Calculix User Element (Uxxxx)

About the development of the FEM module/workbench.

Moderator: bernd

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Dom
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Joined: Fri Jan 10, 2020 2:52 pm

Calculix User Element (Uxxxx)

Post by Dom » Fri Jan 10, 2020 4:16 pm

Hello,

I’m trying to write a subroutine in Calculix in order to implement a beam elements formulation with a general section (Euler- Bernoulli beam). I need it doing a dynamic analysis.
I have tried to follow the procedure described in CCX manual.
I have written and modified the subroutines:
  • e_c3d_ubml.f
  • resultsmech_ubml.f
  • extrapolate_ubml.f
  • e_c3d_u.f
  • resultsmech_u.f
  • extrapolate_u.f

The eigenvalues that it calculates out are wrong (I'm using Nastran to compare) and the results aren’t in FRD file (in attach there is the model I’m using to check).

I have many difficulties debugging because I don't know the “structure” of the program. For example, I don't know who calls the subroutine e_c3d_u.f?

Has anyone tried to write a subroutine for Calculix?

Is there any document describing the "architecture" of the program?

I'm compiling the program on Linux.

Thanks in advance
Dom
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bernd
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Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland

Re: Calculix User Element (Uxxxx)

Post by bernd » Fri Jan 10, 2020 5:18 pm

you should write to the CalculiX mailing list. There are a lot of people around including Guido Dhondt the main author of the software. See https://groups.yahoo.com/neo/groups/calculix/info

BTW a real beam would be awesome, keep us informed !
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Dom
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Re: Calculix User Element (Uxxxx)

Post by Dom » Fri Jan 10, 2020 7:40 pm

Thanks, Bernd

Just done!

Anyway if in this forum someone has answers, let me know, please.
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Kunda1
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Re: Calculix User Element (Uxxxx)

Post by Kunda1 » Fri Jan 10, 2020 8:39 pm

Dom wrote:
Fri Jan 10, 2020 7:40 pm
Just done!
Is the mailing list archived? Can you post a link to your question for us to track?
Want to contribute back to FC? Checkout:
#lowhangingfruit | Use the Source, Luke. | How to Help FreeCAD | How to report FC bugs and features
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bernd
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Location: Zürich, Switzerland

Re: Calculix User Element (Uxxxx)

Post by bernd » Sat Jan 11, 2020 7:04 am

you need to log in for the archive to read.
UR_
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Re: Calculix User Element (Uxxxx)

Post by UR_ » Sat Jan 11, 2020 7:15 am


Attention: Starting December 14, 2019 Yahoo Groups will no longer host user created content on its sites. New content can no longer be uploaded after October 28, 2019. Sending/Receiving email functionality is not going away, you can continue to communicate via any email client with your group members. Learn More
AFAIK, successor should be found here: https://groups.google.com/forum/#!forum/calculix
but seems to be still empty :(
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Dom
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Re: Calculix User Element (Uxxxx)

Post by Dom » Sat Jan 11, 2020 12:59 pm

I sent an email to calculix@yahoogroups.com, writing my questions.
I hope someone answers me.
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