CAE results interpretation

About the development of the FEM module/workbench.

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aerospaceweeb
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Re: CAE results interpretation

Post by aerospaceweeb »

What software did you use for that truss analysis @theshrader?

I think I'd like to do this with mystran as well.
thschrader
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Re: CAE results interpretation

Post by thschrader »

aerospaceweeb wrote: Sun Oct 24, 2021 8:03 pm What software did you use for that truss analysis @theshrader?

I think I'd like to do this with mystran as well.
FTOOL:
https://www.cesdb.com/ftool.html

EDIT:
here is the statics-file. rename file extension to ftl
mast_ftl.txt
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johnwang
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Re: CAE results interpretation

Post by johnwang »

aerospaceweeb wrote: Sun Oct 24, 2021 8:03 pm I think I'd like to do this with mystran as well.
I have generated a Mystran case file.
Attachments
M1.png
M1.png (20.21 KiB) Viewed 1542 times
HiFrame2D.dat.txt
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hfc series CAE workbenches for FreeCAD (hfcNastran95, hfcMystran, hfcFrame3DD, hfcSU2 and more)
Laurie Hartley
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Re: CAE results interpretation

Post by Laurie Hartley »

taifun wrote: Thu Oct 14, 2021 11:26 am Hi!

I have made this structure (imported step) of S335JO and applied 1000kg force on it. I don't know what to check for and how to figure out if it holds.
Can you guys explain me how should I interpret the results?
taifin - you have come to the right place :) as I found out when I asked a question like yours in a thread that bernd mentioned here;-

Post by bernd » Fri Oct 15, 2021 4:48 pm ( 3rd response to your question on page 1)

Among the posters who have already replied you have posters who "know about" airplane design, concrete structures, steel structures (my favorite subject), and roof trusses and FEA software. Where else would you get that sort of help and advice for free :D

However this is your thread and your question and I think it has the potential to lead us on another fascinating journey into what is (for you and I) the unknown. Lets hope so!

I have a couple of layman's questions start with:-

1. What is stopping the top horizontal members being squashed from a square shape into a diamond shape?
2. Can this tower rotate? or to put it another way "twist" on its vertical axis?

EDIT: One more question:-

3. What is this tower supporting - weight, shape, size?
Jee-Bee
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Re: CAE results interpretation

Post by Jee-Bee »

I hope he the new posts:
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thschrader
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Re: CAE results interpretation

Post by thschrader »

Laurie Hartley wrote: Mon Aug 22, 2022 3:58 am ...
1. What is stopping the top horizontal members being squashed from a square shape into a diamond shape?
2. Can this tower rotate? or to put it another way "twist" on its vertical axis?
EDIT: One more question:-
3. What is this tower supporting - weight, shape, size?
Question 1:
Horizontal stiffeners
Question 2:
Yes. But less with stiffeners.
Question 3:
Foundation missing. However..
Calculating foundation/soil interaction is the job of @HarryvL :)

The future of FEM:
https://forum.freecadweb.org/viewtopic. ... 4&start=30
Calculating 3D-beam structures. Sounds easy. In fact very hard.

I need the capabilities of this, with FC:
http://www.mastan2.com/
Maybe the developer, Professor Ron Zimian, accepts integration in FC.
I am dreaming...

Greetings
Thomas
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NewJoker
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Re: CAE results interpretation

Post by NewJoker »

thschrader wrote: Mon Aug 22, 2022 9:03 pm Calculating 3D-beam structures. Sounds easy. In fact very hard.

I need the capabilities of this, with FC:
http://www.mastan2.com/
Maybe the developer, Professor Ron Zimian, accepts integration in FC.
I am dreaming...
It’s a FEM paradox - beam elements were developed first and yet up to this day there’s no user-friendly, complete and reliable open-source environment for calculations of beam and frame structures. It’s even hard to find anything for plane frames for free. The same applies to kinematic analyses of simple linkages but in this case, it’s even worse.
Laurie Hartley
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Re: CAE results interpretation

Post by Laurie Hartley »

thschrader wrote: Mon Aug 22, 2022 9:03 pm
Laurie Hartley wrote: Mon Aug 22, 2022 3:58 am ...
1. What is stopping the top horizontal members being squashed from a square shape into a diamond shape?
2. Can this tower rotate? or to put it another way "twist" on its vertical axis?
EDIT: One more question:-
3. What is this tower supporting - weight, shape, size?
Question 1:
Horizontal stiffeners
Question 2:
Yes. But less with stiffeners.
Question 3:
Foundation missing. However..
Calculating foundation/soil interaction is the job of @HarryvL :)
I must admit Thomas with my limited understanding of this subject, I have been struggling to come to terms with the answer to question 1. So much so that I conducted a little experiment with a card board box and a book. Am I going mad ? :lol: - I know what is coming. :)
https://www.dropbox.com/s/h6fia7vaqh9c1 ... 1.mov?dl=0

Cheers
Laurie
thschrader
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Re: CAE results interpretation

Post by thschrader »

Laurie Hartley wrote: Fri Aug 26, 2022 7:08 am ... that I conducted a little experiment with a card board box and a book.
Thanks for the video.
Add a stiffener-cross to reduce deformation/warping.
book_with_cube.FCStd
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stiffener_test.JPG
stiffener_test.JPG (88.11 KiB) Viewed 1260 times
Laurie Hartley
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Re: CAE results interpretation

Post by Laurie Hartley »

thschrader wrote: Fri Aug 26, 2022 9:40 am
Laurie Hartley wrote: Fri Aug 26, 2022 7:08 am ... that I conducted a little experiment with a card board box and a book.
Thanks for the video.
Add a stiffener-cross to reduce deformation/warping.
book_with_cube.FCStd
stiffener_test.JPG
Ah Thomas I misunderstood your original answer :oops: your latest answer is what I thought is required (I call stiffeners “braces”).
Thanks
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