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  1. pradeepburla

    Inflation of 3 tryton balloon

    Hi Guys, I generated Tryton balloon geometry and meshed them with shell elements. I am using Abaqus/Explicit to inflate the balloon. I am applying uniform pressure to the internal walls of the balloon with a linear amplitude curve from 0-1. E=920 MPA Poisson Ratio=0.4 I see a recoiling...
  2. pradeepburla

    Expansion of Stent

    Hi Dave , You were bang on when you recommended inclusion of elasto plastic material model.Now my model works even for a General,Static which didnot earlier. You are also right regarding modelling of the baloo0n .I modeled a 3 fold baloon and ran a couple of simulations.That works fine as well...
  3. pradeepburla

    Expansion of Stent

    @IceBreakerSours General,static didn't work as it failed to converge as it needed smaller time steps<1e-10. I changed the material properties of the Stent to elasto plastic but i still have some issues. @Dave Exactly.With a simple baloon i meant cylindrical shell with a diameter lower that the...
  4. pradeepburla

    Expansion of Stent

    Thanks Dave , Instead of D4R elements for radial displacement it makes sense to use rigid surface if I do not care about baloon. I modeled stent geometry from the actual stent but I have not modeled 3 fold baloon or 6 fold baloon, I am just working with a normal cylindrical baloon.I would like...
  5. pradeepburla

    Expansion of Stent

    Thanks Dave for the elaborate reply :). 1.I am using a Co-Cr alloy based stent and i just wanted to first run it for elastic case and then include plasticity. 2.I actually completed the baloon,stent and artery analysis by prescribing radial displacement to the baloon.It didnot work with static...
  6. pradeepburla

    Expansion of Stent

    Another doubt I have is in the link I attached(Section 2.3-Boundary and loading conditions) he says he applied increasing uniform pressure from 0-1.5MPA .When I apply the same to my baloon I get a radial displacement of 22micrometers but according to the paper he gets a radial displacement of...
  7. pradeepburla

    Expansion of Stent

    When I looked for material properties of stent and baloon I guess the values I found were prety consistent. Baloon - Y=920 MPA Stent - Y=203 GPA Reference Link
  8. pradeepburla

    Expansion of Stent

    Hello, I will try to be as concise as possible :). I am working on stent expansion using a baloon ,all the units I mention below will be based on N/(micrometer)**2. So initially I expanded my stent by giving radial displacement boundary condition to the baloon ande i could achieve uniform...
  9. pradeepburla

    Warp feature in CREO

    Hi Guys, I want to bend the solid into a cylinder.So i use the warp feature in creo but I am not able to achieve the bend completely. I am attaching the screenshots .Basically I would like the bend to be complete by ending where it started. Link Link Thanks in advance...
  10. pradeepburla

    UEL in ABAQUS

    INput filehttp://files.engineering.com/getfile.aspx?folder=1f665ae3-dba9-4b5b-ba9b-41cffce4fbcc&file=INP_Diffusion.inp
  11. pradeepburla

    UEL in ABAQUS

    Hi Everyone, I want to write a thermo mechanical and chemically coupled user element in ABAQUS. I started off by writing my diffusion element.I tried to print my U vector which is the solution vector. I donot see my boundary condition in the U vector. In feap I wrote my user elements where if I...
  12. pradeepburla

    Boundary condition problem

    Thank You for the reply and solution.
  13. pradeepburla

    Boundary condition problem

    Hi Guys, I hav a block of cube and on the top of the surface I prescribe some concentration.After a while the concentration on the top surface should reduce as some part of the concentration has gone down inside the cube.This is similar to saying I heat the top surface of the cube to 100...
  14. pradeepburla

    Modelling change in volume of element

    Thank You for the reply. I will have a look.
  15. pradeepburla

    Modelling change in volume of element

    Hi guys, I want to model a bio degradable material whose volume changes with time. It should somehow delete the elements on the top layer of the surface with change in time. is it possible to create such a model in any software?if not how can i create my model right from scratch.Any advice is...
  16. pradeepburla

    compression of cylinder

    I solved the problem using your suggestion to use Cylindrical coordinate system and contrain z and theta leaving the radial dof free. Thanks a lot DrBwts,Mustaine3 and cooken .
  17. pradeepburla

    compression of cylinder

    Hello, I have a small problem where I have to compress the cylinder. For example if I have a cylinder of diametrer 1 cm ,I want to reduce the diameter of the cylinder to 0.5cm.I donot mind even if the length of cylinder increases. I cannot constraint any face of the cylinder as I want size...
  18. pradeepburla

    Bubble function and Enhanced Strain methods

    Can anyone give me a good headstart into the following topics, 1.Incompatible modes method(Bubble functions) 2.Enhanced strain Method I was going through the topic shear locking and found out that there are these methods which solve the locking problem but didnot find the solution intuitive.If...
  19. pradeepburla

    Incompatible modes and enhanced strain methods

    Can anyone give me a good headstart into the following topics, 1.Incompatible modes method(Bubble functions) 2.Enhanced strain Method I was going through the topic shear locking and found out that there are these methods which solve the locking problem but didnot find the solution intuitive.If...

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