New question #248246 on Yade:
https://answers.launchpad.net/yade/+question/248246
Hi,
I am trying to detect interaction forces when depositing an object of conical
shape into the soil.
For that purpose I use gravel material for soil and steel for object which is
made out of facets. These are the parameters I set up for soil and object,
respectively:
gravel =
O.materials.append(FrictMat(density=1602,young=120e6,poisson=.25,frictionAngle=.61))
stainless_steel =
O.materials.append(FrictMat(density=7740,young=180e9,poisson=.305,frictionAngle=.79))
This is how I set up engines:
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()], # handle
sphere+sphere and facet+sphere collisions
[Ip2_FrictMat_FrictMat_FrictPhys(frictAngle=None)],
[Law2_L3Geom_FrictPhys_ElPerfPl()]
),
NewtonIntegrator(gravity=(0,0,-9.81),damping=.3),
]
# set up time step
O.dt=.5*utils.PWaveTimeStep()
As for moving the object I use PyRunner and in every time step I change its
position.
When I try to move the object while in soil (with the aim of finding trajectory
with which minimum force would be exerted), the soil becomes unstable, and
particles move outside of the bounding box. Everything is ok if the deposition
is made as a straight line without any additional movements.
I would like to know why does this happen and how can it be fixed? Is it due to
high density of the object, high young modulus? What particular effect has
velocity of the object?
I would be very grateful for any further advices on this matter, since I am new
to Yade and the matter of soil behaviour and soil models in general.
Thank you,
Selma
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