[KratosContactStructuralMechanicsApplication] Error during simmulation start

[noah1510]

We have a use case where the we want to bend a partly fixed object until parts of it reach a given position.
Getting the bending + fixing part working using StructuralMechanics did work.
To define the end condition my idea was to use ContactStructuralMechanicsApplication with an unnmovable object as end.
However no matter what I tried I don't get the simulation to start, it always produces error during the setup of the model.
I use a python script that converts given stl files to mdpa using gmsh.

I used the Kratos Build from PyPi and tried both Version 10.3 and 10.4.
All testing is done on windows x86.

This is the data I used:

material.json
output.txt
ProjectParameters.json
MainKratos.py
slab3_thin.mdpa.txt

Do you have any idea what might be wrong with this data?
I can provide the generator script in case you need it but for now the given data should be enough to at least reproduce and investigate the issue.

[loumalouomega]

Is this defined manually?, the definition of thej contact process looks incomplete. Use a test or example as template to configure the contact

[noah1510]

I tried doing that. The problem is that I don't know what the master and slave parts of the contact do, nor how I should generate them from my mesh. Is there any documentation regarding this?

[loumalouomega]

I tried doing that. The problem is that I don't know what the master and slave parts of the contact do, nor how I should generate them from my mesh. Is there any documentation regarding this?

The master/slave are "arbitrary", I recommend the slave to be the one is moving in case the movement is imposed, or the one with the finer mesh if not. Otherwise is "arbitrary". BTW, the reference I used named slave what is commonly called master, in case you are lost as many people using contact for the first time.

There is a process for automatic contact, but I don't recommend it because is much less stable than manually assigning roles.

[noah1510]

If I define master and slave parts (in this case they are identical) like in the attached code, I don't get an error.
However Kratos just hangs at a certain point.
The logs also show warnings regarding a migging YOUNG_MODULUS.

I also tried using conditions but that causes an error.
If I use the nodes interface, I get a warning but no hard error.

material.json
output.txt
ProjectParameters.json
slab3_thin.mdpa.txt
MainKratos.py

[loumalouomega]

If I define master and slave parts (in this case they are identical) like in the attached code, I don't get an error. However Kratos just hangs at a certain point. The logs also show warnings regarding a migging YOUNG_MODULUS.

I also tried using conditions but that causes an error. If I use the nodes interface, I get a warning but no hard error.

material.json output.txt ProjectParameters.json slab3_thin.mdpa.txt MainKratos.py

Contact model parts MUST contain conditions and nodes

[noah1510]

What type do I have to set for the conditions?

SurfaceCondition3D3N causes errors.

[loumalouomega]

What type do I have to set for the conditions?

SurfaceCondition3D3N causes errors.

That should work. i do not recommend to set it manually. Please use Gid, there is support for contact there. Once you have a mininal case working modidy it, but don't do the inverse.