Hello everyone,
I am simulating a mechanical model in Code_Aster and would like some advice on how to make an intermediate part non-deformable. The context is as follows:
Background of the problem
Geometry and mesh: I have a geometry composed of 7 pieces: 6 screws M12 and an intermediate part. I created a partition to bring all these pieces together and I defined a fixed surface (end of screw thread) and an effort surface (on the intermediate part). Each item is represented by a separate volume.
Mesh: I used Netgen to automatically mesh this geometry in 1D, 2D and 3D.
Import into Code_Aster: I imported the mesh and created groups from the geometry.
Current Modelling
Here is the code I have written so far:
mesh = LIRE_MAILLAGE(UNITE=20)
model = AFFE_MODELE(AFFE=F(MODELISATION='3D',
PHENOMENE='MECANIQUE',
TOUT='OUI'),
MAILLAGE=mesh)
mater = DEFI_MATERIAU(ELAS=F(E=210000.0,
NU=0.28))
mater0 = DEFI_MATERIAU(ELAS=F(E=2.1e+17,
NU=0.28))
fieldmat = AFFE_MATERIAU(AFFE=(F(GROUP_MA=('Vis1', 'Vis2', 'Vis3', 'Vis4', 'Vis5', 'Vis6'),
MATER=(mater, )),
F(GROUP_MA=('Chassis', ),
MATER=(mater0, ))),
MODELE=model)
load = AFFE_CHAR_MECA(DDL_IMPO=F(DX=0.0,
DY=0.0,
DZ=0.0,
GROUP_MA=('Fixe', ),
TOUT='OUI'),
FORCE_FACE=F(FZ=15600.0,
GROUP_MA=('Effort', )),
MODELE=model)
reslin = MECA_STATIQUE(CHAM_MATER=fieldmat,
EXCIT=F(CHARGE=load),
MODELE=model)
unnamed = CALC_CHAMP(CONTRAINTE=('SIGM_ELNO', 'SIEF_ELNO', 'SIGM_NOEU'),
CRITERES=('SIEQ_ELGA', 'SIEQ_ELNO', 'SIEQ_NOEU'),
RESULTAT=reslin)
IMPR_RESU(RESU=(_F(RESULTAT=reslin),
_F(RESULTAT=unnamed)),
UNITE=80)
The model can turn with it is hippothesis the only thing that bothers me in this one above is the use of a fictitious material having a very large module of Young.
I would like to know if it is possible to do as mentioned above to make a piece indeformable.
I thought used the Oblique Link operator in the Link module to remove the displacement between the meshes of the intermediate part but it only brings me errors.
Example:
I also tried with Liaison rigide but after calculation it returns me this error message:
Can you help me find a solution to make the intermediate part non-deformable without using a dummy material? I am willing to modify my model for more physically relevant results.
Thank you in advance for your advice!
Feel free to add or change details if necessary.
