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Displacement increment for contact is too big

Displacement increment for contact is too big

Displacement increment for contact is too big

(OP)
Hi all,

I am running a static general step, with general contact defined & frictionless intprop.
I have a initial inc size of 0.001 and min of 1e-08 with max number of incs set to 1000.

The model is a tube deflecting off a bend in a larger tube, and as they come into contact, Abaqus cannot go any further as the contact seems to be creating a problem. I have tried reducing the increment size etc.. and played with the meshes, but with no luck.

I have this running fine in a dyn explicit step analysis. Was curious as to how it would run in a static step. Perhaps this is an inappropriate step type to use? I am not sure as I am relatively new to the software.

Any guidance at all would be great, as information online pertaining to the error is not helping. My input is attached.

Thank you all :)

Regards,
Tom

RE: Displacement increment for contact is too big

I've run the input file and it shows convergence issues with the contact, not with the displacement criteria.

For A/Standard it is hard to have all the contact happening at one node. Add a fillet at the edge of rod and refine the mesh to get more nodes in contact. That might help. Also refine the tube to get a smoother contact surface inside.

The element type is also not good. A coarse mesh with C3D8R is likely to create trouble.

RE: Displacement increment for contact is too big

Try with a small tolerance of 0.0001 on the interaction module.

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