Assign materials to elements without remeshing in Python

[alexemse]

Hi All !
I didn't find anything on the forum unfortunetly.

Here is my situation :
- I have a 2D domain meshed (by instance).
- I'd like to assign 2 different materials to 2 different groups of elements.
- I want to keep my mesh.

For the moment I just splitted my domain into 2 groups of elements (elRegion1 and elRegion2).

elRegion1 = regionToolset.Region(elements=elData[0:nb_el_demi+1])
elRegion2 = regionToolset.Region(elements=elData[nb_el_demi+1:nb_el])

And then I have for instance :

elRegion1.elements[1]=({'connectivity': (14, 15, 21, 20), 'instanceName': 'plaque_ref_instance', 'label': 13, 'type': CPS4R})

1st question : How can I divide my domain into 2 groups and then assign 2 materials without remeshing.
2nd question : Can I assign the mesh to another instance without meshing directly the other instance (having : elRegion1.elements[1]=({'connectivity': (14, 15, 21, 20), 'instanceName': 'new_instance', 'label': 13, 'type': CPS4R}).)

Thank you so much for our answer !

 

[xerf]

If you have a native part you should partition the domain then assign a different section to each region created by partioning and then mesh the regions.

 

[alexemse]

Actually I defined different element sets from my mesh and different sections(with different materials). Then I assigned properties with this type of syntax :

myPart.SectionAssignment(region = elSet[i-1],sectionName = tab_nomSection[i-1])

Thank you for your answer !