Question #641619 on Yade changed:
https://answers.launchpad.net/yade/+question/641619
Status: Open => Answered
Jan Stránský proposed the following answer:
Hi Tina,
it strongly depends on the context. In uniaxial test, it is simply
strain = enlargement / original length
stress = force / area
There is more general formula to calculate stress, see [1,2]
In the case of three point bending, why do you need stress-strain?
Wouldn't force-displacement be enough? Probably you could
measure/compute stress-strain locally, but it is IMO not very meaningful
in the DEM case..
cheers
Jan
[1] https://yade-dem.org/doc/yade.utils.html#yade._utils.bodyStressTensors
[2] https://yade-dem.org/doc/yade.utils.html#yade._utils.getStress
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