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[mohsen <question290372@xxxxxxxxxxxxxxxxxxxxx>]

New question #290372 on Yade:
https://answers.launchpad.net/yade/+question/290372

In the name of god
hello all
during an script i make contact between two spheres of Cpm material but the different parameters. There are two bouncing spheres.  Then i checked O.interactions two see the contact parameters. I do not know how the young modulus of contact has been computed?
 any idea?

Thanks every one
#####
mat2=CpmMat(young=1e6,neverDamage=True,density=2500,poisson=0.2,epsCrackOnset=1e20,relDuctility=10,frictionAngle=0.5,label='mat2')  
O.materials.append(mat2)
O.materials.append(CpmMat(young=1e12,neverDamage=True,poisson=0.3,frictionAngle=radians(30),sigmaT=4e100,epsCrackOnset=1e20,density=2600,relDuctility=10,label='mat1')) 

O.bodies.append([

sphere(center=(0,0,0),radius=.5,fixed=True, material='mat1'),

sphere((0,0,2),.5, material='mat2')
])

intRadius = 1
O.engines = [
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=intRadius,label='is2aabb'),Bo1_Facet_Aabb(),Bo1_Wall_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=intRadius,label='ss2d3dg'),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom()],
[Ip2_CpmMat_CpmMat_CpmPhys()],
[Law2_ScGeom_CpmPhys_Cpm()]
),
NewtonIntegrator(gravity=(0,0,-10),damping=0.2),
]
O.dt = .2*PWaveTimeStep()
#########

The interaction specifications:

{'E': 500000500000.0,
 'G': 175000175000.0,
 'crossSection': 0.7853981633974483,
 'damLaw': 1,
 'dmgOverstress': 0.0,
 'dmgRateExp': 0.0,
 'dmgStrain': 0.0,
 'dmgTau': -1.0,
 'epsCrackOnset': 1e+20,
 'epsFracture': 1e+21,
 'isCohesive': False,
 'isoPrestress': 0.0,
 'kn': 392699474749.80115,
 'ks': 137444816162.43042,
 'neverDamage': True,
 'normalForce': Vector3(0,0,-7853.981599551652),
 'plRateExp': 0.0,
 'plTau': -1.0,
 'refLength': 0.9999999991036522,
 'refPD': 8.963477737822245e-10,
 'relDuctility': 10.0,
 'shearForce': Vector3(-0,-0,-7.623695394542987e-13),
 'tanFrictionAngle': 0.9538822108108043,
 'undamagedCohesion': 2e+100}


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