code aster / astk / eficas help

I am trying to do a 3D FEA of stress/deformation in a block with a hole (jml tutorial #1) without using the wizards in salome. I have been unable to get a result file and I have a few fundamental issues.

When I create mesh groups do I use groups of faces or groups of nodes for applying boundary conditions? I figured I would try each one and then both (didnt work) but this seems to indicate that this is not my only problem.

What is ASJOB? Every job comes up with PEND. If I select 'Actualiser' (Update?) I get COPY ERROR. What does this mean?

Thanks in advance,
- Matt Bondy

Thanks for the assistance. I went through the .mess file which contained a wealth of information. I named my mesh groups +x,+y,+z,-x,-y,-z,+xf,+yf,etc where f denoted groups of faces. It looks like +/- signs cannot be used when naming groups.

Just out of curiosity does Aster allow one to specify linear displacements and pure rotations on boundaries separately?

Thanks again,
- Matt Bondy<br /><br />Post edited by: Matthew Bondy, at: 2009/10/03 18:51

Hi Matthew

When I create mesh groups do I use groups of faces or groups of nodes for applying boundary conditions?

It depends on the Aster-command if a GROUP_MA (group of elm) or GROUP_NO (group of nodes) as input is needed. Very often both options are possible (You have the choice). Then it is generally more versatily to work with GROUP_MA. The nodes used by Code-Aster are all nodes attached to the elm contained in this GROUP_MA.

does Aster allow one to specify linear displacements and pure rotations on boundaries separately?

Of course yes. The command for applying lin displ and/or rotations is such a command which gives You the choice to input GROUP_MA or GROUP_NO. And You can combine any components of DX, DY, DZ, DRX, DRY, DRZ seperatly.

AFFE_CHAR_MECA(DDL_IMPO=_F(GROUP_NO='gr_no',DRX=1.0,DRY=2.0, etc

or

AFFE_CHAR_MECA(DDL_IMPO=_F(GROUP_MA='gr_elm',DX=1.,DY=2.,DZ=0.

or, fixing the nodes in all degrees of freedom:

AFFE_CHAR_MECA(DDL_IMPO=_F(GROUP_MA='gr_elm',LIAISON='ENCASTRE',

Attention: when applying rotations (DRX, DRY, DRZ) You must be shure that Your elements (elm types assigned be AFFE_MODELE) have these components at their nodes. You do not have to care about this if You use

AFFE_CHAR_MECA(DDL_IMPO=_F(GROUP_MA='gr_elm',LIAISON='ENCASTRE',

which simply fixes all components contained by the nodes to zero.

I named my mesh groups +x,+y,+z,-x,-y,-z,+xf,+yf

Do not use special caracters for names of groups (or any other concepts) in Code-Aster.

I wish You good success

Regards,<br /><br />Post edited by: johannes ackva, at: 2009/10/05 11:27

Thanks for the advice and assistance.