Download Xtract - DNV GL

Xtract
3-90
Sesam
1-FEB-2011
Program version 3.0
3.83
Figure 3.83 Select among cases in the GLview 3D Plugin window in the PowerPoint slideshow
3.13.2 Combined export of Two 3D Models to VTFx-File – Sub-Model plus Global
Model
Sub-modelling analysis is a technique for refined and quick analysis of a detail of a ‘global’ analysis. It
involves creating a model of the detail, a sub-model, and imposing prescribed (forced) displacement on the
sub-model boundaries. These displacements are taken from the global analysis at positions corresponding to
the sub-model boundaries. In Sesam the program Submod is used to extract such displacements from the
global analysis and impose them on the sub-model boundaries.
It is a crucial quality assurance measure of a sub-modelling analysis to verify that the prescribed displacements of the sub-model boundaries are correct. This may be verified by comparing the deformations of the
sub-model and global model.
Xtract allows such comparison by overlaying the two deformed 3D models. This is done by exporting the
two 3D models to a common VTFx-file which in turn is opened by the Xtract Viewer. In this free program
the sub-model is superimposed on the global model thus allowing interactive inspection of the overlaid
deformed 3D models. Do this by following the procedure outlined below.
Open the global model results file in Xtract and select a result case. Switch on deformed model by Model >
Deformed (or Ctrl+Alt+D). Use Model > Deformation scaling to select a suitable scaling factor, e.g. round
up the program chosen factor. See the dialog to the left in Figure 3.84. Then export the deformed global to a
VTFx-file by:
• File > Combined export
This opens the dialog shown to the right in Figure 3.84. Notice that when selecting Model type = Global
model the model is by default drawn in surface mode using a blue colour.
Note: Any currently shown colour contour presentation of a result component will not be exported.
Note: At this stage do not check the Launch Sesam Xtract Viewer box. Give a file name and click
Export.