This is a function for both viewing and exporting output from the linear elastic Finite Element Analysis of the contour method.
This function can be called independently by importing the preprocess module from pyCM and then calling launch:
>>>from pyCM import postprocess as post
>>>post.launch()
Then, upon launching, the pyCM data file can be loaded via a GUI by pressing the l key if launched independently, or by specifying the file directly i.e. post.launch('full_path_to_file.pyCM'). If using the pyCM main function, Shift+l will load any data from the active file. This results in a populated widget as shown in Fig. 1.
Figure 1: Postprocessing widget displaying a loaded pyCM file with S33 data being shown.
This pyCM file must contain the following at minimum:
| Input | Description |
|---|---|
| Mesh information | A mesh strucutre with fields/groups correspoinding to an unstructured grid with point data. This includes points: node locations, cells: element connectivity, cell_types: an array of VTK cell (elements) types, cell_locations: cell/element numbering. A final group point_data containing entries for S11, S22 and S33 - stresses relieved by the cut in the x and y directions, as well as the full stress component acting in the z direction, respectively. |
The stress component to be displayed can be selected with the drop-down menu. Default components which are tabulated by pyCM is S11, S22 and S33. The default shown is S33, as this is a complete component that is rendered by pyCM.
The element edges of the mesh can be turned off and on by actuating Edges off (on by default), and if implemented in the registration step, the reference cutting orientation display can be toggled with Show cut.
The ability to change the thresholds for contour levels on the legend can be effected here, as well as the number of intervals by making changes and pressing Update. Note that these reset on changing the stress component viewed under Display.
The ability to perform a line trace over the cut profile to gather stress values as a funciton of distance is possible. Entering in the start and end point of the line with the Start and End and then Update line will plot this data in an embedded graph. The Clip button will clip the displayed mesh on a plane defined by this line and the z normal direction. This is to observe/characterise subsurface die-back lengths and ensure that the result is valid. To reverse clipping/reset the view, change the stress component under Display.
The Export line button permits exporting the data represented by the line in the form of a *.csv file with the output format being x and y location along with the stress component active when selected.
The Export selected component button will generate a *.csv file which contains *all x and y locations of the contour surface nodes along with the active stress component at that location. Note that very dense meshes may create a very large file and this may take a while to complete.
| Key | Description |
|---|---|
| Left mouse button | Rotate about the center of view |
| Middle mouse button | Pan |
| Right mouse button | Zoom/refresh window extents |
| 1 | View 1, default, looks down z axis onto xy plane |
| 2 | View 2, default, looks down x axis onto zy plane |
| 3 | View 3, default, looks down y axis onto zx plane |
| i | Save interactor to pyCM_capture.png in the current working directory |
| l | load/reload *.pyCM file to conduct/review/revise this analysis step |
None at this time.