How to analyze HS‐Glass?

In heat strengthened glass, not a lot of cracks are formed due to the lack of strain energy. Therefor, there are only a few cracks visibile in fracture scans. Also, the surface of the crack is very smooth and perpendicular to the glass surface, hence they are not always clearly visible in fracture scans.

To also be able to analyze such scans, an option --from-label has been introduced:

fracsuite specimen import [specimen_name] --imgsize 4000 4000 --realsize 500 500 --from-label

To successfully run the import, follow these steps:

1. Take the original scan in its original dimensions and load it into any image processing tool (like GIMP or Photoshop)
2. Create a transparent layer on top, where you roughly mark cracks in black
3. When you are done marking the cracks, add another layer underneath that is white. You have now created a label!
4. Export the image and save it next to the inputs of the scans, make sure to prepend "label_" to the filename!
5. Run the script as stated above!

The script will use the label to find cracks and splinters instead of the original scans. The algorithm will also reduce the label to 1px wide lines. Hence it is sufficient to mark the cracks roughly, the script will reduce it either way.