stent crimping of nitinol quarter model abaqus
stent crimping of nitinol quarter model abaqus
(OP)
Hi i'm modelling possible frames for anchorage in valve prostheses ( larger stents) made out of nitinol and im exploiting symmetry by modelling only a quarter of both the cylindrical crimptool and the stent. Howwever, when i do so by imposing radial BC's on a reference point mapped to the crimptool nodes via an equation constraint the ends of the stent fold in and im pretty sure ive got suitable BC's (also the Reaction force output is high and noisy)
can anyone help me out?
can anyone help me out?
RE: stent crimping of nitinol quarter model abaqus
RE: stent crimping of nitinol quarter model abaqus
RE: stent crimping of nitinol quarter model abaqus
RE: stent crimping of nitinol quarter model abaqus
could you think of any other reasons? would sharing an inp help?
RE: stent crimping of nitinol quarter model abaqus
RE: stent crimping of nitinol quarter model abaqus
Link
The first link shows the newer design inp which i created to reduce regional stress concentrations but doesnt seem to be doing so and the second one is an older design where it ran pretty ok. the problem is it is quite noisy, has high stress concentrations and most importantly the RF values im getting are too high especially for the new design.
RE: stent crimping of nitinol quarter model abaqus
"C:\Josh_Abaqus\RF-crimp-models\12-copy-shell\continuos-strut-design\thickness030newmesh.inp"
I cant seem to attach the links so that you can open them . is there a way to do so on this?
RE: stent crimping of nitinol quarter model abaqus
RE: stent crimping of nitinol quarter model abaqus
RE: stent crimping of nitinol quarter model abaqus
RE: stent crimping of nitinol quarter model abaqus
this picture shows the folding in of the ends of the struts i have referenced as well as the high von mises stress values.
RE: stent crimping of nitinol quarter model abaqus
- you are using fixed incrementation within a dynamic explicit step - is there a reason for it ? The use of automatic incrementation is advised in the majority of cases.
- your general contact domain is limited to one selected surface pair - it's not wrong but make sure that no other contact (like self contact) can occur in this case
- did you check the global energies in the model ? Do they all look correct ? Also, I've noticed that you limited the energy output to just two energies. It would be good to include other types as well - for verification purposes. In Abaqus/Explicit analyses it's really important.
- if you encounter some noise in results, consider increasing output frequency or using built-in filters
- prescribed velocity (with smooth step amplitude) might be better than prescribed displacement in the case of Abaqus/Explicit analysis
RE: stent crimping of nitinol quarter model abaqus
RE: stent crimping of nitinol quarter model abaqus
RE: stent crimping of nitinol quarter model abaqus