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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:
Hi Chiara,

the point is, that there is no branch vector in my solution :-) or that
"branch" vector is computed as x = contactPoint - center, see "x" in [1].
For the spherical case, it coincides with half branch vector, but is more
general (e.g. for the clump case, where you do not have branch vectors in
the  "classical" Yade sense).

The solution proposed by Ning is nice and is exact for the cases, where the
contact point is located on the line (clump1->pos -- clump2->pos), but in
general case this is not true and trherefore it violates the assumptions of
the derivation.

Thanks for the discussion
Jan

[1] https://yade-
dem.org/doc/yade.utils.html#yade._utils.bodyStressTensors


2012/12/18 Chiara Modenese <question206415@xxxxxxxxxxxxxxxxxxxxx>

> Question #206415 on Yade changed:
> https://answers.launchpad.net/yade/+question/206415
>
> Chiara Modenese proposed the following answer:
> @Ning
> Your proposed solution looks fine to me. Are you planning to commit it?
>
> @Jan
> How do you define the branch vector in your case? Can you clarify your
> suggestion please?
>
> Chiara
>
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