How to fix unintentional overclousure

[rofor]

Hi all,

I am working on a 3D discrete rigid model in which two objects come in contact in order to simulate their earthquake response.

The problem is that at the starting moment the object above penetrates into the other one, and this penetration still continues for all the analysis time (as you can see in the picture I attached).

How can I delete that overclosure?

I already found some answers about that and I tried to make all the adjustments, but still, the problem persists.

I specify that:
1. The surfaces are meshed enough (and the slave one has got the finer mesh)
2. I used the fining sliding formulation
3. The time increment is small enough
4. I added a "Hard-contact" in the Interaction Properties
5. I used strain-free adjustments in order to resolve the initial overclousure

I appreciate any help you will give me!

Thanks and regards

 

[FEA way]

Based on the attached picture, I can tell that you work in Abaqus. Make sure that reference points of these rigid bodies have properly assigned mass/inertia. You could also try using general contact instead of contact pairs, it helps sometimes.

 

[rofor]

Dear FEA way,

thank you for the answer. Both RPs have inertia and mass assigned. I used general contact and nothing has changed.
In another thread (

https://www.eng-tips.com/viewthread.cfm?qid=290999)

it said that using penalty contact a little overclosure between contact surfaces is allowed.