[SOLVED] hey need help with a 2D beam problm .comm

In EFICAS, you can validate your command file by using JdC->Rapport de...
Perhaps the underscore in the name of AFFE_CARA_ELEM is invalid, it is here.

You also need to include the AFFE_CARA_ELEM in MECA_STATIQUE with CARA_ELEM

/C

Hoi d_riel

you have to apply an AFFE_CHAR_MECA to the massN node/group. You have to define properties to this group; C-Aster does not invent for you. Eg, for another group you defined:

elemcar=AFFE_CARA_ELEM(MODELE=model,
POUTRE=(_F(GROUP_MA='mast',
SECTION='RECTANGLE',
CARA=('HY','HZ','EP'),
VALE=(40,20,1.5,),),
_F(GROUP_MA='topbeam',
SECTION='RECTANGLE',
CARA=('HY','HZ','EP'),
VALE=(40,20,1.5,),),),);

I guess you want to apply a mass to this group, something like, but most likely not exactly the same as below:

N_stmass=AFFE_CARA_ELEM(MODELE=CylModel,
INFO=2,
DISCRET=(_F(CARA='M_TR_D_N',
GROUP_NO='Nmaster',
VALE=[0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.00,0.00,0.00]),
_F(CARA='K_TR_D_N',
GROUP_NO='Nmaster',
VALE=[0.0,0.0,0.0,0.0,0.0,0.0]),),);


I you need more detail, please state what you would like to build.

Hoi d riel

i am not really sure what you reall want.
Is the node massN already part of 'topbeam' and you only want to apply a load (force) on that node?
You defined a vertical load FZ on all nodes of topbeam and weight on all nodes of topbeam and mast:

selfwght=AFFE_CHAR_MECA(MODELE=model,
PESANTEUR=_F(GROUP_MA=('topbeam','mast',),GRAVITE=10000,DIRECTION=(0,0,-1,),),);
cr=AFFE_CHAR_MECA(MODELE=model,FORCE_NODALE=_F(GROUP_NO='topbeam',FZ=-10.0,),);

(you need to apply RHO in de steel definition for gravity as well).

in meca_statique you need to add charge=cr for the force:

RESU=MECA_STATIQUE(MODELE=model,
CHAM_MATER=material,
CARA_ELEM=elemcar,
EXCIT=(_F(CHARGE=ground,),
_F(CHARGE=cr))) ### add this too

Okee, I donot know geo, but looking into geo, I think massN is part of the structure, so no need to define in AFFE_CARE_ELEM and AFFE_MODELE (if, again, I understand correctly):

remove:
DISCRET=_F(CARA='M_T_D_N',
GROUP_NO='massN',
VALE=.01,),);

and

_F(GROUP_MA='massN',
PHENOMENE='MECANIQUE',
MODELISATION='DIS_T',),),);


Fznm=AFFE_CHAR_MECA(MODELE=model,
FORCE_NODALE=_F(GROUP_NO='massN',
FZ=-10.0,),);


and apply a force on massN too, and add in MECA_STATIQUE.
But maybe I misunderstood, and probably do because now the load is defined twice in z direction.
Pls let us know.