Question #654408 on Yade changed: https://answers.launchpad.net/yade/+question/654408
Bruno Chareyre posted a new comment: >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? If I understand correctly it needs a fix, and the fix is simply to take maxFs=max(0,maxFs). >1 - is it the expected behaviour that negative (tensile) normal forces decrease the shear resistance of the interaction? Expected by the author of these lines, yes, probably. As Robert suggests it is a conventional Mohr-Coulomb condition. More generally, it is just a constitutive assumption, and as such it is not right nor wrong in a general sense. In PFC the assumption is(*) more to take friction OR adhesion, without summing them at any point. Just another assumption. Bruno (*) or "was", at least, years ago. -- You received this question notification because your team yade-users is an answer contact for Yade. _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
