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[Jérôme Duriez <question295225@xxxxxxxxxxxxxxxxxxxxx>]

Question #295225 on Yade changed:
https://answers.launchpad.net/yade/+question/295225

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hello,

The doc of "CohFrict.." related classes should help, here (assuming
you're using such contact model, which would probably be a good idea)

1. See [1], together with [2], to understand how the interaction
strength ("normalAdhesion" and "shearAdhesion" of "CohFrictPhys") is
computed from grains with possibly different strength material
properties ("normalCohesion" and "shearCohesion" from CohFrictMat)

2. It is the default behaviour of the "CohFrict.." model to define purely frictional interactions (without cohesion), see setCohesionNow and setCohesionOnNewContacts in [1]
In particular keeping setCohesionOnNewContacts to False will do exactly what you want.

3. I'm not sure I understood your question. All contact models in Yade
consider a "fmin" threshold for the normal force fn (I'm considering
here compression as positive). This "fmin" threshold in Newton is
usually never directly set, though (see previous answers for the
"CohFrict.." model)

As for a maximum compressive force threshold "fmax" I'm not aware any
contact law in Yade considers such thing. If this is what you want, you
will probably have to write your own contact law.


Jerome


[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Ip2_CohFrictMat_CohFrictMat_CohFrictPhys
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.CohFrictPhys

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