merging operation failed

[Mechanicslearner]

Hello,

I am trying merge two surface parts but for some reason its not merging. Am very sure there is no gap between them. When ever I try it says merge operation is unsuccessful , I like to merge it so I can form the mesh because merge mesh did not work either. Can anyone help

 

[IceBreakerSours]

Can't you do it in a CAD package?

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[Mechanicslearner]

I tried merging there and importing here as a single part but it always says imprecise geometry when I import the model. So i have to import as individual parts and when I try to merge here its not working

 

[rstupplebeen]

Can you provide more information? What CAD program? File type? Can you upload any of these?

When I have seen these issues it's usually 1 of 2 reasons.

1. CAD errors such as small gaps
2. Import error. Abaqus has tighter tolerances than many CAD packages. You can try export options and file types.

I hope this helps.
Rob

Rob Stupplebeen
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[Mechanicslearner]

I am using rhinocerous 5 for geometry formation . I will attach .sat format now if you need anyother format let me know. I impoort this as .sat and chose individual parts

 

[Mechanicslearner]

You can see my attached geometry. I am quite sure there is no gaps. So if you succeed in merging the geometry please let me know

 

[rstupplebeen]

I opened your geometry and it came in as 20 surfaces. When I tried to import them as a single there were errors as you noted. Looking at the geometry I expect that modeling as beam elements may be more appropriate. The image below shows the aspect ratio for others to see and comment.

I have not had much experience bringing Rhino into Abaqus. Hopefully there are settings available to increase it's resolution. You could also try other file types such as: step, parasolid, IGS.

I hope this helps.
Rob

Rob Stupplebeen
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[IceBreakerSours]

If you zoom in, you will notice there are tiny features that CAE can not wrap its head around (for good reason). I would much rather do the geometry clean up in SolidWorks or something similar.

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[Mechanicslearner]

Hello Rob,

This is a simplified geomtry that I sent you because there will be surfaces in between the triangles. If I manage to merge these surfaces then the surfaces that comes inside the triangle is easy to merge. So i can use only as shell elements that is simple way to do. I have tried other formats too except parasolid. If I can solve using parasolid I will let you know until then I am keep trying. For two days am trying these. It will be much helpful if someone manaage to solve it

 

[Mechanicslearner]

I tried in parasolid format. It shows imprecise geometry I could not edit it. Is there anyother way to merge mesh of these parts that will be helpful too

 

[Mechanicslearner]

Hello,

After 3 days of struggle finally solved the geometry problem. I tried using merge algorithm in rhino 5 by taking away edges now it works.

 

[AlAzzawi]

Hi martmachado,

You mentioned in previous post that
"Since Abaqus accepts only some extension (.f, .for, .obj, ...) but not f90, the support provide me with a short environmental file telling Abaqus to expect any format, in this way f90 will be used but you have to rename your subroutine file to .for"


I have same problem can you please,send me the "short environmental file" to my email
ahmadsaddy@yahoo.com

Thanks for your help

Best Regards,
Alazzawi