#1 2022-12-10 12:42:48

EnKiNekiDela

Member

From: Slovenija

Registered: 2021-11-07

Posts: 24

Unknown operator: LIAISON_SOLIDE_SPH

Dear colleagues,

This is a strange one!
During my endeavors to speed up calculations at friction between rigid bodies I tried also with the help of OpenAI GPT.

The task is as follows:
Simulate the time-history response of a spherical friction joint with a specified radius between only two nodes in CODE_ASTER.

Proposed code by OpenAI GPT for this task is:

! Define the two bodies involved in the friction joint
DEFI_GROUP(reuse=BODY_1,
           MAILLAGE=mesh_body_1,
           CREA_GROUP_MA=_F(
               OPERATION='ASSOCIE',
               TYPE_GROUP_MA='MAILLE'
           ))

DEFI_GROUP(reuse=BODY_2,
           MAILLAGE=mesh_body_2,
           CREA_GROUP_MA=_F(
               OPERATION='ASSOCIE',
               TYPE_GROUP_MA='MAILLE'
           ))

! Define the contact between the two bodies
LIAISON_SOLIDE_SPH(reuse=CONTACT,
                   TYPE_LIAISON='FROTTEMENT',
                   GROUP_MA_1=BODY_1,
                   GROUP_MA_2=BODY_2,
                   NOEUD_1=node_1,
                   NOEUD_2=node_2,
                   RAYON=joint_radius,
                   COEF_FROTTEMENT=0.3)

! Apply a time-varying load to the bodies and simulate the time-history response of the friction joint
IMPR_FONC_MULT(reuse=LOAD,
               MODELE=MODEL,
               CHAM_GD=CONTACT,
               FONC_MULT=(_F(
                   FONCTION=force_time_history,
                   GROUP_MA=BODY_1,
                   COEF_MULT=1.0
               ), _F(
                   FONCTION=displacement_time_history,
                   GROUP_MA=BODY_2,
                   COEF_MULT=1.0
               ))

! Solve the equations of motion for the system and compute the time-history response of the bodies
CALC_CHAMP(reuse=RESPONSE,
           MODELE=MODEL,
           CHAM_MATER=MATERIAL,
           CHAM_INIT=INITIAL_DISPLACEMENT,
           EXCIT=(_F(
               CHARGE=LOAD,
               TYPE_CHARGE='FONCTION'
           )),
           INCREMENT=_F(
               INST=time_step,
               CRITERE='RELATIF',
               PRECISION=0.01
           ),
           NEWTON=_F(
               MATRICE='TANGENTE',
               REAC_ITER=1,
               RESI_GLOB_RELA=1.0E-6
           ),
           ARCHIVAGE=_F(
               RESULTAT=result_file,
               FORMAT='ASTER'
           ))

So my question is what is the operator LIAISON_SOLIDE_SPH which supposed to be part of standard library bibmater_meca.
Bibmater_meca should be part of the standard libraries that are provided with the software, and it contains the LIAISON_SOLIDE_SPH command that is used to define a spherical solid joint between two bodies.

Where can I get information/literature/knowledge on obtaining and importing bibmater_meca and of course of the proper usage of operator LIAISON_SOLIDE_SPH.

Thank you and kind regards.

Last edited by EnKiNekiDela (2022-12-10 12:44:08)

AsterO'dactyle

Administrator

Registered: 2007-11-29

Posts: 450

Re: Unknown operator: LIAISON_SOLIDE_SPH

Hello,

CALC_CHAMP with this syntax, LIAISON_SOLID_SPH and IMPR_FONC_MULT are not part of code_aster standard commands.

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Code_Asterの開発者

EnKiNekiDela

Member

From: Slovenija

Registered: 2021-11-07

Posts: 24

Re: Unknown operator: LIAISON_SOLIDE_SPH

Hello, thank you for your answer.

Would you be o kind and just share information if they are pat of some special non-public libraries?

Thank you and best regards.

miib

Member

From: Near Goethe's Palm (Padua).

Registered: 2021-03-23

Posts: 364

Re: Unknown operator: LIAISON_SOLIDE_SPH

they are pat of some special non-public libraries?

.

maybe

how do you recall this command in your sw available ???

in common version i don't find it :-)

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AsterO'dactyle

Administrator

Registered: 2007-11-29

Posts: 450

Re: Unknown operator: LIAISON_SOLIDE_SPH

Hello,

I don't know these commands. They were developed by someone else in the community and I have no information on the subject.

Sorry

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Code_Asterの開発者

nicolas_p

Member

Registered: 2020-04-14

Posts: 83

Re: Unknown operator: LIAISON_SOLIDE_SPH

The most probable is that ChatGPT gives non-sense results.