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question on damping used for instance in the Triaxial Test. Is it right
that the solution is affected by the damping? Cause is what happens.
Yes in general. No, in special cases (quasistatic process).
You can obtain the "same"(*) stress-strain behaviour with different
(*) In fact "almost" the same, which can make a big difference in
damping included in the NewIntegrator class acts as a global damping, right?
If I want to use the local damping I see that I should use the
ViscousForceDamping class. In such case whatever else should I adopt for the
part related to the integration algorithm and Newton force law?
Put damping=0 in the latest.
Cause I see
that NewtonIntegrator includes everything on this side.
Last question: Should
the damping helping to reach the equilibrium at each time step?
When I include
the damping should I expect a decreasing in the total number of iterations?
It's all a question of numerical experimentation. In the triaxial test
in general, you will not really reduce the number of iterations with a
strong damping, except perhaps in the first iterations when you compress
the gaz cloud.
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From: Chiara Modenese, 2009-12-16