Learning Forum

[jjfabular]

Hi,

 

Is anyone here encountered this error in ansys spaceclaim? 

"Patch surface is self-intersecting".

I was trying to create a surface from an .stl file. Attach is the model I am working with. 

Thank you very much. I hope there's someone who could help me with this.

[peteroznewman]

Create a .zip archive file containing the .stl file.  You can attach .zip files after you post, you cannot attach .stl files.

Or use Workbench to create a .wbpz Archive file. These can also be attached.  You cannot attach a .wbpj file.

[jjfabular]

Hi Peter, 

 

Sorry about the attachment. I'm attaching here again the .zip file I'm working on. 

I was able to make surfaces from the stl file, however I cannot merge those surfaces. I always get this error: 

 

I wanted to make it as one whole surface so I can upload it to ansys ACP. I hope you could help me with this. Thank you very much.

[peteroznewman]

It is not always possible to reduce complex surfaces to a single surface. You have done well creating those surfaces. I don't use ACP so I don't understand the need to have a single surface instead of a collection of surfaces.

[jjfabular]

Hi Peter,

 

What I'm trying to do is to make my geometry as one single body. However, I always get an error when tried combining all the surfaces.

 

When I conducted a static structural analysis, it treated each surfaces as separate entity rather that one whole body. 

Is there any ways to make my geometry as one whole body?

Thank you very much.

[peteroznewman]

If you bring those surfaces into Mechanical, you can mesh them, and the mesh can be connected. Therefore, the mesh becomes one whole body, even though there are separate surfaces underlying the mesh.  What is the problem you have in Static Structural?

[jjfabular]

Hi Peter,

 

This is what I got when I tried running the simulation. 

and here is my imported geometry.

One can observed that the maximum principal stresses occur at the area where the surfaces meet. I am guessing that ANSYS consider each surfaces as separate entities. I don't have an idea yet how to connect the mesh. 

[peteroznewman]

I think the maximum principal stress is in that area because there is a change in the curvature of the geometry and has nothing to do with the how the surfaces are split.  I expect you could create surfaces that did not split at that location but above and below it, and you would get the same stress because it was from the same underlying geometry.

The mesh is connected or it would not have solved.

[jjfabular]

Hi Peter,

 

I did other simulation, and indeed it gave similar results! Thank you very much for your help.