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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Ok, it was only a sign problem. :-)
It seems your conclusion on bad conservation when out of equilibrium is 
correct (consistent with your previous findings too).
>     You'll see that I initialized total energy at 0 at the begining of
>     compression.
>
> BTW, Q. : how do you initialize to zero a variable you were storing in 
> plotData()? How to do it in python?
plot.addData(i=O.iter,e22=-triax.strain[1]-refstrain2,...)
With refstrain2=0 initialy, and triggering later 
refstrain2=-triax.strain[1].

Bruno