erreur fichier résultat

  • andré
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15 years 1 week ago #397 by andré
erreur fichier résultat was created by andré
Je n'arrive pas à comprendre ce problème,
j'exécute un calculs avec Code Aster et Efficas, mais j'ai cette erreur, je ne la comprend pas :


LA MAILLE MSG PORTE UN ELEMENT FINI DE BORD.
MAIS ELLE NE BORDE AUCUN ELEMENT AYANT UNE \"RIGIDITE\". CELA PEUT ENTRAINER
DES PROBLEMES DE \"PIVOT NUL\" LORS DE LA RESOLUTION.

MATRICE NON FACTORISABLE.
PIVOT VRAIMENT NUL A LA LIGNE 514
NOEUD >N44 < CMP >DX <


quelqu'un a une idée ?!

Merci

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  • joha
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13 years 9 months ago #1363 by joha
Replied by joha on topic Re:erreur fichier résultat
Bonjour Andre,

In Code-Aster there are 1) elements with stiffness (all those which have been declared to be '3D', 'BARRE', 'DKT' or something like this in the command AFFE_MODELE) and 2) elements without stiffness which are automatically interpreted by CA as ELEMENTS Du BORD. ELEMENTS Du BORD serve uniquement for applying loads or contraint onto Your model, selecting for example a GROUP_MA containting elements du bord in a command AFFE_CHAR. elemts Du bord MUST alway be connected to elements with stiffness (otherwise the load onto the e.d.b cannot be transfered to the stiff structure). Example: A 2D-elm du bord uses the 4 nodes of a face of a HEX8 element. Your error message means that one (or more) elements du bord are not connected to the stiff structure.

Look into Your fichier .mess, to the echo of command AFFE_MODELE. I give here an example: All ELEMENT FINI named MECA_BARRE (1 element) or MECA_HEXA8 (80 elements) are stiff elements. All other elements of the maillage (613-80-1=532elements) are elements du bord. They are line-type elements du bord (MECA_ARETE2) or face-type elements du bord (MECA_FACE3, MECA_FACE4). When You use Salome for meshing, Salome creates always automatically a kind of lower dimensional skin elements. That means when meshing a 3D-part Salome will also create a \"skin\" of 2D-elements surrounding completely Your 3D-elements.

Boun success, cordialmente Johannes

#
# COMMANDE NO : 0006 CONCEPT DE TYPE : modele_sdaster
#

FEMLin=AFFE_MODELE(MAILLAGE=MeshLin,
INFO=1,
AFFE=(_F(PHENOMENE='MECANIQUE',
TOUT='OUI',
MODELISATION='3D'),
_F(PHENOMENE='MECANIQUE',
GROUP_MA='Bolt',
MODELISATION='BARRE')),
);


SUR LES 613 MAILLES DU MAILLAGE MeshLin
ON A DEMANDE L'AFFECTATION DE 613
ON A PU EN AFFECTER 613

MODELISATION ELEMENT FINI TYPE MAILLE NOMBRE
3D MECA_ARETE2 SEG2 12
3D MECA_FACE4 QUAD4 4
3D MECA_ARETE2 SEG2 8
3D MECA_FACE4 QUAD4 2
3D MECA_ARETE2 SEG2 3
3D MECA_FACE4 QUAD4 4
3D MECA_ARETE2 SEG2 6
3D MECA_FACE4 QUAD4 18
3D MECA_FACE3 TRIA3 25
3D MECA_FACE4 QUAD4 50
3D MECA_ARETE2 SEG2 29
3D MECA_HEXA8 HEXA8 32
3D MECA_PENTA6 PENTA6 50
3D MECA_HEXA8 HEXA8 8
3D MECA_ARETE2 SEG2 13
3D MECA_FACE3 TRIA3 1
3D MECA_ARETE2 SEG2 3
3D MECA_FACE3 TRIA3 2
3D MECA_ARETE2 SEG2 3
3D MECA_FACE3 TRIA3 2
3D MECA_ARETE2 SEG2 3
3D MECA_FACE4 QUAD4 3
3D MECA_FACE3 TRIA3 2
3D MECA_FACE4 QUAD4 1
3D MECA_ARETE2 SEG2 2
3D MECA_FACE3 TRIA3 4
3D MECA_ARETE2 SEG2 3
3D MECA_FACE3 TRIA3 1
3D MECA_ARETE2 SEG2 3
3D MECA_FACE4 QUAD4 3
3D MECA_ARETE2 SEG2 1
3D MECA_FACE4 QUAD4 2
3D MECA_ARETE2 SEG2 2
3D MECA_FACE4 QUAD4 5
3D MECA_ARETE2 SEG2 3
3D MECA_FACE4 QUAD4 1
3D MECA_ARETE2 SEG2 3
3D MECA_FACE4 QUAD4 4
3D MECA_FACE3 TRIA3 1
3D MECA_FACE4 QUAD4 19
3D MECA_FACE3 TRIA3 3
3D MECA_FACE4 QUAD4 2
3D MECA_FACE3 TRIA3 6
3D MECA_FACE4 QUAD4 3
3D MECA_FACE3 TRIA3 6
3D MECA_FACE4 QUAD4 1
3D MECA_FACE3 TRIA3 4
3D MECA_FACE4 QUAD4 1
3D MECA_FACE3 TRIA3 3
3D MECA_FACE4 QUAD4 1
3D MECA_FACE3 TRIA3 7
3D MECA_FACE4 QUAD4 4
3D MECA_FACE3 TRIA3 1
3D MECA_FACE4 QUAD4 3
3D MECA_FACE3 TRIA3 7
3D MECA_FACE4 QUAD4 45
3D MECA_ARETE2 SEG2 29
3D MECA_HEXA8 HEXA8 32
3D MECA_PENTA6 PENTA6 50
3D MECA_HEXA8 HEXA8 8
3D MECA_ARETE2 SEG2 10
3D MECA_FACE3 TRIA3 12
3D MECA_FACE4 QUAD4 6
3D MECA_FACE3 TRIA3 1
3D MECA_FACE4 QUAD4 10
3D MECA_FACE3 TRIA3 1
3D MECA_FACE4 QUAD4 2
3D MECA_FACE3 TRIA3 3
3D MECA_FACE4 QUAD4 2
3D MECA_FACE3 TRIA3 8
BARRE MECA_BARRE SEG2 1

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