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#1 2016-09-13 06:24:33

konyaro
Member
From: Genève
Registered: 2016-04-02
Posts: 262

[SOLVED] SANS_GROUP_NO: can't make it work

Hello,
I'm trying to use the option SANS_GROUP_NO in a contact definition but it seems to have no effect. In the simple attached example I try to remove the 5 common nodes of the 2 slaves but it doesn't work:

! Les zones de contact numéro 1 et numéro 2 ont 5 noeuds communs à leurs surfaces !
! esclaves : c'est interdit.

Any idea? Thank you

Last edited by konyaro (2016-09-14 05:47:54)


Attachments:
sans_group_no.zip, Size: 31.88 KiB, Downloads: 256

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#2 2016-09-13 19:51:23

AsterO'dactyle
Administrator
Registered: 2007-11-29
Posts: 386

Re: [SOLVED] SANS_GROUP_NO: can't make it work

Hello,

SANS_GROUP_NO doen't work in this case, sorry.

You should (re) define your groups


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#3 2016-09-14 05:47:42

konyaro
Member
From: Genève
Registered: 2016-04-02
Posts: 262

Re: [SOLVED] SANS_GROUP_NO: can't make it work

Thank you for your answer.
In this case I can indeed easily redefine the groups but in more complicated models this function would be very useful. I didn’t understand in which case this function works but I got my answer for my case therefore I close the topic.

Meilleures salutations,

K.


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#4 2016-09-14 08:28:22

jeanpierreaubry
Guru
From: nantes (france)
Registered: 2009-03-12
Posts: 3,653

Re: [SOLVED] SANS_GROUP_NO: can't make it work

hello

i have some difficulty to understand what you are trying to do
with contact surfaces being inside of a single solid body

jean pierre aubry

EDIT
i understand the point above
though i would have split the single volume into two volumes to makes things clearer

SANS_GROUP_NO applies if you have common nodes between surface 1 and surface 2 of a contact definition (for examples s2 and m12 in this case)
here this does not happens

what happens here (and the msg is very clear about that) is that you have 5 common nodes between the slave surfaces (s1 and s2) of contact 1 and 2 as you have defined two different contact zone



   ! <EXCEPTION> <CONTACT2_16>                                                                                  !
   !                                                                                                            !
   ! Contact formulation continue.                                                                              !
   ! Les zones de contact numéro 1 et numéro 2 ont 5 noeuds communs à leurs surfaces esclaves : c'est interdit. !
   ! Conseil :                                                                                                  !
   !  - changez vos surfaces de contact.  

Last edited by jeanpierreaubry (2016-09-14 09:00:38)


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freely available here https://framabook.org/beginning-with-code_aster/

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#5 2016-09-14 09:17:11

konyaro
Member
From: Genève
Registered: 2016-04-02
Posts: 262

Re: [SOLVED] SANS_GROUP_NO: can't make it work

Hello Jean-Pierre, thank you for your answer.
you are right, it's a stupid example. I just wanted to point out in a simple model that SANS_GROUP_NO doesn't seem to work in some cases. My real problem is the following:

- 2 slave surfaces on the same surface divided into 2 surfaces (cf. picture)
- 2 masters on 2 different parts

It's possible of course to change the groups but it would be much easier to use 2 adjacent surfaces and to exclude the common nodes with SANS_GROUP_NO.

I guess you are right, SANS_GROUP_NO excludes only the master nodes from the slave ones.

Excellente journée,

K.


Attachments:
example.PNG, Size: 42.22 KiB, Downloads: 257

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#6 2016-09-14 17:57:13

AsterO'dactyle
Administrator
Registered: 2007-11-29
Posts: 386

Re: [SOLVED] SANS_GROUP_NO: can't make it work

Hello,

I have emitted an issue in our bugtracker to enhance that. That is not very practical


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#7 2016-09-15 05:50:14

konyaro
Member
From: Genève
Registered: 2016-04-02
Posts: 262

Re: [SOLVED] SANS_GROUP_NO: can't make it work

Thank you AsterO'dactyle !


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