yade-dev team mailing list archive

[chiara modenese <c.modenese@xxxxxxxxx>]

2010/4/8 Václav Šmilauer <eudoxos@xxxxxxxx>

> > I need the incremental formulation for the normal force in the contact
> > law. Could you tell me how to do that? Should I simply used the
> > normalVelocity component computed at contact as we do for the shear
> > force? What about the sign convention? Should it remain the same,
> > right?
> Using relative velocity (it will be much easier than for shear, since it
> is 1D) would be the simplest, it seems.
>
> Or if you want to go more precise, you could store previous normal
> deformation, then compute the current one (total formulation), divide by
> Δt to get increment and add it to previous incremental normal
> deformation... Perhaps too complicated...
>

Hi,
if I get the incremental displacement in the normal direction as

dU(t+dt) = U(t+dt)-U(t)

where U(t+dt) and U(t) are total formulation, it is fine or should I take
into account the rotation of the normal?
(btw, it is the incremental formulation that will permit me to calculate the
potential elastic energy for the non linear elastic Hertz formulation in the
normal direction..)

thanks, Chiara


>
> Cheers, v.
>
>
>
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