>>> 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?
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