Question #675377 on Yade changed:
https://answers.launchpad.net/yade/+question/675377
Status: Open => Answered
Robert Caulk proposed the following answer:
Hello,
>> 1) why the same rates produce different strain increments?
I do not understand your question. I ran your script, which explicitly
executes:
triax.maxStrainRate = [rate,rate,0.0]
and finally prints:
"dexx= -3.96592748642e-08 deyy= -3.96592878538e-08 dexy=
2.75274092903e-08"
Appearing to show that equivalent strain rate yields equivalent strain.
Or is it that you believe the transformation matrix, O.cell.trsf[0,1],
should be equivalent to the strain values,
triax.strain[0]=traix.strain[1]?
>> 2) why resetting the cell transformation changes the increments of strain
>> afterwards?
It doesn't:
dexx= -3.96592803723e-08 deyy= -3.96592804735e-08 dexy=
4.00598778322e-08
The strain increments remain the same. O.cell.trsf is simply providing
you with the accumulated transformation of the cell. Or more described
in more detail by Václav [1]:
"Current transformation matrix of the cell, which defines how far is the
current cell geometry (:yref:`hSize<Cell.hSize>`) from the reference
configuration. Changing trsf will not change :yref:`hSize<Cell.hSize>`,
it serves only as accumulator for transformations applied via
:yref:`velGrad<Cell.velGrad>`."
[1]https://github.com/yade/trunk/blob/master/core/Cell.hpp#L153
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