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Inflation of angioplasty balloon

Inflation of angioplasty balloon

Inflation of angioplasty balloon

(OP)
Hi I'm trying to model the inflation of a simple model of an angioplasty balloon consisting of a straight cylinder with tapered ends to about 4 times the original diameter of the cylinder however I cannot get many of my models to converge and for any that do converge the resulting increase in diameter is minimal. At present I am more concerned with achieving the required deformation for the given geometry than with using accurate material properties. I am currently using Standard but would Explicit be more appropriate? I am inflating the balloon using a pressure load and have constrained all displacements at its ends. Any input you may have would be appreciated. The input file is attached.

RE: Inflation of angioplasty balloon

1. BC-1 which constrains U2 has some extra nodes compared to the other BCs.
2. How accurate is a fixed constraint at the top and bottom?  That is as if it were glued to 2 steel plates.  (I think this is the main issue)
3. Can this be an axi-symmetric model?
I hope this helps.

 

Rob Stupplebeen

RE: Inflation of angioplasty balloon

(OP)
Thanks for your advice I am trying using different bcs. Is there anything I could do with the material model to increase the deformation of the balloon

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