Displacement increment for contact is too big

[tomtom412]

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

 

[Mustaine3]

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.

 

[VishnuVP]

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