Question #658902 on Yade changed: https://answers.launchpad.net/yade/+question/658902
Status: Open => Answered Luc Scholtès proposed the following answer: Hello, Here are some answers: 1) and 2): calibration of DEM models is a difficult task if you want it to be relevant. Many DEM/BPM users often underestimate the calibration process which has to be done considering as much loading paths as possible: - uniaxial tension test -> elastic properties and uniaxial tensile strength (some people might want to simulate brazilian tests so as to compare directly with lab experiments) - uniaxial compression test -> elastic properties (must be the same as in uniaxial tension) and uniaxial compressive strength - triaxial compression tests at several confining pressure -> failure envelope Please have a look at [1] where a calibration procedure is explained (I insist on the fact that this is A calibration procedure and not THE calibration procedure). Also, you will see in that paper that every microproperty of the JCFPM are related to given macroscopic properties. Of course, as usual for DEM model, it is a matter of trials and errors to identify the right set of microproperties. There is no direct mathematical relationship between micro and macro properties (unless you work with regular packings...). 3) I don't remember performing a biaxial test for that paper... I remember performing a uniaxial compressive test on a sample with a pre- existing crack and a direct shear test on a sample with several pre- existing cracks. I guess you are referring to the direct shear test. The procedure is exactly the same that you would use in the lab: normal loading through top moving plate and bottom fixed plate and then, after reaching the desired normal load, shearing with the help of lateral walls (Casagrande box type). Please have a look at this thread: https://www.mail-archive.com/yade- us...@lists.launchpad.net/msg05815.html Luc - [1]: Scholtès, L., Donzé, F.V. (2013), A DEM model for soft and hard rocks: role of grain interlocking on strength. Journal of the Mechanics and Physics of Solids (61), pages 352–369. -- 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 : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp