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[Bruno Chareyre <question230881@xxxxxxxxxxxxxxxxxxxxx>]

Question #230881 on Yade changed:
https://answers.launchpad.net/yade/+question/230881

Bruno Chareyre proposed the following answer:
Ok, I think I found it. 
Probably using Shop::getStressForEachBody, which is an average of an equivalent stress evaluated for each interaction with the body.
It is not a very well defined stress quantity I'm afraid, although it can still indicate where stress is high or low.
There are well defined stress measures in Yade that can be used if you are interested.

For instance:
S=bodyStressTensors()
[1] https://yade-dem.org/doc/yade.utils.html?highlight=bodystress#yade._utils.bodyStressTensors
[2] http://arxiv.org/pdf/1304.4895.pdf (section 3.2)

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