Question #679411 on Yade changed:
https://answers.launchpad.net/yade/+question/679411
Status: Open => Answered
Bruno Chareyre proposed the following answer:
That's actually a straighforward case since it's irrotational.
In you example with trsf[2,2]=0.9998 the true target strain is not -0.0002.
You are using the small strain (or "engineering" strain) approximation, and you
suffer the consequences.
The natural strain is not assuming smallness, it is
log(trsf[2,2]=0.9998)=-0.00020002.
As you can see the 2e-8 difference is exactly the missing amount in your final
trsf.
If you need to reach 0.9998 in N steps then the strain rate should be
log(0.9998)/(N*O.dt).
Bruno
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