yade-dev team mailing list archive

[Chiara Modenese <c.modenese@xxxxxxxxx>]

On 1 March 2011 15:40, Vincent Richefeu <richefeu@xxxxxxxxx> wrote:

> For instance. if you have f_n = f_elas + f_coh + f_visc, you can say:
>
> (1) f_n is even positive or negative, so sigma = sigma^+ + sigma^-
> (2) f_n results in 3 contributions, so sigma = sigma^elas + sigma^coh +
> sigma^visc (and I guess sigma^visc is about 0...)
>
Thanks for answer, Vincent. I think I am in the second case, though I also
expect little contribution from viscous forces.
Chiara

>
> Vincent
>
> Le 1 mars 2011 à 12:21, Chiara Modenese a écrit :
>
> Ok, then I would have a new question for you. I was thinking to apply
> Vincent's suggestion to plot fabric tensor considered as the sum of two
> contributions (which is already in code), one due to negative forces and the
> other to positive ones. The distinction could be made if one uses cohesive
> contacts, for instance. Say that you also include viscous damping, then you
> will not be able to distinguish between the contribution only due to
> cohesion since also damping, in fact, could change the sign of the forces.
> Vincent, do you have any other hint in this regard? Or maybe I could store
> the viscous and the spring force into two distinct vectors and play with
> that?
>
> Thanks. Chiara
>
>
> On 1 March 2011 09:49, Chiara Modenese <c.modenese@xxxxxxxxx> wrote:
>
>> Ok, I think I know why now. I mean, since I have viscous forces stored
>> into normalForce that could be the cause.
>> Cheers. Chiara
>>
>>
>> On 28 February 2011 21:02, Chiara Modenese <c.modenese@xxxxxxxxx> wrote:
>>
>>> Hi Guys,
>>>
>>> small question. I was trying to plot normal force versus overlapping of
>>> all my interactions. For the normal force I want to keep the sign and so I
>>> simply project it onto the corresponding normal vector something like:
>>> Fn=i.phys.normalForce.dot(i.geom.normal). The problem is that, without
>>> adhesion and according to a certain convention, I expect forces all of the
>>> same sign whereas I sometimes record opposite ones. A problem in my script
>>> or why does that happen?
>>>
>>> Thanks, Chiara
>>>
>>
>>
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