New question #688719 on Yade:
https://answers.launchpad.net/yade/+question/688719
>From this code I want to have a square that can be sized Crush the particles.
>By determining the force , What should I do ?
from __future__ import print_function
from yade import pack
from pylab import rand
from yade import qt
O.periodic=True
length=0.4
height=0.6
width=0.2
thickness=0.01
O.cell.hSize=Matrix3(length, 0, 0,
0 ,3.*height, 0,
0, 0, width)
O.materials.append(FrictMat(density=1,young=1e5,poisson=0.3,frictionAngle=radians(30),label='boxMat'))
lowBox = box( center=(length/2.0,height-thickness/2.0,width/2.0),
extents=(length*1000.0,thickness/2.0,width*1000.0) ,fixed=True,wire=False)
O.bodies.append(lowBox)
radius=0.01
O.materials.append(FrictMat(density=1000,young=1e4,poisson=0.3,frictionAngle=radians(30),label='sphereMat'))
sp=pack.SpherePack()
sp.makeCloud((0.*length,height+1.2*radius,0.25*width),(0.5*length,2*height-1.2*radius,0.75*width),-1,.2,2000,periodic=True)
O.bodies.append([sphere(s[0],s[1],color=(0.6+0.15*rand(),0.5+0.15*rand(),0.15+0.15*rand()))
for s in sp])
O.dt=0.2*PWaveTimeStep()
O.usesTimeStepper=True
newton=NewtonIntegrator(damping=0.6,gravity=(0,-10,0))
O.engines=[
ForceResetter(),
#(1) This is where we allow big bodies, else it would crash due to the
very large bottom box:
InsertionSortCollider([Bo1_Box_Aabb(),Bo1_Sphere_Aabb()],allowBiggerThanPeriod=True),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
GlobalStiffnessTimeStepper(timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8,defaultDt=O.dt),
newton
]
Gl1_Sphere.stripes=1
from yade import qt
qt.View()
print('Press PLAY button')
Video from the code
https://www.youtube.com/watch?v=_SeA5KDzxpg&feature=youtu.be
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