New question #688116 on Yade:
https://answers.launchpad.net/yade/+question/688116


Hi there,

Recently I am using JCFpm to model a cluster of bonded spheres(bond strength is 
randomly assigned) impacting a layer of fixed spheres.
1. My first question is that after the impact, the member sphere of the cluster 
demonstrates a wide range of rebound velocity(from 1m/s to 8m/s) even when they 
are bonded together. My understanding is that, different from BPM where 
constraint is added so that large difference in two bonded particles' motion is 
prevented, JCFpm allows deformation and relative displacement of two bonded 
particles so long as the critical force is not reached. However, my idea is 
that as a rigid rock, its member particles should better have identical 
velocity once they are bonded. I am wondering whether it is feasible to make 
the bonded particles in the cluster have the same ( or not quite different) 
velocity?

2. My second question is that the bond break criterion seems to only consider 
the tensile and shear failure. Why torque is ignored and is such practice 
making sense?

Cheers,
Jasper

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