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[Alexander <question271097@xxxxxxxxxxxxxxxxxxxxx>]

Question #271097 on Yade changed:
https://answers.launchpad.net/yade/+question/271097

    Status: Answered => Open

Alexander is still having a problem:
Hi Bruno, thanks for your response.

I read [1], but some things are unclear yet. First lets consider just
normal contact.

So am'i right in the following considerations:

1) As i understand to compute new position of particle we need to know
the result force. The formula for normal force is following
F_n=min(k_n*u_n, a_n).

2) So if u_n < 0 then non-cohesion contact is active,  and the vector of
force is directed from the particle (F = k_n*u_n  < 0, k_n - normal
stiffness coeff.)

3) if u_n > 0 then cohesion contact is active and the vector of force is
directed toward the particle (F = k_n*u_n  > 0). Also the parameter a_n
shows the maximum cohesion force which could be exists between
particles. if F = k_n*u_n > a_n then the cohesive bound breaks (a_n set
to zero) and only non-cohesive contact left.

4) Modulus of cohesive force grows if particles  moving away, and
modulus of non-cohesive force grows if  particles  coming closer.


4) The cohesive bounds are created only at the beginning of the simulation and Yade understands which particles are connected via interaction_radius parameter.

5) New cohesive bounds don't appear during simulation if one doesn't do
it specially.

with regards, Alexander

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