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by shIxx
Sun Dec 08, 2019 12:55 pm
Forum: Forum in Deutsch
Topic: Assembly 3, ein erster Einblick
Replies: 84
Views: 3881

Re: Assembly 3, ein erster Einblick

Danke erstmal für die ausführliche Antwort. Performanz ist sehr gut, allerdings nutze ich keine Assembly-Constraints, sondern positioniere die Bauelemente nur (sehr oft mit hinterlegten Formeln) und fasse sie mit dem Assembly Container in Gruppen zusammen, die dann als Einheit "bewegt" werden können...
by shIxx
Tue Dec 03, 2019 2:32 pm
Forum: Forum in Deutsch
Topic: Assembly 3, ein erster Einblick
Replies: 84
Views: 3881

Re: Assembly 3, ein erster Einblick

Hallo an alle hier im Forum, mir ist aufgefallen das sich ASM3 sehr oft wandelt so das man alte Assemby's nach einigen Versionen nicht mehr öffnen kann. Generell tut sich zur Zeit anscheinend sehr viel in diesem Berreich: A2+, ASM3, ASM4 und es gibt ja noch das gute alte Assembly 2. Ich hab da kaum ...
by shIxx
Thu Oct 17, 2019 7:05 pm
Forum: FEM
Topic: Topology optimization
Replies: 83
Views: 23701

Re: Topology optimization

I’m not sure if it is intended workbenchworkflow but dirty way can be to define another cube, shift it to overlap original geometry a bit and than define a new material on the cube (which has nothing to do with a mesh object). I have tried this way but callculix is giving an error. Apparently, all ...
by shIxx
Mon Sep 30, 2019 2:46 pm
Forum: FEM
Topic: Topology optimization
Replies: 83
Views: 23701

Re: Topology optimization

It is possible to define second material in FreeCAD for top flange and not include it to the optimization domain or define it as the non-design domain. Thanks, I didn't know that. That means I need a model with at least two materials but if I try to add a different material to a surface, CalculiX s...
by shIxx
Mon Sep 30, 2019 8:20 am
Forum: FEM
Topic: Topology optimization
Replies: 83
Views: 23701

Re: Topology optimization

I wonder if Z88 Arion's comparatively simpler output is a measure of how effective it is or too simplistic a calculation. Beso only has the ability to optimize for stiffness, this is why I've used the CO solver in Arion which does very fast iterations based on stiffness. Maybe it would have been be...
by shIxx
Sat Sep 28, 2019 2:16 pm
Forum: FEM
Topic: Topology optimization
Replies: 83
Views: 23701

Re: Topology optimization

Here is another comparison.
Von Mises stress [MPa] original and optimized relatively well spread:
by shIxx
Sat Sep 28, 2019 11:20 am
Forum: FEM
Topic: Topology optimization
Replies: 83
Views: 23701

Re: Topology optimization

Thank you for this great work. I know topology optimization is hard to compare, but I dared try it. beso vs z88Arion vs Ansys,.. Unfortunately I had to exclude ToOptix because I work with FreeCAD .19 and python 3 I used the same mesh on all three solvers. The mesh was generated by Netgen from the FE...
by shIxx
Thu Sep 12, 2019 12:45 pm
Forum: FEM
Topic: Multi Material Tutorial
Replies: 9
Views: 759

Re: Multi Material Tutorial

sry for the double posts but I have repeated the analysis with Netgen and it looks like Netgen does support multiple materials from now on *thumbs up* :D
I think this was not possible in .17, but it seems it is implemented now in .18.
by shIxx
Thu Sep 12, 2019 12:30 pm
Forum: FEM
Topic: Multi Material Tutorial
Replies: 9
Views: 759

Re: Multi Material Tutorial

I found a very important comment on the video I posted above. I translated this comment in English for all English-speaking people here (by google translate): With several materials with different E-modules, the stress evaluation at the contact surfaces is wrong! This is because in the FEM method, f...
by shIxx
Thu Sep 12, 2019 11:03 am
Forum: FEM
Topic: Multi Material Tutorial
Replies: 9
Views: 759

Re: Multi Material Tutorial

I attached the .FCStd as well without the mesh for smaler file size Edit: BTW if you want the axle to go through the wheels, than you have to cut the axle out of the wheels. This should also work. In summary, it can be said that its important to: - have no overlapping geometries! - use compsolid ins...

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