New question #251712 on Yade:
https://answers.launchpad.net/yade/+question/251712
Hello,
1. With VTKRecorder it is possible to export normal stress and shear stress of
a particle but what are the physical meanings of normStress and shearStress and
how are these stresses computed? I checked the source code and found the
following sentences might give some hints, but I failed to fully understand
them.
In VTKRecorder.cpp: Line 454 and 455
const Vector3r& stress =
bodyStates[b->getId()].normStress;
const Vector3r& shear =
bodyStates[b->getId()].shearStress;
2. The function bodyStressTensors() calculates per-particle micro-stress which
is a 3 by 3 matrix. I think it would be better to calculate mean principal
stress p and deviatoric stress q from it, which will need a nonlinear equations
solver. I tried to import scipy.optimize [1] but it led to core dumped. Does
eigen library has some modules to solve nonlinear equations? Are there any
software that is importable to Yade will work for this?
I am using git version 2014-06-29.git-de4c01a.
[1]
http://docs.scipy.org/doc/scipy/reference/optimize.html#module-scipy.optimize
Thank you,
Alex
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