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[Bruno Chareyre <question672563@xxxxxxxxxxxxxxxxxxxxx>]

Question #672563 on Yade changed:
https://answers.launchpad.net/yade/+question/672563

Bruno Chareyre proposed the following answer:
>the biperiodic configuration where the sample is sandwiched in between
2 moving plates corresponds to a direct shear test...

Direct shear refers to the (inhomogeneous) shear box for soils, or a sheared rock joint.
The yade's preprocessor "SimpleShear" is badly named, btw, since it simulates a direct shear.
Rotational shear is not homogeneous, although it does not impose the position of the shear band as firmly as direct shear.

Conversely, the periodic BCs define simple shear (homogeneous). Only
very specific devices (e.g. 1γ2ε in Grenoble) can do such thing in
practice.

>  you could try to apply a rotation to the top plate with the centre of
rotation located either the centre of the sample or offset from it so as
to mimic your experiment...

Nope. Such a rotational field is not periodic, the simulation would just
go weird. It is not possible to use periodic BCs for rotational shear
(unless someone implements periodicity for annular geometries, which is
not straightforward).

Bruno

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