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[Luc Sibille <question688439@xxxxxxxxxxxxxxxxxxxxx>]

Question #688439 on Yade changed:
https://answers.launchpad.net/yade/+question/688439

Luc Sibille proposed the following answer:


> But my problem is about the amount of peak friction angle before considering rolling stiffness (I mean without considering CohesionMomment)  and after that. when I use just FrictPhys_CundallStrack as  the contact law, with the Inter-Particle friction angle of 30 degree, I can't get peak friction angle of experimental data  that is about 40 degree.
This is a classical result: with spherical particles and without rolling 
resistance, internal peak friction angle relatively high (typically 40 
deg) cannot be reproduced.
> Because of this problem, I tried to model a sample with more stiffness until getting more peak friction angle. After using CohesionMoment and setting alpaKr (for example alphaKr=0.5 or 1), I couldn't see any changes.
Again, stiffnesses, as normal, tangential or rolling stiffnesses, if 
their are chosen sufficient high should not affect the failure 
properties as the peak friction angle. So it may be normal that peak 
friction angle is not affected by such stiffnesses. Then peak friction 
angle is more strongly affected by the contact friction angle and 
plastic rolling moment coefficient (or rolling friction coefficient) 
etaRoll (and not alphaKr).

Besides, be sure that the rolling resistance is activated. It is not 
because you use Law2_ScGeom6D_CohFrictPhys_CohesionMoment that rolling 
resistance is necessarily activated: rolling resistance can be enable or 
disable depending on some arguments in 
Law2_ScGeom6D_CohFrictPhys_CohesionMoment and/or CohFrictMat

Luc

-- 
Luc Sibille
Université Grenoble Alpes / IUT1 de Grenoble
Laboratoire 3SR: Sols, Solides, Structures, Risques

Tel lab.: +33 (0)4 76 82 63 48
Tel IUT: +33 (0)4 76 82 53 36

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