Hallo Kai.
Ich hoffe, ich überfrachte dich nicht mit dem Englischen ...
Hier mal (hoffentlich) etwas Hilfestellung.
The error message appears when the model is not fully constrained or if the matrix becomes singular. This situation may arise when:
For a part model with a single body, one or more of the 6 rigid body motions are not prevented by proper constraints, or you haven't used the Stabilize the model using soft springs option.
In your assembly model or part with multiple bodies, the default global contact option is set to Free, allowing all touching parts to move freely
In your assembly model or part with multiple bodies, one or more parts don't touch the others, and therefore they are not restrained, or the defined contact conditions allow one or more body to move freely in at least one direction.
In your assembly model or part with multiple bodies, the restraints and/or remote displacements are not sufficient to prevent all rigid body motions.
You activated the Inplane effect flag and with the applied load, buckling is predicted. The inplane effect reduced the stiffness so much that the stiffness matrix is singular.
...
Troubleshooting methods
You should review your model in any case. Look for insufficiently restrained bodies. Bodies can be retrained either through the application of restraints and/or remote displacements, and by contact definitions. Therefore:
Check the applied restraints and/or remote displacements.
Check the global contact definition and all the defined contact sets.
if you activated the Inplane effect flag, run a buckling analysis to check if buckling is predicted. if it is, then the Inplane effect flag will cause the static analysis to fail. This is normal. You should try a Nonlinear analysis, possibly with Arc length control method.
In some cases, this error occurs because the mesh isn't compatible (the mesh is made out of several independent blocks). During the solution, the program finds that at least one of these parts is free to move.
Another way to troubleshoot this kind of problem is to use the Soft Spring option of the Static analysis properties. Then, run the analysis and look at the displacement plot you will see that some bodies/shells didn't move along with the rest of the structure. Typically, these bodies/shells stick out of the model and experience either a large displacement compared to the rest of the model (if a load is directly applied to them) or a null displacement (if no load is directly applied to them). You will probably have to use split lines to make sure the mesh will be compatible or check whether small gaps or interferences exist in your model.
Gruß
Roland
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Ich bin nicht so, wie ich aussehe ...
Im Gegensatz zu Anderen.
Die sind so, wie ich aussehe ...
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