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Hello,

I am calculating the potential energy of a Hunt-Cross Ley force given by a contact of a sphere-halfspace. Checking the simbody here: https://github.com/simbody/simbody/blob ... #L396-L475 I have doubts about the material properties E1 and E2. E1 would be the plane-strain modulus of the sphere material (in my case carbon-fiber), and E2 of the halfspace material, right?

Is there a way to introduce this parameters in the OpenSim model, so Opensim can calculate it by itselft?

Thank you for your help,
Bests.

Please see Section 11.2 in the Simbody Theory Manual (click on "SimbodyTheoryManual.pdf" here: https://github.com/simbody/simbody/tree ... imbody/doc). The "Building a Dynamic Walker in Matlab" example (https://simtk-confluence.stanford.edu/d ... +in+Matlab) uses them so you could look there for an example.