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Nodal principal stress plot direction and list in data table

Dear all,

 

I would like to determine a principal stress direction though the thickness of a pressure vessel.

PV.PNGgeometry

The pressure vessel is modelled with a 1°order brick element and constrained with  axisymmetric constraints.

After the analysis I obtain this plot:

 

60031 VM results.PNGAutodesk Nastran Von Mises results

I need to extrapolate the principal stress direction in nodes along the thickness in the major stressed area.

I use arrow contour style but principal stress are oriented along the Global coordinate system  (the reference coordinate system in the various figures).

 

Principal stress.PNGPrincipal stress along global coordinate system

 

 

I then insered a local coordinate system, oriented with 1 of the axis though the thickness.

 

 

Local sdr.PNGLocal coordinate System

And then I selected the new coordinate system:

 

New coordinate.pngNew Coordinate system

 

 

THE PROBLEM IS:

 

After the definition of new coordinate system, the vector are aligned to these vector, BUT THE VALUE ARE THE SAME.

 

no stress value difference.pngNo stress difference

 

I neew to extrapolate (plotting and list in data table, the 6 stress tensor component, to using them in other software.

Can anyone help me?

I attach modfem ad .FNO results.

 

Best regards

Stefano