07-26-2017 05:25 AM
Hi
Is there a way to suppress the calculation of the von Mises RMS stress (which I assume is the time consuming calculation) in the case control STRESS request?
My model takes too look and uses too much disk space in calculating random stresses so I would like to calculate a pseudo (max possible) von Mises RMS stress using the other RMS stress components (X, Y and XY) in FEMAP.
Even if I ask for STRESS(SHEAR)=ALL or STRESS (MAXS)=ALL, the von Mises RMS stress is calculated by default for a random analysis.
Thanks
07-26-2017 09:03 AM
System cell 579/FREQVM. See the Basic Dynamic Analysis User's Guide documentation at:
07-26-2017 09:55 AM
Hi JimB
With the setting
NASTRAN FREQVM=1
and request
STRESS(SORT1,PRINT,CENTER) = 1
I still get von Mises RMS stresses in my f06 file.
I also get corner stresses , when I am asking for CENTER output.
Am I missing something?
07-27-2017 02:15 AM
Hi JimB
I did further checking
Nastran FREQVM=1 does turn off the calculation of von Mises stresses in a frequency response run, but not a random analysis.
Stress(CENTER)=ALL outputs stresses at the corner of the elements too. Should this be the case? The manual says "Outputs stresses at the center of the element only."
Any other ideas how to suppress the von mises stress calculation in an random analysis?
I am using Nastran 11.0.1
Thanks
Peter
07-28-2017 12:37 AM - edited 07-28-2017 12:38 AM
VM stresses aren't what takes a long time in SOL111, stresses in general do. Even if you use the XYPEAK method instead, it will still take forever... But at least XYPEAK will give you what you want. Setting up the XYOUT requests is easily done with FEMAP...