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[chiara modenese <c.modenese@xxxxxxxxx>]

This is because ScGeom algorithms don't need total strain (*). (*) One
exception : HertzMindlin, thats why I suggested deriving it from Dem3Dof
rather than ScGeom.

Hi guys, perhaps I am escaping something. Why would HM need total strain? As
it is now it is incremental, same way as computed in PFC.
Anyway, PFC or not I have been studying Mindlin's paper and I plan to code
the exact formulation in the future. And again it is all incremental. So no
problem on my side with the current design.

Cheers. Chiara