Why does interference fit cause displacement like this in my model?

[drennon236]

I have two steel cylinders which I made sure penetrate each other slightly, and then I tried slave adjustment to get proper contact, however this does not give full contact, only some parts are sticking and sliding while most of the area is open. I have no load, BC's, the step is dynamic implicit with moderate dissipation. The two cylinders should always be sticking. I do get sticking/slipping over the entire surface with interference fit, but I also get big displacements. I can counteract by applying BC's, but that is not how my BC's are supposed to be.

Uniform allowable interference fit:

Automatic shrink fit:

I tried doing another cylindrical model from scratch and got the same issues. I am not sure where to look for errors in my model any longer.

 

[FEA way]

You can try refining the mesh properly and using different contact settings (maybe even general contact).

 

[drennon236]

General contact is only available in explicit if I understand correctly?

 

[FEA way]

No, general contact can be used both in Abaqus/Standard and Explicit. In fact, that's the recommended/default type of contact (because it's reliable and easy to use). General contact even supports interference fits.

 

[drennon236]

Its just that I have to use Dynamic, implicit. Unfortunately I will have to find a way to make surf-to-surf work.

 

[FEA way]

You can use general contact in dynamic implicit analysis as well. It belongs to Abaqus/Standard solver just like general static.