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[Chu <question680868@xxxxxxxxxxxxxxxxxxxxx>]

Question #680868 on Yade changed:
https://answers.launchpad.net/yade/+question/680868

Chu gave more information on the question:
Here is the MWE
#########################
from yade import pack

num_spheres=5# number of spheres
young=2e8
compFricDegree = 30 # initial contact friction during the confining phase
finalFricDegree = 30 # contact friction during the deviatoric loading
mn,mx=Vector3(0,0,0),Vector3(5,5,5) # corners of the initial packing

O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=radians(compFricDegree),density=2600,label='spheres'))
O.materials.append(FrictMat(young=young,poisson=0.5,frictionAngle=0,density=0,label='walls'))
walls=aabbWalls([mn,mx],thickness=0,material='walls')
wallIds=O.bodies.append(walls)

sp=pack.SpherePack()
sp.makeCloud(mn,mx,-1,0.3333,distributeMass=True,num=num_spheres,seed=1) #"seed" make the "random" generation always the same
sp.toSimulation(material='spheres')

triax=TriaxialStressController(
	maxMultiplier=1.+2e4/young, # spheres growing factor (fast growth)
	finalMaxMultiplier=1.+2e3/young, # spheres growing factor (slow growth)
	thickness = 0,
	stressMask = 7,
	max_vel = 0.005,
	internalCompaction=True, # If true the confining pressure is generated by growing particles
)

newton=NewtonIntegrator(damping=0.2,gravity=(0,0,0))

O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
	InteractionLoop(
		[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
		[Ip2_FrictMat_FrictMat_FrictPhys()],
		[Law2_ScGeom_FrictPhys_CundallStrack()],label="iloop"
	),
	#FlowEngine(dead=1,label="flow"),#introduced as a dead engine for the moment, see 2nd section
	GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
	triax,
	newton
]

triax.goal1=triax.goal2=triax.goal3=-10000

while 1:
  O.run(1000, True)
  unb=unbalancedForce()
  if unb<0.001 and abs(-10000-triax.meanStress)/10000<0.001:
    break
  
O.pause()

O.engines=O.engines+[PyRunner(iterPeriod=10,command='test()')]

from collections import Counter

def test():
    for i in O.interactions:
        print 'id=',i.id1,i.id2,'force=',i.phys.normalForce
    for i in O.bodies:
        if isinstance(i.shape,Sphere):
            print 'id=',i.id,'rforce=',O.forces.f(i.id)
            
    O.pause()
            
And I upload a snapshot,maybe it is useful.
https://i.bmp.ovh/imgs/2019/05/96e97af1aca482fc.png

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