Search found 333 matches

by Roland
Tue Jan 04, 2022 3:52 pm
Forum: FEM
Topic: My FEM fails. How to get further?
Replies: 8
Views: 2101

Re: My FEM fails. How to get further?

Horrible! I cannot confirm that my diagnosis of the reason for failure is correct.

The solution works anyway!

Roland
by Roland
Tue Jan 04, 2022 3:27 pm
Forum: FEM
Topic: My FEM fails. How to get further?
Replies: 8
Views: 2101

Re: My FEM fails. How to get further?

BINGO!

Problem solved.
.
Bearing1_Shells.png
Bearing1_Shells.png (146.08 KiB) Viewed 1804 times
How? Perhaps:
.
Bearing_FEM.png
Bearing_FEM.png (92.23 KiB) Viewed 1804 times
.

I shall appreciate your view of cause and solution.

Greetz

Roland
by Roland
Tue Jan 04, 2022 1:59 pm
Forum: FEM
Topic: My FEM fails. How to get further?
Replies: 8
Views: 2101

Re: My FEM fails. How to get further?

Thanks Alex. 1/ I never used Facebinder. I made those models by Part Fuse (accepting the warning against fusing faces). Upon using Facebinder for the first time I observe that Facebinder does not include some of the shells into the created item. Does this tell me something about the quality of wheth...
by Roland
Tue Jan 04, 2022 11:44 am
Forum: FEM
Topic: My FEM fails. How to get further?
Replies: 8
Views: 2101

Re: My FEM fails. How to get further?

1/ Thanks NewJoker. Can go ahead with your suggestions 2/ Bernd: I posted in the Users forum because I asked for help on usage. I do not see my novice level questions as assisting to FEM Development. But I am glad that my question was noticed. In the near future, all usage questions regarding FEM to...
by Roland
Tue Jan 04, 2022 12:27 am
Forum: FEM
Topic: My FEM fails. How to get further?
Replies: 8
Views: 2101

My FEM fails. How to get further?

Dear FEM experts, I feel a novice in FEM. This is my model: Bearing1_Original.png I want to analyse its strength if an axis (purple) is placed as indicaded and presses downward. I prepared two approaches, of which none succeeded so far. The one based on shells fails with a CalculiX execution error: ...
by Roland
Thu Dec 30, 2021 11:07 am
Forum: FEM
Topic: Torque + Force
Replies: 10
Views: 2603

Re: Torque + Force

NewJoker wrote: Wed Dec 29, 2021 1:36 pm To post-process your results in ParaView you just have to export them to vtk format (FreeCAD offers such an option). Then you will be able to import them directly to ParaView.
Found the option: Select CCX_Results. Menu/File/Export/*.vtk

Thanks!
by Roland
Thu Dec 30, 2021 10:25 am
Forum: FEM
Topic: Torque + Force
Replies: 10
Views: 2603

Re: Torque + Force

user1234 wrote: Thu Dec 30, 2021 4:51 am in more instances and angles,
Thanks, User. Actually I did that like so:
.
MoreInstances&Angles.png
MoreInstances&Angles.png (19.04 KiB) Viewed 1679 times

This FEM evaluation gives a 14% larger sheer stress than an analytical solution. For the purpose of my analysis this is OK.

Best wishes,

Roland
by Roland
Wed Dec 29, 2021 11:06 am
Forum: FEM
Topic: Torque + Force
Replies: 10
Views: 2603

Re: Torque + Force

That 's a nice result New Joker. Thanks! Which file should Paraview open to evaluate the results in that viewer? I tried a few, but so far I failed. I made a comparison with an analytical approach. I split the problem into 2. 1/ Bending of the beam and 2/ Torquing the beam. I developed analytical so...
by Roland
Tue Dec 28, 2021 12:14 am
Forum: FEM
Topic: Torque + Force
Replies: 10
Views: 2603

Re: Torque + Force

The beam is a standard hollow cross section of 120x120x10 mm. Length 1000 m. I shall gladly share the model with you, and greatly appreciate if you could make a check. I am not familiar with the CalculiX tools that you proposed. My analytical skills are limited approaches learned 40 years ago, and f...
by Roland
Mon Dec 27, 2021 10:05 pm
Forum: FEM
Topic: Torque + Force
Replies: 10
Views: 2603

Re: Torque + Force

Thanks NewJoker, I did find an approach that is executed by FEM WB, and perhaps gives a sufficiently reliable result. (that should be evaluated some way or another, and perhaps also looked at from the perspective that you just sketched here above). My process was as follows: I defined the beam as a ...