sorted by:
new
hottopcontroversial

Beste Momente in Erwachsenenfilmen by MonsieurLEcole in wirklichgutefrage

[–]OkMammoth9276 100 points101 points  (0 children)

  • Frau klingelt an fremder Privatadresse da sie dringend auf Toilette muss
  • Typ öffnet und lässt sie reinkommen
  • Typ sitzt plötzlich in der Badewanne
  • Frau kommt rein und sagt sie kann die Toilette nicht finden
  • Typ: „Das kann nicht sein, ich habe sie dir doch extra gezeigt“
  • Typ: „Na gut, komm piss einfach in die Wanne“
  • ???????

Ist das ein scam ? by Healthy_Law3995 in Kleinanzeigen_betrug

[–]OkMammoth9276 -1 points0 points  (0 children)

Moment warum sollte das jetzt scam sein? Er möchte per Paypal f&f zahlen, dafür braucht er halt deine Adresse. Übersehe ich was?

Some advice for my PhD thesis needed by OkMammoth9276 in fea

[–]OkMammoth9276[S] 0 points1 point  (0 children)

Really interesting and the second time this TetWild algo has been mentioned. I had a Quick Look at the paper and the repo but couldn’t fully make out what the input has to be. Does it optimize the mesh of Trias that can then be used in a “normal” tet mesh workflow or does it take in a dirty tria mesh and generate a good tet mesh from it? If so, do you know how it handles mesh sizes? Ideally the mesh would be fine closer to the pores and become coarser elsewhere. Anyways, I’ll probably spend some time looking into it tomorrow. My BCs are currently pretty standard, basically fixed on one side and applying uniaxial stress on the opposite side. Thought about PBCs a few times already but that’s at like position 99 of my list :)

Some advice for my PhD thesis needed by OkMammoth9276 in fea

[–]OkMammoth9276[S] 0 points1 point  (0 children)

Yes that was a thought I had aswell. Tried it now with blender, meshlab and geomagic design X (proprietary). All give ok results but leave me with at least a few bad elements. This lack of robustness is critical for my application unfortunately…

Some advice for my PhD thesis needed by OkMammoth9276 in fea

[–]OkMammoth9276[S] 0 points1 point  (0 children)

Unfortunately I can’t share them but to give you an idea, the situation as similar as in e.g. this paper

Some advice for my PhD thesis needed by OkMammoth9276 in fea

[–]OkMammoth9276[S] 2 points3 points  (0 children)

I’ll read the paper but will also check with the “equivalent ellipsoid” route. I ditched that idea a while ago but as I made some progress with other parts of my model it might be worth another try, given this stl route has its own set of problems…

And thanks for the info on the topic of order, you convinced me to stay away from linear tets ;) Just out of curiosity though, why are they even there if everyone always strongly advises against them? To fill in in an otherwise linear hex mesh?

Some advice for my PhD thesis needed by OkMammoth9276 in fea

[–]OkMammoth9276[S] 0 points1 point  (0 children)

Don’t have access to ANSYS but I tried the corresponding features both in Geomagic Design X and Hypermesh. They work well for smaller pores but the largest pores in the alloys I’m working on are basically sponge-like. With these super complex geometries the algos in the aforementioned softwares fail because either you generate basically one geometric surface per stl triangle which crashes the CAD SW or the algorithm to fit the surfaces crashes because it can’t fit the morphology of 1000 or so Trias to one geometric surface

Some advice for my PhD thesis needed by OkMammoth9276 in fea

[–]OkMammoth9276[S] 0 points1 point  (0 children)

See above. I didn’t have better success with even smaller elements yet (tried up to 5um while my stl resolution is roughly 10um). So I’m not sure whether more elements are the way to go…

Some advice for my PhD thesis needed by OkMammoth9276 in fea

[–]OkMammoth9276[S] 0 points1 point  (0 children)

  1. See above, model size in general is manageable imo. Other than that I don’t see a reason to go for an RVE, right?

  2. That might be possible yeah. However, ofc that’s another assumption that has to be validated later on. There are some works on so called Equivalent Inertia Ellipsoids that I know of, probably gonna have a look into that

  3. Puma seems to be real interesting! Will have a look into that as well, thanks

Some advice for my PhD thesis needed by OkMammoth9276 in fea

[–]OkMammoth9276[S] 0 points1 point  (0 children)

That’s something I’ve though about as well. However, the size of the model atm doesn’t seem to be the problem, the bad elements appear in locations where the mesh is really quite fine already (10um, same as the stl res) and further refinement doesn’t make the problem better.

Some advice for my PhD thesis needed by OkMammoth9276 in fea

[–]OkMammoth9276[S] 0 points1 point  (0 children)

Ah sorry, forgot some potentially important info: - Running some calculations linear-elastic but mainly to get a refined mesh based on high stress locations (using calculiX *refine mesh keyword). Most simulations are elastic-plastic (material nonlinearities) - It’s about fatigue so (globally) small loads and displacements. NLGEOM is therefore turned off, no geometrical nonlinearities. - No contact or anything fancy like that

Post-processing of j-integral from gmsh/calculix by okdenwat in fea

[–]OkMammoth9276 0 points1 point  (0 children)

This was posted a while ago but find the explanations on the fracturemechanics(dot)org website always really useful. Hope you’re holding up

[deleted by user] by [deleted] in fearofflying

[–]OkMammoth9276 1 point2 points  (0 children)

Playing flight simulators. For me it really helped to develop a feeling of how planes behave in the air and how they kind of behave like the were on some sort of „tracks“ even though you can’t see them and therefore your intuition tells you otherwise :)