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[Jérôme Duriez <question404654@xxxxxxxxxxxxxxxxxxxxx>]

Question #404654 on Yade changed:
https://answers.launchpad.net/yade/+question/404654

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hi,

1. The corresponding doc of the function [1], though not crystal clear, suggests that these two matrices just are
- the stress contribution from the normal components of contact forces i.e. 1st right hand side of the equation in [1]
- and the stress contribution from the shear components i.e. 2d right hand of the equation in [1]

The "correct" stress tensor should be the sum of the two. I guess it
should correspond to getStress() [2]: another (simpler) stress
measurement function

2. A servo control algorithm is a set of code operations that should allow to obtain a given stress state, by changing boundary conditions.
A typical example in Yade is TriaxialStressController engine [3] which can impose some stress state to a parallelepiped sample by adequately moving the rigid boundaries that enclose the sample.


[1] https://yade-dem.org/doc/yade.utils.html?highlight=normalshearstress#yade._utils.normalShearStressTensors
[2] https://yade-dem.org/doc/yade.utils.html?highlight=normalshearstress#yade._utils.getStress
[3] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.TriaxialStressController

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