> I would need the incremental formulation because I need to make > distinction between loading and unloading stage. Do you see other ways > to do that? Anyway not sure that the incremental formulation is the > solution of my problem.. If you need just that distinction, it would be enough to either store previous deformation and compare it with the current one, or compute sign((v₂-v₁)·n ); and still use total deformation for current value.
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