yes I often played with the different factors for the normal stiffness. For penetration some formulation accept penetration as the increased Lagrange and pure penalty formulation. Others do not accept penetration as Normal Lagrange. So in case you choose for example a Normal Lagrange formulation you will not have to enter a value for penetration.
Let me show you the pictures below to illustrate what I am saying:
Let me show you the pictures below to illustrate what I am saying:
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