Nastran Arbitrary Beam Cross Section shear stress

[gotm]

Please,

I found the ABCS method described in MSC Nastran 2022.1

Linear Static Analysis User’s Guide Ch. 4 page 137 onw.

that is, after an arbitrary cross definition, the complete stress recovery

for the whole cross section, with torsion and shear effects included.

It seems that a FEM for each section is generated (GRID and CTRIA6),

Nastran run with .f06 and .op2 up to Von Mises section plots also.

Is there any link to Patran menu?

 

[dmapguru]

There are tools available for pre-processing the ABCS in Patran - look at the Tools, Beam Library... menu and set the object type in the dialogue to Arbitrary Shape. Both contour point (boundary loop) and centreline point methods are available.

For post processing, I think you have to request FORCE output to get stress for the entire section and set PARAM,ARBMFEM,YES to obtain the section mesh for post processing. Results data is written to op2 format to be imported into Patran for fringe plotting.

There is a write up on the capability in the MSC Nastran Release Guide for 2005r3 (emphasis on r3) as well as the information in the Linear Static Analysis User’s Guide.

DG

 

[gotm]

Thanks a lot DG!
Yes the procedure it seems reasonable, I found also that Release Guide.
I'll check asap.
A Patran PCL would be appreciated in the Utilities .
Attached something related.
Regards.

 

[dmapguru]

That paper is discussing an anisotropic material case. For this, you should look at the V2007 MD R2 Nastran Release Guide and search for the section entitled "Composite Beam Using VAM" - this is an acronym for the Variational Asymptotic Method and will support both isotropic and composite properties and uses the ABCS capability. Yes, PCL would be nice to compare the answers.
DG