Question #172107 on Yade changed: https://answers.launchpad.net/yade/+question/172107
Chareyre proposed the following answer: @Viet, there is no relation with the number of particles. The equations are exact be it with 1 particle (example below). I finally checked on my side... I don't know how you crunch the numbers guys, but you surely compute something the wrong way. Here are my numbers with 1 particle (I got to decrease the time-step, else the stress control is a bit lost with only 1 sphere...): step 0: porosity= 0.720940373948968 step 40: porosity=0.594615817413609, e11=0.125334930132997, e22=0.155608210807015, e33=0.0924666030771256 ln(de/(1+e0)) gives -0.37340974 vs. e11+e22+e33 gives 0.373409744 Hurray! No matter overlaps, number of particles, or large strains. Strain values are exact, modulo computer precision. Try to do your calculations with my numbers and let's see if we find the same results. Note that the strain values given by the triaxial engines are true strains (sorry if it was not clear in my previous post), you don't have to compute the log on your side. It also means that we are not obliged to reset strain after isotropic compaction: since the strain is always exact we can simply substract strains from the different stages to define strains in one given stage. -- You received this question notification because you are a member of yade-users, which 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
