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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> Ok, but this means that if one wants to calculate the total energy of 
> the system (e.g. to check whether it is conservative or not) cannot 
> make the sum of the potential energy and the kinetic one as it is now 
> defined, right?
Yes. If you have systems where kinetic energy is not negligeable 
compared to other terms you have to interpolate velocities as 
v(t-dt/2)+acceleration*dt/2.
Check the comparison in attached file for a 1D mass-spring system.
In my case, I always found negligible kinetic energy in triaxial tests, 
so I didn't really care about the dt/2 thing.

Bruno

Attachment: energy.ods
Description: application/vnd.oasis.opendocument.spreadsheet