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[Jan Stránský <question694217@xxxxxxxxxxxxxxxxxxxxx>]

Question #694217 on Yade changed:
https://answers.launchpad.net/yade/+question/694217

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

> I am a new user of Yade

welcome :-)

> But when the two particles are under tension stress and leave each
other, the stiffness of bonding should have nothing to do with the
modulus of particle self and it should only depend on the bonding
material itself.

One way how to represent DEM is that particles are perfectly rigid and "their material" actually is (or defines) the properties of interactions (the bonding material).
>From this point of view, yes, "the stiffness of bonding DO have nothing to do with the modulus of particle self and it DOES only depend on the bonding material itself".

However, for simple models, the stiffness of compression and tension equals, which is just from the definition of elastic material.
If you need different behavior, you have to use some more fancy material model.

Also note that in Yade changing of materials of particles has no effect on existing interactions.
On scenario for these use cases is:
- define materials of particles just for initial bonding
- create initial bonding
- change material of particles to "self" material (bonding interactions remain untouched), for the case of particle interactions after debonding / interactions of initially not bonded particles

> Also the shear stiffness should be different.

you are already using "poisson", which defines the "difference" of
normal and shear stiffness [1].

cheers
Jan

[1] https://yade-
dem.org/doc/yade.wrapper.html#yade.wrapper.CohFrictMat.poisson

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