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[Chiara Modenese <question235934@xxxxxxxxxxxxxxxxxxxxx>]

Question #235934 on Yade changed:
https://answers.launchpad.net/yade/+question/235934

Chiara Modenese posted a new comment:
@Klaus
Yes, you are absolutely right and you refer to an excellent reference
(worth reading it for those interested in conctact models). However,
sometimes an analytical relationship is not possible to derive, such as in
the HM model.

@Bruno
At present I am not able to commit that part of the code but if somebody
follows my instruction it should be quick to do it.

All,
In my experience is not so critical to avoid tensile stresses due to
viscous damping as I have always found them to be negligible but it is a
good practice to neglect them entirely if possible. It is more of an issue
if we are modelling cohesive particles, as there you expect the cohesion to
match with your physical input.

Chiara


On 23 September 2013 11:16, Klaus Thoeni <
question235934@xxxxxxxxxxxxxxxxxxxxx> wrote:

> Question #235934 on Yade changed:
> https://answers.launchpad.net/yade/+question/235934
>
> Klaus Thoeni posted a new comment:
> > Yet, I wonder if people do not calibrate the restitution vs. viscosity
> > relation taking into account the tensile effects sometimes.
>
> At the end it depends what relation between the restitution coefficient
> and the
> viscous parameter is used. There is even a paper on this topic [1].
>
> Klaus
>
> [1] http://link.springer.com/article/10.1007/s10035-007-0065-z
>
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