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#1 2022-11-23 09:38:13

jacob
Member
From: Dolní Benešov
Registered: 2022-03-07
Posts: 89

meaning of FACE_IMPO DTAN

Hello,
could anybody clarify when to use FACE_IMPO DTAN?

"Used to apply a boundary condition in the tangent direction to the face (see Section 6.18.3.9.1). We thus modify the values of the displacement degrees of freedom DX, DY and DZ. This condition can work only in 2D, not in 3D."

What does it mean 2D? I tried everything but nothing works.

║ <EXCEPTION> <CHARGES2_63>                                                                      ║
║                                                                                                ║
║ Vous ne pouvez pas bloquer le déplacement tangent sur des faces d'éléments 3D.                 ║
║  Utiliser                                                                                      ║
║ DDL_IMPO ou LIAISON_DDL.

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#2 2022-11-23 14:11:45

AsterO'dactyle
Administrator
Registered: 2007-11-29
Posts: 438

Re: meaning of FACE_IMPO DTAN

Hello,

MODELISATION='C_PLAN', 'D_PLAN', 'AXIS' => 2D (skin element are edges)

DTAN is only one value. You must have two in 3D (skin elements are 2D) => you cannot use DTAN is MODELISAITON='3D'


Code_Asterの開発者

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#3 2022-11-23 20:10:56

jacob
Member
From: Dolní Benešov
Registered: 2022-03-07
Posts: 89

Re: meaning of FACE_IMPO DTAN

Thanks for answer.

But I thought that  DTAN in ARETE_IMPO is for SEG2, SEG3 elements. FACE should be surface elements, shouldn't?

Then, how to lock DTAN displacement for solid in 3D, even if it would be both directions?
If DNOR is possible it shouldn't be problem to compute arbitrary 2 orthogonal directions to complete the base.

Last edited by jacob (2022-11-23 20:14:28)

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