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#1 2017-02-27 10:19:02

PATCH
Member
From: Brno, Czech Republic
Registered: 2017-01-03
Posts: 28

Beam internal note FORC_NODA

Hi.

I have a question about plotting or printing nodal forces of internal node. For example i have a beam fixed on one side a loaded with axial force on the other side.

I can obtain forces in ending nodes (node of applied boundary conditions) but I can not get forces of internal nodes. I understand that numerically there has to be zero force to comply force equilibrium because node belongs to adjoining elements.

Can I somehow select element and then obtain forces of this node? Now it will not be zero. On one of the adjoined elements forces will be positive and on the other one they will be negative.

Is there some way how to do it? I was doing this ANSYS APDL so I know it is possible.

Michal

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#2 2017-02-27 13:56:27

jeanpierreaubry
Guru
From: nantes (france)
Registered: 2009-03-12
Posts: 3,975

Re: Beam internal note FORC_NODA

hello

this is the field SIEF_ELNO
giving N, VY, VZ, Mt, MFY, MFZ et every end node of the beam element

jean pierre aubry

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

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#3 2017-02-27 14:40:35

PATCH
Member
From: Brno, Czech Republic
Registered: 2017-01-03
Posts: 28

Re: Beam internal note FORC_NODA

I am not able to get results uisng SIEF_ELNO, I do not know how to plot results in ParaVIS. But I have done it different way. I have read documentation of CALC_CHAMP again and I have found in section 2.9.1 Operand FORCE, Noteice 2. It says:

If the keyword GROUP_MA is informed, the options «FORC_NODA» and ' REAC_NODA ' are computed as follows: Fk is only computed on the elements requested then assembled. The result is different from a global computation on all the field then reduced to the required elements. The established method allows to gauge the reaction of a part of model on another.

This solved my problem of getting results. But still do not know how to do it using SIEF_ELNO and N, VY, VZ, Mt, MFY, MFZ.

Michal

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#4 2017-02-27 16:43:55

jeanpierreaubry
Guru
From: nantes (france)
Registered: 2009-03-12
Posts: 3,975

Re: Beam internal note FORC_NODA

i do not understand how you know how to calculate FORC_NODA with CALC_CHAMP and not SIEF_ELNO
this is rock bottom basic of Code_Aster