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Convergence using TIE

Convergence using TIE

Convergence using TIE

(OP)
Hello!

I'm running simulations of two thin and long shell (S4R) structures connected by a mesh tie constraint where they cross. The analysis is run with nlgeom and it runs fine with a constant increment all the way until a certain point in the deformation when it abruptly decreases the increments to maximum and fails due to convergence error.

Any helpful tips very much appreciated!

Some more information:
I've tried automatic stabilization, finer mesh (it often work with course meshes by the way), linesearch algorithm, but none has any effect. Changing the mesh has some effect but as I need a fine mesh in the interface between the two structures it is not really an option. The simulation is run under displacement control and purely mechanical BC and loads. The material behavior is transverse isotropic and the rotations are pretty large, though the strains are not. I've also tried surface based TIE but it fails also.
I'm running out of ideas.

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