Hi Morteza, you have to define your own material parameters, that is explaind in the user's manual (https://www.yade-dem.org/sphinx/user.html#defining-materials). By virtue of appropriate Ip2 functors, they will determine stiffnesses of interactions. By default, https://www.yade-dem.org/sphinx/yade.utils.html#yade.utils.defaultMaterial is used if no material is defined; the default material is not meant to represent something, but to avoid defining material in short scripts where you only want to test something not related to material properties.
HTH, Václav > Hi everybody. > > I’m working on ball mills. I want to know how I can define > normal stiffness & shear stiffness in yade? And what's > definition of normal stiffness & shear stiffness in yade in > defult? > > I woud be grateful if you can help me. > > > > > > > > > _______________________________________________ > Mailing list: https://launchpad.net/~yade-users > Post to : [email protected] > Unsubscribe : https://launchpad.net/~yade-users > More help : https://help.launchpad.net/ListHelp -- Vaclav Smilauer <[email protected]> _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp

