To perform a weld strength or fatigue checks on welds the calculated stresses should be oriented into a weld direction:
X – parallel the weld.
Y – perpendicular to the weld.
In previous version (3.8.5) the weld finder tool updated elements orientation one by one using the Femap API function. As a result conversion procedure was slow (especially on big models) and a rerun of the analysis was required. In version 4 new solution is implemented: stresses are converted automatically into the weld direction, without reorientation.
Weld Stresses are therefore implemented as a separate category. All tables/plots for stresses also can be created for the weld stresses:
The first table shows extreme stresses in the standard element orientation and the second table shows the converted stresses in the weld direction:
On the left plot, the stresses in the element direction are shown and the weld stresses plot is shown at the right page. You can see that only weld elements are converted. For the elements that don’t belong to the weld, the stress is shown in the standard element direction:
To avoid confusion, the user can also plot only the stresses in the weld elements (using Rule-Based Selector):
In our formula editor, it is possible to use the weld stresses in checks by using the Sweld variable. For example, different allowable stresses for shear stress and the normal stresses parallel and perpendicular to the weld orientation can then easily be accounted for:
And for fatigue calculations on welds, the stress variation (SweldDelta) of a group of results in the parallel, shear and perpendicular directions can be calculated as shown in the example below: