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[Jan Stránský <question206415@xxxxxxxxxxxxxxxxxxxxx>]

Question #206415 on Yade changed:
https://answers.launchpad.net/yade/+question/206415

Jan Stránský proposed the following answer:
Hello,

for some reason I was discussing one particle.. In the case of periodic
cell, the approach proposed by you is of course ok :-)
Sorry for misunderstanding
Jan


2012/12/18 ceguo <question206415@xxxxxxxxxxxxxxxxxxxxx>

> Question #206415 on Yade changed:
> https://answers.launchpad.net/yade/+question/206415
>
> ceguo posted a new comment:
> Yes, for calculating body stress per particle, the contact point position
> should be used.
> While for the calculation of homogenized bulk stress, the use of branch
> vector (connecting clumps centres) is appropriate. Actually the branch
> vector is defined as the connection between centroids of two particles in
> contact. See (H. Ouadfel, L. Rothenburg, 2001, Mech. Mater.). In their case
> using ellipsoidal particles, the contact points are mostly NOT aligned on
> the branch vector.
>
> Ning
>
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