Modal analysis with glued contact and zwo different materials

Strak

Hello,

I am currently trying to simulate a modal analysis with two glued bodies and two different materials.

I have managed to glue two meshes in a modal analysis, but I am not able to assign different materials to the two meshes. With ASSEMBLAGE I can only select one material field, if I double ASSEMBLAGE I get an error message. Does anyone have an idea or an example code for me?

Best regards and many thanks!

DEBUT(LANG='EN')

mesh_Traeger = LIRE_MAILLAGE(FORMAT='MED',
UNITE=3)

mesh_Spiegel = LIRE_MAILLAGE(FORMAT='MED',
UNITE=4)

Gesamtnetz = ASSE_MAILLAGE(MAILLAGE_1=mesh_Traeger,
MAILLAGE_2=mesh_Spiegel,
OPERATION='SUPERPOSE')

model = AFFE_MODELE(AFFE=_F(MODELISATION='3D',
PHENOMENE='MECANIQUE',
TOUT='OUI'),
MAILLAGE=Gesamtnetz)

Glas = DEFI_MATERIAU(ELAS=_F(E=80000.0,
NU=0.23,
RHO=2.5e-09))

zuw_Glas = AFFE_MATERIAU(AFFE=_F(MATER=(Glas, ),
TOUT='OUI'),
MAILLAGE=mesh_Spiegel)

Aluminium = DEFI_MATERIAU(ELAS=_F(E=200000.0,
NU=0.3,
RHO=2.5e-09))

zuw_Aluminium = AFFE_MATERIAU(AFFE=_F(MATER=(Glas, ),
TOUT='OUI'),
MAILLAGE=mesh_Traeger)

Fix = AFFE_CHAR_MECA(DDL_IMPO=_F(DX=0.0,
DY=0.0,
DZ=0.0,
GROUP_MA=('FIX', )),
MODELE=model)

Kontakt = AFFE_CHAR_MECA(LIAISON_MAIL=_F(DISTANCE_MAX=0.1,
GROUP_MA_ESCL=('11', '22'),
GROUP_MA_MAIT=('Rott', ),
TYPE_RACCORD='MASSIF'),
MODELE=model)

ASSEMBLAGE(CHAM_MATER=zuw_Aluminium,
CHARGE=(Fix, Kontakt),
MATR_ASSE=(_F(GROUP_MA=('Rott', ),
MATRICE=CO('rigidite'),
OPTION='RIGI_MECA'),
_F(GROUP_MA=('Rott', ),
MATRICE=CO('masse'),
OPTION='MASS_MECA')),
MODELE=model,
NUME_DDL=CO('numeddl'))

ASSEMBLAGE(CHAM_MATER=zuw_Glas,
CHARGE=(Kontakt, ),
MATR_ASSE=(_F(GROUP_MA=('S1', 'S2'),
MATRICE=CO('rigidite'),
OPTION='RIGI_MECA'),
_F(GROUP_MA=('S1', 'S2'),
MATRICE=CO('masse'),
OPTION='MASS_MECA')),
MODELE=model,
NUME_DDL=CO('numeddl'))

result2 = CALC_MODES(CALC_FREQ=_F(FREQ=(10.0, 10000.0)),
MATR_MASS=masse,
MATR_RIGI=rigidite,
OPTION='BANDE')

result1 = CALC_MODES(CALC_FREQ=_F(FREQ=(10.0, 10000.0)),
MATR_MASS=masse,
MATR_RIGI=rigidite,
OPTION='BANDE')

IMPR_RESU(FORMAT='MED',
RESU=(_F(RESULTAT=result2),
_F(RESULTAT=result1)),
UNITE=80)

mf

Strak
Hello,
you already created a model, where both meshes are contained within.

All you need to do, is define volume groups in these meshes (define volume groups in geometry first and then mesh, voila, groups are in the mesh). You simply assign the materials to the volume groups then in AsterStudy.

It doesn't matter much with only two meshes, but it is better to create a mesh compound in the mesh module instead of using ASSE_MAILLAGE (very slow if a lot of meshes) and just import this one mesh into AsterStudy.

Find a Salome Meca hdf here with a little example: https://drive.google.com/file/d/1tpwPdvAchict7pFjwMqRURF336Smvowr/view?usp=sharing

Let me know if the download and the file works, we might not use the same version of SM,

Mario.

Strak

Hello, thanks for the quick feedback. My problem is not that I can't assign different materials to the bodies. I have more of a problem with: ASSEMBLAGE. I can only select one material field there. If I insert ASSEMBLAGE twice I have a problem with rigidite and nummeddl.

Best regards

mf

Strak

Obviously, that is exactly the problem, because you did not do it correctly. As Msr. Aubry wrote, there is only one material field in one simulation.

Mario.

jeanpierreaubry

hello

in ASSEMBLAGE you introduce a single material field defined in AFFE_MATERIAU

the different materials are assigned in this operator (AFFE_MATERIAU) there you can assign as many material as you want specified on their GROUP_MA
that is all

jean pierre aubry

Strak

Thank you very much, now I have understood it!
had an error in my thinking.

best regards