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[Bruno Chareyre <question236400@xxxxxxxxxxxxxxxxxxxxx>]

Question #236400 on Yade changed:
https://answers.launchpad.net/yade/+question/236400

Bruno Chareyre proposed the following answer:
The contact law defines fn as a function of un. There is really no difficulty in making the relation piecewise linear (I understand this is what you want to do).
The current contact laws don't have this behavior though, so you will need to write a new one, or modify an existing one if it does not interfer too much with its present behavior.
If you want to commit your change to an existing law, requirements are that 1/ the default behavior should not be modified and 2/ it does not imply that users of the current code will have to carry more variables (e.g the secondary stiffness) in the interactions.

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