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Torsion problem with ASTER

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15 years 6 months ago #3569 by JamesD
Replied by JamesD on topic Re:Torsion problem with ASTER
I am looking to apply a moment on a cylinder. I have so far created a model and meshed it, I then added a node in the center of the top of the cylinder and then connected this node to 4 other nodes on the top surface of the cylinder which are in a group of nodes. I am now attempting to use Eficas to apply the moment to the node using force_nodale and apply the force to My.

I have been trying to piece together several examples but I do not understand what commands I should use to link the created node back to the model so that it transfers the moment. I am getting <F> Copy_Error is this because I need to create a new mesh for the node?


Any help would be really appreciated.

James
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15 years 6 months ago #3578 by Andre
Replied by Andre on topic Re:Torsion problem with ASTER
Hello James,

What is the error message in the .erre file ?

regards

Andre
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15 years 6 months ago #3587 by JamesD
Replied by JamesD on topic Re:Torsion problem with ASTER
Hi Andre

Sorry for the late reply. I don't have a .erre file or at least I can't find one.

I'm trying to follow the three examples that Claus posted. What I'm struggling with is understanding the relationships created between faces/nodes etc and how to apply them to different models. Basically what the rules are concerning them!

Regards

James
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12 years 2 months ago - 12 years 2 months ago #6687 by Nelson Carvalho
Replied by Nelson Carvalho on topic Re:Torsion problem with ASTER

Claus wrote: Another one

Post edited by: Claus, at: 2009/06/20 12:58

Won't attach - give the previous post a try<br /><br />Post edited by: Claus, at: 2009/06/20 12:58


Hello,

I know that a loong time has passed,but, is there any sinal of these files that you've attached ? rigid_element and tube ?

I will do your tutorial : www.caelinux.org/wiki/index.php/Contrib:...er/10_x_cases/torque
But if they still exist, could become usefull.

I will need to apply torsion to a cylinder.

After these years, this is still the only way to do it?

Best Regards.
Last edit: 12 years 2 months ago by Nelson Carvalho.
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12 years 2 months ago #6688 by Claus
Replied by Claus on topic Re:Torsion problem with ASTER
Yup - found the file in question.

If the way I describe is still the most proper way to induce torque in a model, I don't know - there has been some developments since then: www.code-aster.org/forum2/viewtopic.php?id=15029

Search for RBE3 here
www.code-aster.org/documents/histor/en/11.1.13.txt

Which of these are best, I am not qualified to answer - but my guess is RBE3 - you should be able to use that while following my tutorial :)

Let me know how it goes - some of those tutorial are due for an update.

/C

Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version
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12 years 2 months ago #6695 by kwou
Replied by kwou on topic Re:Torsion problem with ASTER
Hoi Caelinuxers,

see also this topic:
www.code-aster.org/forum2/viewtopic.php?id=18439

At the moment I am using the RBE3 constraint for testing a torsion beam.
I will put it on the wiki soon.

Interest: structural mechanics, solar energy (picture at 'my location' shows too little pv panels)

--
kind regards - kees
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