Hi, Chiara verecently I realized, that when I do uniaxial tests and have friction between "press" and spheres, results are very unstable. When friction between spheres and press is 0, all is ok.
http://www.mail-archive.com/[email protected]/msg01656.html Maybe, it is your case also. Anton 2010/8/20 chiara modenese <[email protected]> > Hi, > > OK I found where is the problem. Please see the two attached figures (for > people interested in the topic see the previous post in this thread). In one > case I include friction between balls and boxes, in the other only between > balls. Energy is conserved even if the simulation is _dynamic_ (good news), > the problem is present only if there is friction between balls and boxes. > Please I need your help to understand if this is a bug. > > So question for everyone: > What is the difference in terms of computation of the shear behavior > between a box-sphere interaction and a sphere-sphere interaction? > > Thanks a lot. > > Chiara > > > > On 12 July 2010 17:26, Bruno Chareyre <[email protected]> wrote: > >> >> Chiara, I found a problem in the script you use for comparing energies in >> bouncing spheres. >> The line O.materials[0].frictionAngle=radians(25) is changing value in the >> material but it is not reflecting everything automaticaly in interactions >> (tangent of friction is still 0 in the contact law, but radians(25) is used >> for computing energy, so...). >> By using TriaxialCompressionEngine().setContactProperties(radians(25)) >> instead, I get something better. Total energy is still increasing, but at >> least it will stagnate at a point. >> >> Bruno >> >> >> _______________________________________________ >> Mailing list: >> https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users> >> Post to : [email protected] >> Unsubscribe : >> https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users> >> More help : https://help.launchpad.net/ListHelp >> >> > > _______________________________________________ > Mailing list: > https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users> > Post to : [email protected] > Unsubscribe : > https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users> > More help : https://help.launchpad.net/ListHelp > >
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