How to prevent surfaces from deflecting infinitely in a linear static analysis.

I am using a 2D mesh to simulate stresses in a rotating frame, with cross bracing.

The bracing components are constrained using "Mesh Independent Ties", they have thickness associated with them, and material properties of steel.

When I run the solver, the surfaces deflect uncontrollably causing the "Static Analysis Encountered Mechanisms" Error to appear.

The simulation was working, and then I split some surfaces to create a denser surface mesh at critical locations (not near the problematic surfaces), and then the problem appeared.

I tried deleting the problematic surfaces, and recreated them, but this did not solve the problem. This has happened more than once now, and I would like to identify the problem, to avoid having to redo hours of preprocessing.

0 gerhardr over 3 years ago

The problem was with the constraints between the midsurfaces.

When extracting the mid-surfaces, the thickness of members was considered, leading to spaces at the joints. When multiple surfaces intersected, the glued contact did not perform as intended.

Extending all of the surfaces to make contact (using the vertex drag tool) solved the problem
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