← Back to team overview

yade-users team mailing list archive

[Question #693631]: Ip2_CohFrictMat_CohFrictMat_CohFrictPhys

 

New question #693631 on Yade:
https://answers.launchpad.net/yade/+question/693631

As we all know, Ip2 class is used to set the interactions for the particles. 

Ip2_CohFrictMat_CohFrictMat_CohFrictPhys() is one of the Ip2 classes.

for this Ip2:  CohFrictMat is the material properties for the sphere particles [1]
For instance, I can set the material properties like this: 
sphereMat=O.materials.append(CohFrictMat(young=young,poisson=0.3,frictionAngle=radians(finalcompFricDegree),isCohesive=False,alphaKr=0.2,alphaKtw=0,etaRoll=0.5,momentRotationLaw=True,density=2648))
############################################################
 If I only search for this part: CohFrictPhys [2]  (class yade.wrapper.CohFrictPhys). Under this class, there are some properties, for example, kn, ks, kr, etc.. 
############################################
If I only search for the whole class: (  Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()  )[3] .Under this class, there is one parameter which is named: frictAngle
################################################
################################################
Here are my questions:
[1] 
################################
young=4e8
finalcompFricDegree=19.5
sphereMat=O.materials.append(CohFrictMat(young=young,poisson=0.3,frictionAngle=radians(finalcompFricDegree),isCohesive=False,alphaKr=0.2,alphaKtw=0,etaRoll=0.5,momentRotationLaw=True,density=2648))   #####(material properties)
###############
O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
	InteractionLoop(
			[Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Facet_Sphere_ScGeom()],
			[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys()],
					[Law2_ScGeom6D_CohFrictPhys_CohesionMoment(useIncrementalForm=True,always_use_moment_law=True,label='cohesiveLaw')]
	),
	GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=10,timestepSafetyCoefficient=0.8),
	NewtonIntegrator(gravity=(0,0,-9.81),damping=0.0),
##################################
If I set the material properties by the code above (sphereMat).
What is the function of the CohFrictPhys?? (Here, I mean if we set the sphere's material properties by CohFrictMat. How can we use the properties under the CohFrictPhys?? <For example, where should I add the kn, ks, kr during the simulation?>)
####################################################################
2: If I set the frictionangle in CohFrictMat, what is the purpose of the frictAngle in Ip2 class?
For instance, if I set this class like this: Ip2_CohFrictMat_CohFrictMat_CohFrictPhys (frictAngle = 30).
Does this mean there are two friction angle for this kind of material??
##################################################################################

I know these are some basic knowledge, but I didn't fully understand before. I hope someone can give me some clear thoughts.

best,
Yong



references: [1] https://yade-dem.org/doc/yade.wrapper.html?highlight=cohfrictmat#yade.wrapper.CohFrictMat
[2] https://yade-dem.org/doc/yade.wrapper.html?highlight=cohfrictphys#yade.wrapper.CohFrictPhys
[3] https://yade-dem.org/doc/yade.wrapper.html?highlight=ip2_cohfrictmat_cohfrictmat_cohfrictphys#yade.wrapper.Ip2_CohFrictMat_CohFrictMat_CohFrictPhys

-- 
You received this question notification because your team yade-users is
an answer contact for Yade.