Generating Subset Collection for 2D Subset-DICΒΆ

  • Open the PreProcessor
  • Set the “Camera Mode” DropDown List to “Camera 1” (optional)
  • In the Image Panel , load the first image in the image sequence you want to analyze.
  • Open the Subset Tool
  • In the Subset Tool choose Add Subsets.

The Add Subset Dialog appears and ask for some parameters of the subsets to be added.

alternate text
For a 2D subset DIC-analysis you may define:
  • The size of the subset (default = 20)
  • Wether the initial subset location should be optimized or not. If you are tracking a checkerboard pattern, you may here choose Corner Finder. Otherwise, choose No Optimization.

When the “OK”-buttin is pressed in the Add Subset Dialog an action called Click to define center of subset will be active in the current view.

  • Click on the image to define subsets. Each mouse-click during this action will add a subset to the subset collection.

In the image below a single subset has been added at the tip of a projectile.

alternate text

Hint

The subset tracking analysis assumes small deformations/movements of the subset(s) between succeeding images (same as for standard DIC with mesh). To overcome large “jumps” in displacement bewteen succeeding images, it is possible to define a Subset Velocity Vector to the subsets.

  • When you are happy with the subset collection, you can save it as a file (*scol).
alternate text

Hint

It is not required, but you may want to save the subset collection in a subfolder under the image folder, where you also save the input file (in the next step).

You are now done making the subset collection for a 2D Subset-DIC analysis.

  • Remember where you saved the subset collection file (*.scol) and close the PreProcessor