Contact Surface Overclosure

[lyvince]

Hi all.
I'm having some problems in modelling a contact between two flat surfaces.
I use Abaqus/CAE to model one discrete rigid part and one 3D deformable part and put them into contact.

During the first run, bondary conditions are defined, no forces are applied and the analysis is okay.
During the second run, one degree of freedom for the rigid object is remove and a concentrated force is applied pushing it towards the deformable surface, and I get the "oveclosure" error.

So, my question is: By putting two parts with different property(rigid vs deformable) into contact, is there any precaution as to avoid the aboved mentioned error? Or rather is it possible to apply a force to these objects in contact.

(I've tried with surface contact between two 3D deformable object with the same setup/forces and the analysis didn't give me any error)

Thanks.

 

[tld23]

Dear lyvince,
I assume that you are using ABAQUS/Standard. Look at the following things:

1) Check that the 3D rigid is the correct way around, ie that the outer surface of the rigid is facing the deformable.

2) Contact analyses generally do not like force loads prior to the bodies touching. The loaded body may try to accelerate until it "crashes" into contact. The time step will then be much too big and penetration or over-closure may occur which the code cannot correct for. If you can use displacement control to initiate contact, and then apply the load. Alternatively introduce some damping.

3) Try using the 'adjust' parameter on the '*contact pair' card and defining the surfaces as starting very close to each other.
TERRY