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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

>     Do you have irreversible non-linearities?
>
> I would need the incremental formulation because I need to make 
> distinction between loading and unloading stage.
If the law is picewise linear, it is still possible to write it with 
total Un (e.g. storing an internal Un_max). If not, you are in the case 
that I was calling irreversible non-linearity, and it might be more 
complex to use total Un (perhaps not impossible). It depends on your law 
really.

Bruno