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[Question #688116]: Is it possible to make bonded particles share the same velocity when using JCFpm?

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From: jasperb <question688116@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 20 Jan 2020 05:23:29 -0000
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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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