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[Robert Caulk <question692713@xxxxxxxxxxxxxxxxxxxxx>]

Question #692713 on Yade changed:
https://answers.launchpad.net/yade/+question/692713

    Status: Open => Answered

Robert Caulk proposed the following answer:
>  it says alphaKr and alphaKtw are dimensionless rolling(bending)
stiffness and twisting stiffness, respectively.

Imagine a beam connecting your two particles. If both particles roll
along their shared axis, we install a spring that will resist this
motion. alphaKr is the stiffness of that spring. Similarly, if the two
particles twist along their shared axis, we install a spring that will
resist this motion. alphaKtw is the stiffness of that spring.

> I have no idea how much the values are proper for granite

Unless you can find a paper that has calibrated these parameters for a
similar material and similar scale (super important) that you are after
- they don't directly correspond to any macroscopic conintuum mechanics
parameters. Thus, these are calibrative. Like most DEM microparameters
:-).

You are welcome to look at the source code to see exact implementation,
if it will help you understand [1].

Cheers,

Robert

[1]https://gitlab.com/yade-
dev/trunk/-/blob/master/pkg/dem/CohesiveFrictionalContactLaw.cpp#L199

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