Find Hill criteria with MSC.PATRAN 2000

[Methos31]

Hello,
Does anyone know how to find Hill criteria value (and value Nx,Ny,Nxy,Mx,Mxy) after a processing with MSC.NASTRAN ?
These values deal with bending on sandwich panels.
Can they be found on .f06 file ?
Can they be found thank to a command in Patran while post-processing ?

 

[jediknight]

Hi Methos31

The route I use to ensure the Hill criteria is specified when writing out the Nastran .bdf file. This can be done from Patran by specifying within the failure selector card of the Materials Input, the composite failure theory is Hill.

This writes out Hill in the PCOMP card in the .bdf file. However you do need to specify PARAM,NOCOMPS,0 in the bulk section to examine ply stresses.

After your run, the search for the failure index can be done by a MSC N failure Index routine in the Patran Utility/Results menu. This reads the .F06 file to generate the failure index contours of the component using the Hill criteria.

To determine Nx, Ny, Nxy, Mx, My & Mxy values, identify the node that is of interest, and do a search in a text editor such as Notepad to find the nodal result. In the .bdf file STRESS(SORT1,REAL,VONMISES,CORNER)=ALL in the Subcase output section needs to be present.

Hope this helps

B jedi-knight@fsmail.net