New question #264174 on Yade:
https://answers.launchpad.net/yade/+question/264174
Hi all!
I'm stilling studying parameters in CpmMat and FrictMat material types. In
the posted scipt below, a sphere labeled s1 is fixed at the origin. Another
sphere, s2, approaches and overlaps s1, and then moves along the z axis.
By doing this I want to know how the shear force varies over time between two
spheres.
However, I find that changing the poisson ratio from 1 to 20 has no effect on
the forces along the z axis in these simulations for both the CpmMat and
FrictMat. It seems that they are merely the verticle components of normal
stresses.
Another question is that when poisson ratio equals zero, s2 with FrictMat
would immediately disappear when the simulation starts. I wonder how this
happens.
from yade import plot
concreteId = O.materials.append(CpmMat(
young = 1,
frictionAngle = 0,
poisson = 0, #defines poisson ratio
relDuctility = 0,
sigmaT = 0,
epsCrackOnset = 1e-5 #low strain limit,
))
frictId = O.materials.append(FrictMat(
young=1,
frictionAngle = 0,
poisson = 1,
))
s1 = utils.sphere(center = (0,0,0), radius = 0.5, material = concreteId)
#assigns the material type
s2 = utils.sphere(center = (1,0,0), radius = 0.5, material = concreteId)
O.bodies.append([s1,s2])
s1.state.blockedDOFs = 'xyzXYZ' # holds s1 still
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb()], verletDist = 0),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom()],
[Ip2_CpmMat_CpmMat_CpmPhys(),
Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_CpmPhys_Cpm(),
Law2_ScGeom_FrictPhys_CundallStrack()],
),
NewtonIntegrator(damping=0.3),
PyRunner(command = 'addPlotData()', iterPeriod = 50),
PyRunner(command = Pushing(), iterPeriod = 1, label = ctr),
]
O.dt=5e-7*utils.PWaveTimeStep()
def addPlotData():
plot.addData(i=O.iter,
fz = O.forces.f(s2.id)[2], # z component of force
pz = s2.state.pos[2], # z coordinate
fx = O.forces.f(s2.id)[0], # x component of force
px = s2.state.pos[0], # x coordinate
)
def Pushing():
s2.state.vel = (-0.1,0,0) #lets s2 overlap s1
if s2.state.pos[0] 0.9:
ctr.command = Pushing2()
def Pushing2():
s2.state.vel = (0,0,0.1) #lets s2 move upward
ctr.command = Stop()
def Stop():
if s2.state.pos[2] 0.5:
O.pause()
plot.saveDataTxt('poisson=0.txt')
plot.plots = {'px' : ('fx'), 'pz':('fz')}
plot.plot()
Thanks!
--
You received this question notification because you are a member of
yade-users, which is an answer contact for Yade.
___
Mailing list: https://launchpad.net/~yade-users
Post to : yade-users@lists.launchpad.net
Unsubscribe : https://launchpad.net/~yade-users
More help : https://help.launchpad.net/ListHelp
