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[Bruno Chareyre <question262775@xxxxxxxxxxxxxxxxxxxxx>]

Question #262775 on Yade changed:
https://answers.launchpad.net/yade/+question/262775

Bruno Chareyre proposed the following answer:
If the problem is not in your contact law, it could be simply the timestep too large, violating stability condition.
If the problem is in your contact law, it is hard to guess where it can be. Are you sure that you never return NaN contact forces before shearIncrement() becomes NaN (i.e. the step before).

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