Question #690066 on Yade changed:
https://answers.launchpad.net/yade/+question/690066
Status: Open => Needs information
Jan Stránský requested more information:
> F_n = function1 of (normal strain rate, ...)
> F_t = function2 of (tangential strain rate, ..)
this is already clear from from the original post :-) I think the discussion
needs more information on this.
Is it possible to provide more details, like a specific formula, on what other
quantities the result depend etc.?
> and tangential direction is defined according to the relative velocity
of the particles at the contact....
What is "the relative velocity of the particles at the contact"?
something else then geom.incidentVel and geom.shearIncrement (or their
strain rate or velocity counterparts)?
> Now, If I want to use O.forces, I need to convert these components F_n
and F_t in global coordinates.
Depending on the meaning of "components F_n and F_t" (??):
1) normal + shear components, simply:
F = F_n + F_t
2) shear components
you don't (shouldn't) need to convert anything. You have all variables as
vectors in global coordinate system, O.forces are vectors in global coordinate
system, so just compute with vectors in global coordinate system (that's why I
require more info on actual computation, I don't see here any use case where
shear components would be needed)
> I don't see how I can avoid that task thanks to a vectorial
relationship in my case !!
The vectorial relationshop is actually the way to avoid it..
> ...Just wanted to know if there was an easy way (functions) to compute
that in yade.. ??
see above
waiting for more info
cheers
Jan
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