Question #197661 on Yade changed:
https://answers.launchpad.net/yade/+question/197661
Status: Answered => Open
wangxiaoliang is still having a problem:
Hi Luc,
I know change friction angle using either your technique or Chareyre's
are ok, but it is for FrictMat.
Now I am using Moment Material and Moment Law, changing kn ks eta and
beta result same response using your technique,
I don't know why. My code is below
O.load('consolidated_state_'+key+'_'+str(phi)+'.xml')
# we add new materials to our material container
O.materials.append(MomentMat(eta=eyta,young=young,poisson=0.1,frictionAngle=radians(fricFinal),density=2600,label='spheres-moment'))
O.materials.append(MomentMat(eta=0.0,young=young,poisson=0.1,frictionAngle=0,density=0,label='walls-moment'))
# here we modify the material and interaction physics
for i_body in O.bodies:
if i_body.id < 6 :
i_body.material = O.materials[3]
else:
i_body.material = O.materials[2]
for i_interactions in O.interactions:
if i_interactions.id1 > 5 and i_interactions.id2 > 5:
i_interactions.Eta = eyta # only interaction between
particles are changed to eyta > 0
#here we move to modify the interaction loop
Interaction = O.engines[2]
Interaction = InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
[Ip2_MomentMat_MomentMat_MomentPhys(Knormal=knormal,Alpha =
alpha,Beta=beta,useAlphaBeta=True,userInputStiffness=True)],
[Law2_SCG_MomentPhys_CohesionlessMomentRotation()]
)
# here we redifine the triaxial engine
triax=O.engines[4] #redifine 3d triaxial engine
##We move to deviatoric loading, let us turn internal compaction off to
keep particles sizes constant
triax.internalCompaction=False
## Change contact friction (remember that decreasing it would generate
instantaneous instabilities)
triax.setContactProperties(fricFinal)
this statement "i_interactions.Eta = eyta" doesn't change eta in
interaction physics, but I think it should change.
Here we have parameters in this function below, doesn't this function
change kn, ks beta in interaction physics?
[Ip2_MomentMat_MomentMat_MomentPhys(Knormal=knormal,Alpha =
alpha,Beta=beta,useAlphaBeta=True,userInputStiffness=True)],
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