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  • Users: ryankb
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  1. ryankb

    *SUPERELASTIC nitinol built-in definitions

    I am working on transitioning over to the built-in *Superelastic definitions of nitinol in Abaqus, and at the same time working to include plasticity (new model requires very high strains). I'm having a rough time including the Material Hardening and Material Hardening Modifications. I built a...
  2. ryankb

    Dual varying linear pattern help!!

    I'm stuck. What I'm trying to do doesn't seem that difficult logically, but I simply cannot get the software to make it happen - and I really don't want to have to manually edit a TON of dimensions. It's a plate with holes. The holes are actually small round-ended slots. I want to do three...
  3. ryankb

    Import analysis issues - stresses dropping rapidly

    Hello all, I'm hoping someone can shed some light into an issue I've been having this week. I'm running Abaqus explicit, a nitinol product is hitting a wall. Nitinol is modeled as beam elements, wall is solid elements. I think something with the restart isn't quite working properly, because in...
  4. ryankb

    Contact interaction not working for restart/import file

    I'm working on an explicit model, nitinol mesh inside a tube. I've completed the loading process in a previous analysis, and now I'm using it for the base of an import model to continue the analysis and release it against a piece of rubber. So, I've successfully brought everything in, ran it...
  5. ryankb

    Explicit Displacement B.C. after anneal step

    I'm running a nitinol explicit simulation using displacement B.C.'s to do the heat setting procedure. I'm doing a multi-step process, so I have an anneal step in the middle. This is causing me difficulties with my B.C.'s however. Say I want to displace by 2mm. In the B.C. definition, for Step1...
  6. ryankb

    stent wire / expansion surface contact problems

    I'm having some difficulty defining contact/interaction between my stent and expansion cylinder (wire stent). I'm not getting what I'm expecting from my results. It is running to completion without errors, but when viewing the results, it looks like my surface is interacting with the actual...
  7. ryankb

    Using Plasticity definitions in Nitinol UMAT - finding some interesting problems

    I've been noticing some really odd problems with the nitinol material definitions when trying to use plasticity. I attached my model, but I'll describe it as well. I have a simple stent structure going through a 3 stage expansion with anneal/crimp/deploy/load. During the crimp step it sees very...
  8. ryankb

    Instability fixes for NiTi stent

    I've made a whole lot of progress this past week on my stent analysis. I have it effectively going through a three-step expansion/annealing procedure before a crimp - but now the best I can do is about 61% of the way through the crimp step. Abaqus standard procedure. I think that I'm seeing some...
  9. ryankb

    Stent forces simulation

    I've seen a few other threads on here about how to calculate the reaction forces on a nitinol stent - but I think I'm missing something (I've never been great at post-processing navigation in Abaqus). I have a simple nitinol stent. Expanded out, annealed, then crimped. I want to create a plot...
  10. ryankb

    ABAQUS stent analysis failing

    I'm having some difficulty running a stent analysis and I'm hoping there might be some expertise here that can help me out. I just got done taking the online stent simulation tutorial from Simulia, and now I'm working to extrapolate on my own practice. I have a very simple laser-cut style 8-...

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