Question #172107 on Yade changed:
https://answers.launchpad.net/yade/+question/172107
Status: Open => Answered
Chareyre proposed the following answer:
Consider that strain (be it a ekk component or epsv) can be defined exactly
from its derivative: de/dt=dL/(L.dt) (resp. dV(V.dt).
Then by integrating between t0 and t, you get a logarithm. Hence epsv =
log(V/V_0)
Consider diving into this:
http://en.wikipedia.org/wiki/Deformation_%28mechanics%29
Quoting:
"The logarithmic strain provides the correct measure of the final strain when
deformation takes place in a series of increments, taking into account the
influence of the strain path"
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