Create Instance with different materials without using TIE Constraint
Create Instance with different materials without using TIE Constraint
(OP)
Dear all,
I have two different volumes, an inclusion and a cylindrical volume, which consist of two different materials. The inclusion should be insert in the cylindrical volume, that means the two parts should act as a single volume upon loading to analyse the stress concentration.
My idea was to define different materials / section assignments in the part modul and then use merge with retained boundaries to create one instance, so I can mesh the two volumes as one without using tie constraints.
However, preparing a data check, I get lots of warnings concerning tie constraints although I didn't define any constraints (see attachment with warnings; the 8783 nodes in the first line are the nodes along the retained boundaries).
The results were plausibel, but does this mean that I have to define tie constraints?! If so, what's the best way to create tie constraints - use cut in the assembly modul to create a "hole" with the shape of the inclusion in the cylinder and then insert the inclusion per merge?
I have two different volumes, an inclusion and a cylindrical volume, which consist of two different materials. The inclusion should be insert in the cylindrical volume, that means the two parts should act as a single volume upon loading to analyse the stress concentration.
My idea was to define different materials / section assignments in the part modul and then use merge with retained boundaries to create one instance, so I can mesh the two volumes as one without using tie constraints.
However, preparing a data check, I get lots of warnings concerning tie constraints although I didn't define any constraints (see attachment with warnings; the 8783 nodes in the first line are the nodes along the retained boundaries).
The results were plausibel, but does this mean that I have to define tie constraints?! If so, what's the best way to create tie constraints - use cut in the assembly modul to create a "hole" with the shape of the inclusion in the cylinder and then insert the inclusion per merge?





RE: Create Instance with different materials without using TIE Constraint
Did you create the constraints before merging? They may have been carried over as intelligent as Abaqus can when you merged. Imagine if you have a fixed face then merge 2 parts the face should probably still be fixed.
I hope this helps.
Rob
Rob Stupplebeen
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RE: Create Instance with different materials without using TIE Constraint
In my opinion the problem is, that I define the section / section assignment of the cylindrical volume using "region". This means the faces of the inclusion are involved in the section assignment and then, defining also a section assignment for the inclusion, there is an overlap. Is this possible and how could I avoid the overlap?!
My CAE file is to big. However, I created a python script, which generates my model without the sections / section assignments. You just have to edit the path to the inclusion in line 49. Maybe this helps finding the mistake in my procedure.
RE: Create Instance with different materials without using TIE Constraint
By the way what is this? The IGS looks very odd?
Thanks.
Rob
Rob Stupplebeen
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RE: Create Instance with different materials without using TIE Constraint
I hope it works.
The IGS is an inclusion obtained by X-ray CT. For importing in Abaqus as a volume, the inclusion was reconstructed in a reverse-engineering process. That is the reason for the initial partitioning on the surface. However, using virtual topology, the "patches" on the surface are removed later.
Thanks!
Marcel
RE: Create Instance with different materials without using TIE Constraint
1. Deleted merged solid and emptied the assembly.
2. Added both solids to the assembly.
3. Translated the inclusion 1 unit down.
4. Merged instances deleting the original and retaining the boundaries.
5. Tet meshed with default seeding.
6. Boundary condition 'FixBottom' only constrained in 1 direction changed to all 3
I hope this helps.
Rob Stupplebeen
Rob's Engineering Blog
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RE: Create Instance with different materials without using TIE Constraint
Thanks!