When we haven't De Saint Venant we have Non Uniform Torsion.
Torsion angle unitary is different for each z
http://ingsolution.nethttp://files.engineering.com/getfile.aspx?folder=c8f82e53-d367-4240-a7d8-50a669fd5824&file=forengtips.zip
how are you loading this ? (to get non-uniform torsion)
or does the thread header refer to non-uniform torsional stresses ??
To simulate the presence of a twisting moment I entered at the end of the beam 2 shear stress applicated in the wings:
tauZX=M/(h*thik)
Then thank to IDS, I think u've...
Theoretical stresses are the same of QUAD4.
Here there are a comparison with VM's stresses along the edge of the wing (1) and along the center of the wings (2)
Then you can find a theoretical stresses, it's sigma(1)-TNU and sigma(2)-TNU
Numerical results are from model with QUAD4.
For QUAD9...
no no QUAD8! QUAD9! I need the same nr of nodes!
I'm testing the Non Uniform Torsion that is valid only for opened thin sections.
Enclosed tube isn't a thin opened section.
I took the now famous double-T section, and I modeled once with QUAD4 and once with QUAD9.
Obviously I maintain constant the number of nodes.
In practice: 1 QUAD9 = 4 QUAD4
I maintain the same material and same boundary conditions (loads and constraints).
I found that the von Mises stress...
