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[Jan Stránský <question706413@xxxxxxxxxxxxxxxxxxxxx>]

Question #706413 on Yade changed:
https://answers.launchpad.net/yade/+question/706413

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

> Why do "some" of the particles exit from the top of the facet when the plate is used to compress the particles?
>
> density = 3400.0
> young = 3e8
> O.forces.setPermF(upper_plateID,(0,0,100e3))

The force applied is so high that the stiffness of sphere-facet contact cannot hold the spheres.
(Maybe also inertia effect might play some role, but I think it should not be the biggest problem.)

> Is there a solution to this problem?

- decrease the force
- increase the sphere-facet contact stiffness (increase stiffness globally or just stiffness of the facets)
- if the values are correct, use non-linear (Hertz-Mindlin?) contact law

Cheers
Jan

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