How can I solve this ABAQUS CAE error: “96 nodes are missing degree of freedoms. MPC/Equation/kinematic coupling constraints cannot be formed"?

Miguel angel del Castillo @Miguel-Del-Castillo-4

26 April 2024 1 9K Report

Hello, I am making a model of an airplane fuselage, consisting of the fuselage, frames and stringers. I have made “tie” joints between the different fuselage parts, and between the frames and spars, with the fuselage. The frames and spars do not interact with each other.

In addition, I have linked the displacements of the ends to two reference points, by means of “equation” with different sets. I have also linked the displacements of the ends to two reference points by means of “equation” with different sets. However, when I simulate it, I get the error “96 nodes are missing degree of freedoms. The MPC/Equation/kinematic coupling constraints can not be formed. The nodes have been identified in node set ErrNodeMissingDofConstrDef” and I don't know how to solve it. Does anybody know how to solve it?

The model is "modelo-equation"

Alvin Molberg

Verify that the constraint definitions (such as nodes missing degrees of freedom) are set up correctly.

Ensure all nodes have the required degrees of freedom.

Make sure the reference frame is consistent across all parts of the model.

Try simplifying the model by removing some of the constraints to identify the source of the issue.

Check for any duplicate nodes or elements.

Refer to the software documentation to understand the requirements for defining constraints.

https://caeassistant.com/blog/applying-moment-loads-abaqus-torque-load-video/

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