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[Jérôme Duriez <question284255@xxxxxxxxxxxxxxxxxxxxx>]

Question #284255 on Yade changed:
https://answers.launchpad.net/yade/+question/284255

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Did you mean that the stresses (or the strais ?) were zero with the following sentence:
"when I have tried to plot stress - strain graphs in all direction they were zero"

If your'e speaking about stresses, zero stresses means no internal
forces, and the reason is most probably that you're currently
compressing a gas (or something even softer), which does not require too
much effort.

The reason for that is your sample definition lies in one command line:
"sp.makeCloud(...)"
This command generates something like a particle gas: a set of particles with no contacts between them
=> you can stretch the bounding box for a while without any stress.

A search for "makeCloud" in the previous Launchpad questions/answers
will help you to get the method to define a solid-like packing. The
"triax-tutorial" scripts would also help, see e.g.
https://github.com/yade/trunk/tree/master/examples/triax-tutorial

Jerome

PS: it's true the doc of makeCloud definitely needs some modfications,
you're not the first one misunderstanding this function...

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