New question #701028 on Yade: https://answers.launchpad.net/yade/+question/701028
Hi, I'm new in Yade. I wanted to do a triaxial test on a cylindrical specimen. I found a code on github and modified the code for my specimen (the original code creates a spherical pack and do triaxial test but I created a cylindrical sample of desired porosity and imported the coordinates to this code). I ran the code but the cylindrical membrane that was supposed to be created around the spherical pack is created away from the pack. Can somebody help me? Here is the link to the actual code: http://bazaar.launchpad.net/~yade-pkg/yade/git-trunk/view/head:/examples/concrete/triax.py Here is the code: # -*- encoding=utf-8 -*- from __future__ import print_function ################################################################################ # # Triaxial test. Axial strain rate is prescribed and transverse prestress. # Test is possible on prism or cylinder # An independent c++ engine may be created from this script in the future. # ################################################################################ from builtins import range from yade import ymport, plot from yade import pack, plot import os # default parameters or from table readParamsFromTable(noTableOk=True, # material parameters young = 10e7, poisson = .3, frictionAngle = 0.15, sigmaT = 1.5e6, # prestress preStress = -3e6, # axial strain rate strainRate = -100, # assamlby parameters rParticle = 0.0005, width = 5, height = 9.85, bcCoeff = 5, # facets division nw = 48, nh = 30, # output specifications fileName = 'test', exportDir = '/tmp', runGnuplot = False, runInGui = True, ) from yade.params.table import * # materials sphereMat = O.materials.append(CohFrictMat(young=young,poisson=poisson,frictionAngle=frictionAngle,alphaKr=0.25,alphaKtw=0,etaRoll=0.005,etaTwist=0,normalCohesion=5e6,shearCohesion=5e6,momentRotationLaw=True,density=2530)) frictMat = O.materials.append(FrictMat( young=young,poisson=poisson,frictionAngle=frictionAngle )) # spheres sp= ymport.textExt('DensepackRD70-80',format='x_y_z_r',shift= Vector3(0,0,0.5*height), scale=1.0, material=sphereMat) spheres = O.bodies.append(sp) #pred = pack.inCylinder((0,0,0),(0,0,height),.5*width) if testType=='cyl' else pack.inAlignedBox((-.5*width,-.5*width,0),(.5*width,.5*width,height)) if testType=='cube' else None #sp=SpherePack() #sp = pack.randomDensePack(pred,spheresInCell=2000,radius=rParticle,memoizeDb='/tmp/triaxTestOnCylinder.sqlite',returnSpherePack=True) #spheres=sp.toSimulation(color=(0,1,1)) # bottom and top of specimen. Will have prescribed velocity bot = [O.bodies[s] for s in spheres if O.bodies[s].state.pos[2]<rParticle*bcCoeff] top = [O.bodies[s] for s in spheres if O.bodies[s].state.pos[2]>height-rParticle*bcCoeff] vel = strainRate*(height-rParticle*2*bcCoeff) top_limit = 0 top_id = 0 for s in top: if s.state.pos[2]>=top_limit: top_limit = s.state.pos[2] top_id = s.id bot_limit = height bot_id = 0 for s in bot: if s.state.pos[2]<=bot_limit: bot_limit = s.state.pos[2] bot_id = s.id # facets facets = [] rCyl2 = .5*width / cos(pi/float(nw)) for r in range(nw): for h in range(nh): v1 = Vector3( rCyl2*cos(2*pi*(r+0)/float(nw)), rCyl2*sin(2*pi*(r+0)/float(nw)), height*(h+0)/float(nh) ) v2 = Vector3( rCyl2*cos(2*pi*(r+1)/float(nw)), rCyl2*sin(2*pi*(r+1)/float(nw)), height*(h+0)/float(nh) ) v3 = Vector3( rCyl2*cos(2*pi*(r+1)/float(nw)), rCyl2*sin(2*pi*(r+1)/float(nw)), height*(h+1)/float(nh) ) v4 = Vector3( rCyl2*cos(2*pi*(r+0)/float(nw)), rCyl2*sin(2*pi*(r+0)/float(nw)), height*(h+1)/float(nh) ) f1 = facet((v1,v2,v3),color=(0,0,1),material=frictMat) f2 = facet((v1,v3,v4),color=(0,0,1),material=frictMat) facets.extend((f1,f2)) O.bodies.append(facets) mass = O.bodies[0].state.mass for f in facets: f.state.mass = mass f.state.blockedDOFs = 'XYZz' # plots plot.plots = { 'e':('s',), } def plotAddData(): f1 = sum(O.forces.f(b.id)[2] for b in top) f2 = sum(O.forces.f(b.id)[2] for b in bot) f = .5*(f2-f1) s = f/(pi*.25*width*width) e = (top[0].state.displ()[2] - bot[0].state.displ()[2]) / (height-rParticle*2*bcCoeff) plot.addData( i = O.iter, s = s, e = e, ) # apply prestress to facets def addForces(): for f in facets: n = f.shape.normal a = f.shape.area O.forces.addF(f.id,preStress*a*n) # stop condition and exit of the simulation def stopIfDamaged(maxEps=5e-3): extremum = max(abs(s) for s in plot.data['s']) s = abs(plot.data['s'][-1]) e = abs(plot.data['e'][-1]) if O.iter < 1000 or s > .5*extremum and e < maxEps: return f = os.path.join(exportDir,fileName) print('gnuplot',plot.saveGnuplot(f,term='png')) if runGnuplot: import subprocess os.chdir(exportDir) subprocess.Popen(['gnuplot',f+'.gnuplot']).wait() print('Simulation finished') O.pause() #sys.exit(0) # results in some threading exception O.dt=.5*utils.PWaveTimeStep() enlargeFactor=1.5 O.engines=[ ForceResetter(), InsertionSortCollider([ Bo1_Sphere_Aabb(aabbEnlargeFactor=enlargeFactor,label='bo1s'), Bo1_Facet_Aabb() ]), InteractionLoop( [ Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=enlargeFactor,label='ss2d3dg'), Ig2_Facet_Sphere_ScGeom(), ], [ Ip2_CpmMat_CpmMat_CpmPhys(cohesiveThresholdIter=O.iter+5), Ip2_FrictMat_CpmMat_FrictPhys(), Ip2_FrictMat_FrictMat_FrictPhys(), ], [ Law2_ScGeom_CpmPhys_Cpm(), Law2_ScGeom_FrictPhys_CundallStrack(), ], ), PyRunner(iterPeriod=1,command="addForces()"), NewtonIntegrator(damping=.3), CpmStateUpdater(iterPeriod=50,label='cpmStateUpdater'), PyRunner(command='plotAddData()',iterPeriod=100), PyRunner(iterPeriod=50,command='stopIfDamaged()'), ] # run one step O.step() # reset interaction detection enlargement bo1s.aabbEnlargeFactor=ss2d3dg.interactionDetectionFactor=1.0 # initialize auto-updated plot if runInGui: plot.plot() try: from yade import qt renderer=qt.Renderer() # uncomment following line to exagerate displacement #renderer.dispScale=(100,100,100) except: pass # run O.run() -- 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
