Aditional remark : the TriaxialTest can generate the packing THEN perform compression/traction test. You don't need to save/reload the simulation.
Bruno SHIU wenjie a écrit : > Hi Vaclav, > > I did get some pre-generated numerical specimens for uniaxial test and > triaxial test. I can send you some files later!!! Or you can even make the > specimen by yourself! I can explain the way that i use to do the "specimen > generation". > > I take the Triaxialtest as an example base, i just add some changes in this > class. > You can start from the radii expansion process to get a sphere assembly with > isotropic property. When the stability criteria is satisfied, saving the > position and the radius of all the spheres. And the specimen generation is > done!! Be care about the ratio between the stiffness of the spheres and the > target confinement. > > > How many spheres should we use?? Well, you can take 10000 spheres if you get > a powerful PC. Indeed, i did some uniaxial simulations, and i did not get > the size effect (between 2400 to 8000 spheres)!! > > And the problem about the dilatance when runing the triaxial test, I am > still trying to find out a solution!! It could be caused by the constitutive > law or many other factors!!! > > Regards > > wenjie > > ----- Original Message ----- > From: "Václav Smilauer" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Wednesday, November 28, 2007 1:21 PM > Subject: [Yade-users] reference sphere assembly > > > >> I would like to calibrate material parameters to match macroscopic >> properties using uniaxial traction and later triaxial compression tests. >> Is there some widely used, pre-generated sphere assmebly that has >> properties such as isotropy and "reasonable" radii variance that could >> be used? (Something like that should be part of Yade, I think). >> >> If no, what procedures to you recommend to create such assembly? How >> many sphere should I go for? >> >> I will work soon on triax test which will have "true" hydrostatic >> confinement (by using delaunay to detect the solid edge and applying >> forces at relevant spheres) - that will solve the problem of restricted >> dilatance for triax (right, Wenjie?). >> >> Regards, Vaclav >> _______________________________________________ >> Yade-users mailing list >> [email protected] >> https://lists.berlios.de/mailman/listinfo/yade-users >> > > _______________________________________________ > Yade-users mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/yade-users > > -- _______________ Chareyre Bruno Maitre de conference Institut National Polytechnique de Grenoble Laboratoire 3S (Soils Solids Structures) - bureau E145 BP 53 - 38041, Grenoble cedex 9 - France Tél : 33 4 56 52 86 21 Fax : 33 4 76 82 70 00 ________________ _______________________________________________ Yade-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/yade-users
