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Circular pattern in assembly, STENT

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cfeng11

Mechanical
Feb 29, 2016
2
Hi, I'm pretty new to using Abaqus. For a school project I'm learning how to analyze a stent for medical application.

I created the part in Solidworks and imported as either .igs or .stp files into Abaqus. I meshed the part and created assembly using circular pattern. At this point, I have a circular stent, and the entire stent is meshed (dependent mesh from part ).

After a few other steps, such as create contact and specify load, I ran the job. The job was aborted because it seems like the parts created from the circular pattern are not merged, see picture.

I went back to the assembly and tried using the merge tool to connect the joints.

1. At first the parts were created from .igs files. I wasn't able to merge both geometry and mesh. when merging geometry alone I got an error saying cannot merge due to virtual topography.
2. I recreated the part from .stp file. The part imported as shell, then I created the solid from the shell. when merging geometry in the assembly, it simply says the merge was unsuccessful.
3. It allows me to merge the mesh only. But if I merge the mesh, there is no longer association with the geometry, I wasn't able to apply interaction or load to the mesh assembly.

Questions:
1. when creating a circular pattern, how do I connect the parts into one solid?


Thank you1
 
 http://files.engineering.com/getfile.aspx?folder=060aa1bd-ee21-41dd-9751-e30b63830a54&file=Picture1.jpg
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Your part has circumferential symmetry, do you need to model the full stent?

If so, you can draw and mesh your part in a planar configuration which should make meshing the part a bit easier. Then you can wrap the part around the longitudinal axis using *NMAP. You will lose the connectivity between the geometry and the mesh but you don't need it to define BCs/loads/interactions.

 

@IceBreakerSours: Do you mean that both the geometry and the mesh need to be merged, to main the association of mesh to geometry?

@Dave442: The other option I was thinking of is to just model part of the stent.


Thanks!
 
Either. However, Dave's suggestion makes a whole lot more sense. Just model a part of the stent that gets repeated. Also, you might want to talk to Simulia about this. I do not know if they can help you given that you are in the academic world but they have a plug-in/subroutine for this sort of work which makes analysts' lives easier.

By the way, this forum has a policy against student postings. Read the FAQs.

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