> I have checked the relationship of the physical parameters and the > required parameters in Yade. I am confused how to get the shear > stiffness (tangential stiffness) from the poisson ratio and normal > stiffness correctly. You know, according to the description in > Vaclav's thesis page 52. I get the poisson ratio is not equal to the > Kt/Kn (shear stiffness/normal stiffness) directly. However, in > Ip2_2xCohFrictMat_CohFrictPhys, the shear stiffness is calculated just > from Kn*poisson ratio. You know, in PFC theory, the users always need > to give the shear stiffness directly. I know the poisson ratio (v) > depends on the dimensionless ratio Kn/Kt. But I don't know how to get > this formula (v=Kt/Kn). How to decide the coefficient?
Hi, the way to compute Kn/Kt depends on the Ip2 functor in use. In the case of the Cpm model which you refer to (page 52), I was directly specifying the Kn/Kt ratio in the CpmMat class (I call it G_over_E, but G/Kt=E/Kn), the ElastMat::poisson is not used at all. Admittedly, the ElastMat::poisson is quite confusing, maybe replacing it by the kt/kn ratio (ktDivKn) would be better. I think it is there for historical reasons, though other people might know better. Cheers, v _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
