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#1 2021-07-20 14:23:51

adriaan
Member
Registered: 2020-07-14
Posts: 12

Error with nodal forces when constructing St Venant's principle

Hi everyone

I am trying to create a study where I can demonstrate St Venant's principle. I am replicating an article by  Özcan Somuncu who does it in Ansys.

When I run the simulation, I get the error:

Erreur utilisateur :                                                             
   !   Vous voulez imposer une force selon la composante FY sur un ensemble de noeuds,
   !   mais cette composante de force n'existe sur aucun de ces noeuds.

I

I do not understand the error. I want to impose a force on the nodes and that I why I have added FORCE_NODALE. Do I need to specify the force somewhere else as well?

Thanks for the help!

Last edited by adriaan (2021-07-20 14:27:22)


Attachments:
saint-venant-principle.zip, Size: 46.28 KiB, Downloads: 52

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#2 2021-07-20 14:53:27

jlf
Member
Registered: 2007-11-22
Posts: 255

Re: Error with nodal forces when constructing St Venant's principle

Hi,

If you read your "mess" file
║ <A> <MODELISA8_11>
║ Le noeud N1732 est orphelin.
║ This is a warning. If you do not understand the meaning of this
║  warning, you can obtain unexpected results!

║ <A> <MODELISA4_6>
║ - > Phase of checking of the mesh: presence of orphan nodes.
║  The orphan nodes are nodes which do not belong to any mesh.
║ This is a warning. If you do not understand the meaning of this
║  warning, you can obtain unexpected results!

And N1732 is in RIGHT_NODES ==> Plouf.

N1732 is not attach at a mesh ==> no DoF on it

JLF

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#3 2021-07-20 15:17:24

adriaan
Member
Registered: 2020-07-14
Posts: 12

Re: Error with nodal forces when constructing St Venant's principle

Thanks for the quick reply.

How do you attach it to the mesh? I added the nodes as part of groups together with the .med file, so I thought they would be included with the mesh?

Thanks

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#4 2021-07-20 17:56:22

jlf
Member
Registered: 2007-11-22
Posts: 255

Re: Error with nodal forces when constructing St Venant's principle

Hi,

The node is in the mesh, but is not a node of a DKT element.
You MUST define your RIGHT_NODES with nodes belonging to DKT elements.

JLF

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