I am trying to implement the Mindlin's formulation for the stiffnesses. One
question: do we maintain the history of the normalForce for each iteration for
a specific interaction? Cause I actually need to update the value of the
stiffnesses according to the value of the normal force..
There are many ways to write the HM relation. You can use normal
penetration instead of normal force. In that case, no need to keep the
history of Fn : you have it in Un.
Bruno
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