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[Leonard <question684846@xxxxxxxxxxxxxxxxxxxxx>]

New question #684846 on Yade:
https://answers.launchpad.net/yade/+question/684846

Hi,
I am confused about the concept of the plastic part of normal displacement (un^p) in Law2_ScGeom6D_CohFrictPhys_CohesionMoment [1].
I reviewed some papers such as "Discrete modeling of granular soils reinforcement by plant roots[2]" and "Calibration of DEM material parameters to simulate stress-strain behaviour of unsaturated soils during uniaxial compression[3]".
In these two papers, they use Law2_ScGeom6D_CohFrictPhys_CohesionMoment as the contact law, but there is no un^p in their model. 
Why there is a difference between Yade document and these papers? 

Thanks
Leonard

[1]https://yade-dev.gitlab.io/trunk/yade.wrapper.html?highlight=cohfrict#yade.wrapper.Law2_ScGeom6D_CohFrictPhys_CohesionMoment
[2]https://www.sciencedirect.com/science/article/pii/S0925857413001936?via%3Dihub
[3]https://www.sciencedirect.com/science/article/pii/S0167198718314909

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