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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> Perhaps I guess that dealing with _quasi-static conditions_, energy 
> considerations become superfluous (that is maybe why nobody here has 
> approached the problem?). On the other hand, if the problem is 
> _dynamic_ I think they matter.
Is not supefluous under quasistatic conditions, and I approached the 
problem before (in PFC, but 2+2=4 everywhere).
Again : in quasistatic conditions you find Wboundaries = Welastic + 
Wplastic, and it is a very strong point to show the consistency of 
simulations.
For dynamic situations, you alreadt pointed out what to fix : the dt/2 
shift.

Bruno