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LIAISON_MAIL shell - solid

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10 years 11 months ago - 10 years 11 months ago #7573 by Comment
LIAISON_MAIL shell - solid was created by Comment
Hello everyone!

Someone know how to properly connect a shell and a solid with Code Aster? A drawing of my part is attached.

For this, I used COQUE_3D and MASSIF_COQUE with elements that I modified with QUAD8_9. The big problem of this approach is that the center nodes created only support rotational DOFs. So, after seeing this message of error, I created a copy of the initial mesh in order to apply QUAD8 elements in the definition of my GROUP_MA_MAIT. Then it was running but singularities appear and the calculation has failed :-(

My next idea is to impose a very small stiffness on the copied elements in order to not affect the results but I am not sure of this and I don't know how to do it...

Is someone has already solved this problem??

Thanks,

Dany

www.dropbox.com/s/6m69k8spp5lsany/Archive.zip
Last edit: 10 years 11 months ago by Comment.
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10 years 11 months ago #7574 by kwou
Replied by kwou on topic Re: LIAISON_MAIL shell - solid
Hoi Dany

I used several types of connection between shells and solids (sometimes with more or less trouble), see:

www.caelinux.org/wiki/index.php/Contrib:...rs/shell/liaisonmail

As far as I know you have to use quad9 elements for coque_3d.

Are the centre nodes part of the interface between shells and solids? Acoording to the *.mess file they are:
Erreur utilisateur:
On cherche à imposer une condition aux limites sur le ddl DX
du noeud NS87.
Mais ce noeud ne porte pas ce ddl.

but if you only select a outer edge (line) of the shell it should be working.

MASSIF_COQUE :
On écrit l'égalité des translations (DX,DY,DZ) du noeud "esclave" (de type "3D") avec
les translations et rotations du point (coque) en vis à vis dans la maille "maitre".
(The translations DX,DY,DZ of the 'slave' nodes (of type 3D) are equal to the translation and
rotation of shell nodes vis-a-vis the 'master" elements)
Interest: structural mechanics, solar energy (picture at 'my location' shows too little pv panels)

--
kind regards - kees
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10 years 11 months ago #7575 by Comment
Replied by Comment on topic Re: LIAISON_MAIL shell - solid
Hi keeswouters!

Thanks for your answer, I already looked at your tuto but I think my problem is different. Thus, I want to connect two faces and not a face with an edge (my drawing shows in fact two cylinders). As I work with faces, the problem comes from the central nodes because they don't allow displacements.

I have seen that COQUE_3D has some trouble with a surface-surface connexion but I don't know how to properly solve it....
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10 years 11 months ago #7583 by Comment
Replied by Comment on topic Re: LIAISON_MAIL shell - solid
So after one day of researches and trials, I still don't found a good manner to solve my problem :( :(

I have done a simple model to explain that I want to do, is someone know how to connect my parts??

I have tried to use DKT elements but other problems appear...

www.dropbox.com/s/6m69k8spp5lsany/Archive.zip
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10 years 11 months ago - 10 years 11 months ago #7585 by RichardS
Replied by RichardS on topic Re: LIAISON_MAIL shell - solid
Hello,
if you want to connect the whole face of a coque_3d element to a solid you have to use a "hack"
which is discribed here: www.code-aster.org/forum2/viewtopic.php?id=18561

Best regards,
Richard
SimScale - Engineering Simulation in your browser!
Last edit: 10 years 11 months ago by RichardS.
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10 years 11 months ago - 10 years 11 months ago #7591 by Comment
Replied by Comment on topic Re: LIAISON_MAIL shell - solid
Hi Richard,

Thanks, so I have followed this "hack" but the result is that I have the same problem described in the end of the post:

< Les .... mailles imprimées ci-dessus n'appartiennent pas au modèle et pourtant elles ont ete affectées dans le mot-clé facteur : LIAISON_MAIL >

And the guys don't explain how they have solved it... :( :(
Last edit: 10 years 11 months ago by Comment.
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