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[Jan Stránský <question259110@xxxxxxxxxxxxxxxxxxxxx>]

Question #259110 on Yade changed:
https://answers.launchpad.net/yade/+question/259110

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Christopher,


>
> Some of my co-workers have been running experiments in which a group of
> spherical particles is exerting forces on a facet. Ideally, the stress on a
> body should equal the force on the body per unit area. However, in our
> experiments, we have found a large discrepancy between stress and
> (force*area). The product of force and area in one of our facet tests was
> 18 kN, while the stress recorded for the same facet was 66 kN.
>

please try to be more consistent in your stress, force and physical unit
relations (e.g. "discrepancy between stress and (force*area)" - should be
stress and force/area? or stress = .. kN - should be kPa?)

You can have a look on the implementation in the source code, personally I
am a bit confused by it so I would rely more on force/area :-)


>
> What could be the cause of the discrepancy? How exactly does the
> VTKRecorder (I presume this is the engine used) calculate the force values
> it sends to ParaView?
>

forces are exported correctly, I am not sure with stresses..


cheers
Jan

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