yade-dev team mailing list archive

["Sergei D." <sj2001@xxxxxxxxx>]

>>> Yes, en and es are normal and tangential coefficients of restitution
>>> (ratio of velocities after and before the 'impact': vf/vi).
>>> I wanted to say that the parameters in
>>> SimpleViscoelasticBodyParameters could be the stiffnesses and
>>> restitution coefficients. Then, the effective mass together with the
>>> viscous constants could be determined in
>>> SimpleViscoelasticRelationships (maybe with the equations you showed
>>> me).
>> I do not quite understand the idea. At this point,
>> SimpleViscoelasticBodyParameters contains the viscoelastic parameters of
>> a single body, i.e. its stiffnesses and viscosity.
>> SimpleViscoelasticRelationships  defines the effective  parameters of
>> interaction between two different viscoelastic bodies (by analogy with
>> the effective Young's modulus).
>
> Precisely, the effective mass (for a given contact) is not computed in
> SimpleViscoelasticRelationships. So cn can be larger than the critical
> value for this contact. You agree?
>
What is the critical value?