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Re: [Question #693898]: Bonding particles with JCFpm yields unexpected forces

 

Question #693898 on Yade changed:
https://answers.launchpad.net/yade/+question/693898

Luc Scholtès proposed the following answer:
Alright,

For 1), as suggested by Jerome, if you want to modify an existing
interaction stiffness, you need to add

i.phys.kn=valueYouWant

in your loop

#Set sphere state and interactions manually 'onJoint'

That's true for all properties of an existing interaction. The way you
did it only changed the properties on the particles, which will be taken
into consideration the next time an interaction is created with these
particles.

For 2), I am not sure to see the point of using a bond as a damping
tool... For instance, you could compact the assembly with a classic
frictional law using a high value of the non viscous damping coefficient
(defined in Newton integrator)? Now, assuming that you really want to
add cohesion between particles to compact the assembly , why define
jointed interactions to do that? You can simply define cohesive bonds
without the attribute "onJoint"... The onJoint attribute only makes
sense if you want to reorientate the contacts according one or several
predefined discontinuity planes (cf. smooth contact logic proposed in
[1,2]). If that's not the case, just define cohesion and/or tensile
strength between particles without changing the contact plane
orientation (without playing on the onJoint attribute).

Luc

[1] https://www.sciencedirect.com/science/article/pii/S1365160910002169
[2] https://www.sciencedirect.com/science/article/pii/S1365160912000391?via%3Dihub

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