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[xuelong14 <question392660@xxxxxxxxxxxxxxxxxxxxx>]

Question #392660 on Yade changed:
https://answers.launchpad.net/yade/+question/392660

xuelong14 gave more information on the question:
Thank you very much for your answer !
I really used the numerical damping in my model .
The reason why I want to use this contact law is that the contact law is very simple but it can reflect the most important feature ---friction--- of sand. In the meantime, I have made a lot of numerical tests about it and I have gain a lot of experience in specifying the parametres of it .
Yesterday, I checked my codes again and found a big bug in it and thus the problem I faced was solved.
Many thanks for your time !
However, in PFC, there really do exist beta_s in the linear elastic model and I am really not sure about whether the beta_s should be added or not. In my mind, the "collision" in the tangential direction is really the same as the collision in the normal direction. So why there shouldn't be a mechanism of dissipating energy when the sliding don't happen but the "collision" in the tangential direction takes place.

Long Xue





At 2016-09-14 19:22:52, "Klaus Thoeni" <question392660@xxxxxxxxxxxxxxxxxxxxx> wrote:
>Your question #392660 on Yade changed:
>https://answers.launchpad.net/yade/+question/392660
>
>Klaus Thoeni posted a new comment:
>Hi,
>
>I still think this is not the contact law you want to use for triax
>tests as it was designed for rock impacts. Other contact laws provide
>much more features. In the case of a triax test you would also be able
>to use Newton.damping as it is shown in the example [1].
>
>By saying that, it is also possible for me to implement betas. It might
>just take some time as I have to set up  everything from scratch.
>
>Another question, why do you want to use this contact law? What feature
>is crucial?
>
>Klaus
>
>[1] https://github.com/yade/trunk/blob/master/examples/triax-tutorial
>/script-session1.py#L94
>
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