node but not all (for example fix only UX=0), may become invalid as the model's nodal coordinates and thus nodal rotation angles are updated. The imposed DOF displacement directions do not change even though rotation angles change. This may or may not be a desirable situation. A classic example is a simple torsion of a rod. Initially the nodes at zero degrees have a circumferential direction of UY but after a twist of 90 degrees, have a circumferential direction of UX.

The user is responsible for determining if any nodal rotation at the support is significant enough to cause undesired results.

The following is a list of supports which only fix the movement of a node partially and thus are susceptible to large deformation effects:

In addition a Compression Only Support may be susceptible to large deformation effects because if large sliding occurs, the face can literally "slide off" the compression only support.