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[Jérôme Duriez <question586294@xxxxxxxxxxxxxxxxxxxxx>]

Question #586294 on Yade changed:
https://answers.launchpad.net/yade/+question/586294

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hi,

I guess we will need more background information here, especially with
regards to your contact model. Since you speak about traction, I guess
you deal with cohesive interactions. Also, what kind of traction are you
referring to ? Uniaxial tension test ? or something else ? (see below..)

With cohesive interactions, uniaxial tension test could be imposed
easily on e.g. a classical parallelepipedic sample by directly moving a
selection of "non-dynamic" particles at the sample ends: if you want
impose a uniaxial tension test along y axis, take the particles close to
yMin and yMax for instance (and you may also choose to let these
particles be "dynamic" along x and z directions).

If you wish, you may also strengthen manually the cohesive properties of
the interactions between these particles and the rest of the sample, to
be sure that fracture initiates within the sample, and not just close to
the controlled boundaries.

That's the method we used in Duriez2016a [*] (where you won't find more
details about the numerical procedure, though..)


Now I wrote all this I'm just realizing you may also refer just to traction vector i.e. stress components.... In this case TriaxialStressController actually is also perfect to apply uniform (there is only one value....) stress components, see goal1,2,3 and stressMask attributes, the example scripts, and all triaxial test simulations done with Yade....

Jerome

[*] from https://www.yade-dem.org/doc/publications.html

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