Surface strain fitting

Description

• An automated script that runs this tutorial is included in the Continuity installation: \examples\data08\strain-fitting.py. To run it, click File→Read script→Python or session script

Get undeformed mesh

• Launch the Continuity 6.3 Client

• File→Load→Model

  • If not already there, browse to your Continuity installation directory (…/Continuity/pcty)
  • Browse to examples/data08

  • Select g1-ready.cont6

  • Click Open

  • To make sure you selected the right cont6 file, verify the following:

    • Mesh→Edit→Basis…

      • Check that the list contains only Cubic-Cubic Hermite 3*3

    • Mesh→Edit→Nodes…

      • Check that that there are only 4 nodes defined

    • Mesh→Edit→Elements…

      • Check that there is only 1 element in the list
    • Make sure that Fitting and Biomechanics modules are loaded

• File→Send

• Mesh→Calculate Mesh…

Performing Fit

• Fitting→Fit Data

  • Coordinates tab
    • Match Coordinates 1-3 and Deformed Coordinates 1-3 up with their corresponding data columns. It should be pretty obvious what to select.
  • For the Fitting Variables tab:

    • Uncheck Coordinates 1 and Coordinates 2

  • Don’t modify the Fibers, Fields, Xi Projections, Calculate Error, and Update tabs.
  • Click the “Fit” button
  • Once the fit completes, you can close the Fit form

Calculate and Render Strains

• Mesh→Render→Elements…

  • Click the undeformed button and Render

• Repeat above step but render deformed elements

• Biomechanics→Render→Strain…

  • Choose E11 from the Type pop-up menu

  • Define a range between -0.05 and 0.15

  • Click the deformed button

  • Click Render

• The mesh should now look similar to the screenshot above (if you currently don’t see anything, try zooming out, then try zooming in)

Pre-built model

This cont6 file contains all data and parameters for this problem: fit6.cont6