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[Hélvio Peixoto <question654408@xxxxxxxxxxxxxxxxxxxxx>]

Question #654408 on Yade changed:
https://answers.launchpad.net/yade/+question/654408

    Status: Answered => Open

Hélvio Peixoto is still having a problem:
Robert,

thanks for clarifying that the reduction of the maximum allowable shear
force is possible. I was aware of article [1], and was looking for
confirmation.

As to my question 2-, maybe I wasn't clear enough. I will try to
reformulate the question:

We already agreed that it is possible, and expected, that Fn assume
negative values. Being that the case (Fn<0), then at line 144 [2] maxFs
will be negative when |Fn*phys->tanFrictionAngle| > |phys->FsMax|. If
maxFs is negative, then it will cause a shear failure, as in line 147[3]
maxFs is compared against a vector norm (scalarShearForce), that is
always positive. Should this be allowed to occur, I mean, a negative
maxFs?

Cherrs,

Hélvio

[1]Scholtès, L., & Donzé, F.-V. (2012). Modelling progressive failure in fractured rock masses using a 3D discrete element method. International Journal of Rock Mechanics and Mining Sciences, 52, 18–30. http://doi.org/10.1016/j.ijrmms.2012.02.009
[2]https://github.com/yade/trunk/blob/master/pkg/dem/JointedCohesiveFrictionalPM.cpp#L144
[3]https://github.com/yade/trunk/blob/master/pkg/dem/JointedCohesiveFrictionalPM.cpp#L147

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