I have problems with measuring contact area and penetration depth in the 6 DOF shoulder model.
The stiffness of articular cartilage was defined as 2.79e6 in this model.
After FDK procedure, the contact area and the penetration depth in the shoulder joint were measured as too large regardless of the humeral offset and the pressure module.
The tutorial shows how to do contact by means of stls, so you can control the stl and there by contact area. For the penetration the tutorial gives example of how to control the pressure module to change the penetration.
In the tutorial, changing sRel of STL can affect the penetration depth. However, It couldn't be solved by changing sRel in my model.
If the pressure module is too low like 5e-2, my model can run the FDK. But I am not sure 5e-2 is a reasonable value for validation.
The exact value of the pressure module is not something I can give you, I would suggest to look at existing literature or setup a experiment to test it.
