the Calculation theroy of Normal Stress in file Sphere.vtu

Hi,
There are many ways to "export".
Could you be more precise on what you are doing?

Bruno

Hi,

https://github.com/yade/trunk/blob/master/pkg/dem/Shop.cpp#L579

Cheers,

Anton

2013/6/17 林夏 <email address hidden>:
> New question #230881 on Yade:
> https://answers.launchpad.net/yade/+question/230881
>
> Hello everyone，
>
> I did one simulation and export the result files.
>
> And I found there is a "normal Stress" viable
> in the file sphere.vtu for every sphere.
>
> But can anybody tell me or give me some references
> on How to Calculate the Normal Stress in discrete element method ?
> Or how does Yade calculate it?
>
> Thanks a lot!
>
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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)