New question #678440 on Yade: https://answers.launchpad.net/yade/+question/678440
Hi, That's my other question. (https://answers.launchpad.net/yade/+question/678348) Let me give another example.Copying script from (https://yade-dev.gitlab.io/trunk/tutorial-examples.html) Using my own custom materials. materials.append(FrictMat(young=64e9,poisson=0.12,density=2650,frictionAngle=0.23) In the second compression, change triax.maxStrainRate=(0,0,0).If I adjust young's modulus to young=64e7, it can maintain the stress of the first isotropic compression, otherwise the stress becomes 0. I wonder why young's modulus can cause such a big change? How can I adjust:) Thanks ##################### # encoding: utf-8 sigmaIso=-1e5 #import matplotlib #matplotlib.use('Agg') # generate loose packing from yade import pack, qt, plot O.periodic=True sphere=O.materials.append(FrictMat(young=64e9,poisson=0.12,density=2650,frictionAngle=0.23,label='sphere')) sp=pack.SpherePack() sp.makeCloud((0,0,0),(2,2,2),rMean=.1,rRelFuzz=.3,periodic=True) sp.toSimulation() O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb()]), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom()], [Ip2_FrictMat_FrictMat_FrictPhys()], [Law2_ScGeom_FrictPhys_CundallStrack()] ), PeriTriaxController(label='triax', # specify target values and whether they are strains or stresses goal=(sigmaIso,sigmaIso,sigmaIso),stressMask=7, # type of servo-control dynCell=True,maxStrainRate=(10,10,10), # wait until the unbalanced force goes below this value maxUnbalanced=.1,relStressTol=1e-3, # call this function when goal is reached and the packing is stable doneHook='compactionFinished()' ), NewtonIntegrator(damping=.2), PyRunner(command='addPlotData()',iterPeriod=100), ] O.dt=.5*PWaveTimeStep() def addPlotData(): plot.addData(unbalanced=unbalancedForce(),i=O.iter, sxx=triax.stress[0],syy=triax.stress[1],szz=triax.stress[2], exx=triax.strain[0],eyy=triax.strain[1],ezz=triax.strain[2], # save all available energy data Etot=O.energy.total(),**O.energy ) # enable energy tracking in the code O.trackEnergy=True # define what to plot plot.plots={'i':('unbalanced',),'i ':('sxx','syy','szz'),' i':('exx','eyy','ezz'), # energy plot ' i ':(O.energy.keys,None,'Etot'), } # show the plot plot.plot() def compactionFinished(): # set the current cell configuration to be the reference one O.cell.trsf=Matrix3.Identity # change control type: keep constant confinement in x,y, 20% compression in z triax.goal=(sigmaIso,sigmaIso,-.2) triax.stressMask=3 # allow faster deformation along x,y to better maintain stresses triax.maxStrainRate=(0,0,0) # next time, call triaxFinished instead of compactionFinished triax.doneHook='triaxFinished()' # do not wait for stabilization before calling triaxFinished triax.maxUnbalanced=10 def triaxFinished(): print 'Finished' O.pause() -- You received this question notification because your team yade-users 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
