4.6 TORUS NO.6 WITH 3 NODES

This element is implemented only for historical reasons and possible data exchange to other FEA systems. Much better: Torus No.8 or Torus No.12 or No.15.

This is a simple, triangular torus element with linear shape functions for rotational-symmetric structures. The displacement results for this very simple element are quite useable, but the stress calculation results are inaccurate. The stresses are calculated in the corner nodes internally and then distributed as average value in the center of gravity. However, the use of the torus elements No.8 or No.12 or No.15 is highly recommended especially for accurate stress calculations. No entries into the surface and pressure loads file Z88I5.TXT!

Input:

CAD (see chapter 2.7.2): 1-2-3-1

Z88I1.TXT

> In principle cylindrical coordinates are expected: KFLAG must be 0 !
R coordinate (= X), always positive
Z coordinate (= Y), always positive
> 2 degrees of freedom for each node, DOF R and Z (= X and Y)
> Element type is 6
> 3 nodes per element
> Cross-section parameter QPARA is 0 or any value, no influence

Z88I3.TXT

> INTORD , any, has no influence
> KFLAG , any, has no influence
> Reduced stress flag ISFLAG:
0 = no reduced stress calculation
1 = von Mises stresses, plotted in the centre of gravity
2 = principal stresses, plotted in the centre of gravity
3 = Tresca stresses, plotted in the centre of gravity

Results:

Displacements in R and Z (= X and Y)
Stresses: The stresss are internally computed in the corner nodes, but plotted in the center of gravity.
It is: SIGRR = stress in R direction = radial stress (= X direction), SIGZZ = stress in Z direction (= Y direction), TAURZ = shear stress in RZ plane (= XY plane), SIGTE = stress in peripherical direction = tangential stress. Optional von Mises stresses.
Nodal forces for each element and each node.