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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