Question #665857 on Yade changed: https://answers.launchpad.net/yade/+question/665857
Status: Answered => Open Seti is still having a problem: Hi Robert, thanks for your reply, no error just below message: init done, will now run. Damaged, stopping. Compressive strength fc=691231 gnuplot 20180330T170719p8266.gnuplot Bye. here is the code: ######## #!/usr/bin/python # -*- coding: utf-8 -*- from __future__ import division from yade import plot,pack,timing import time, sys, os, copy #import matplotlib #matplotlib.rc('text',usetex=True) #matplotlib.rc('text.latex',preamble=r'\usepackage{concrete}\usepackage{euler}') """ A fairly complex script performing uniaxial tension-compression test on hyperboloid-shaped specimen. Most parameters of the model (and of the setup) can be read from table using yade-multi. After the simulation setup, tension loading is run and stresses are periodically saved for plotting as well as checked for getting below the maximum value so far. This indicates failure (see stopIfDamaged function). After failure in tension, the original setup is loaded anew and the sense of loading reversed. After failure in compression, strain-stress curves are saved via plot.saveGnuplot and we exit, giving some useful information like peak stresses in tension/compression. Running this script for the first time can take long time, as the specimen is prepared using triaxial compression. Next time, however, an attempt is made to load previously-generated packing (from /tmp/triaxPackCache.sqlite) and this expensive procedure is avoided. The specimen length can be specified, its diameter is half of the length and skirt of the hyperboloid is 4/5 of the width. The particle size is constant and can be specified using the sphereRadius parameter. The 3d display has displacement scaling applied, so that the fracture looks more spectacular. The scale is 1000 for tension and 100 for compression. """ # default parameters or from table readParamsFromTable(noTableOk=True, # unknownOk=True, young=24e9, poisson=.2, sigmaT=3.5e6, frictionAngle=atan(0.8), epsCrackOnset=1e-4, relDuctility=30, intRadius=1.5, dtSafety=.8, damping=0.4, strainRateTension=.00005, strainRateCompression=.00005, setSpeeds=True, # 1=tension, 2=compression (ANDed; 3=both) doModes=2, specimenLength=.15, sphereRadius=3.5e-3, # isotropic confinement (should be negative) isoPrestress=0, ) from yade.params.table import * from yade.params.table import * if 'sigmaT=3.5e6, compression' in O.tags.keys(): O.tags['id']=O.tags['id']+O.tags['sigmaT=3.5e6, compression'] # make geom; the dimensions are hard-coded here; could be in param table if desired # z-oriented hyperboloid, length 20cm, diameter 10cm, skirt 8cm # using spheres 7mm of diameter ##################### mat1=CpmMat(young=young,frictionAngle=frictionAngle,poisson=poisson,density=4800,sigmaT=sigmaT,relDuctility=relDuctility,epsCrackOnset=epsCrackOnset,isoPrestress=isoPrestress) concreteId1=O.materials.append(mat1) #sp=pack.randomDensePack(pack.inHyperboloid((0,0,-.5*specimenLength),(0,0,.5*specimenLength),.25*specimenLength,.17*specimenLength),spheresInCell=2000,radius=sphereRadius,memoizeDb='/tmp/triaxPackCache.sqlite',returnSpherePack=True) ############################# sp=pack.SpherePack() pred=pack.inCylinder((0,0,0.0002),(0,0,0.3),0.05) O.bodies.append(pack.randomDensePack(pred,radius=0.007)) bb=uniaxialTestFeatures() negIds,posIds,axis,crossSectionArea=bb['negIds'],bb['posIds'],bb['axis'],bb['area'] O.dt=dtSafety*PWaveTimeStep() print 'Timestep',O.dt mm,mx=[pt[axis] for pt in aabbExtrema()] coord_25,coord_50,coord_75=mm+.25*(mx-mm),mm+.5*(mx-mm),mm+.75*(mx-mm) area_25,area_50,area_75=approxSectionArea(coord_25,axis),approxSectionArea(coord_50,axis),approxSectionArea(coord_75,axis) O.engines=[ ForceResetter(), InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=intRadius,label='is2aabb'),],verletDist=.05*sphereRadius), InteractionLoop( [Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=intRadius,label='ss2sc')], [Ip2_CpmMat_CpmMat_CpmPhys()], [Law2_ScGeom_CpmPhys_Cpm()], ), NewtonIntegrator(damping=damping,label='damper'), CpmStateUpdater(realPeriod=.5), UniaxialStrainer(strainRate=strainRateTension,axis=axis,asymmetry=0,posIds=posIds,negIds=negIds,crossSectionArea=crossSectionArea,blockDisplacements=False,blockRotations=False,setSpeeds=setSpeeds,label='strainer'), PyRunner(virtPeriod=1e-6/strainRateTension,realPeriod=1,command='addPlotData()',label='plotDataCollector',initRun=True), PyRunner(realPeriod=4,command='stopIfDamaged()',label='damageChecker'), ] #O.miscParams=[Gl1_CpmPhys(dmgLabel=False,colorStrain=False,epsNLabel=False,epsT=False,epsTAxes=False,normal=False,contactLine=True)] # plot stresses in ¼, ½ and ¾ if desired as well; too crowded in the graph that includes confinement, though plot.plots={'eps':('sigma',)} #,'sigma.50')},'t':('eps')} #'sigma.25','sigma.50','sigma.75')} O.saveTmp('initial'); O.timingEnabled=False global mode mode='tension' if doModes & 1 else 'compression' def initTest(): global mode print "init" if O.iter>0: O.wait(); O.loadTmp('initial') print "Reversing plot data"; plot.reverseData() else: plot.plot(subPlots=False) strainer.strainRate=abs(strainRateTension) if mode=='tension' else -abs(strainRateCompression) try: from yade import qt renderer=qt.Renderer() renderer.dispScale=(1000,1000,1000) if mode=='tension' else (100,100,100) except ImportError: pass print "init done, will now run." O.step(); # to create initial contacts # now reset the interaction radius and go ahead ss2sc.interactionDetectionFactor=1. is2aabb.aabbEnlargeFactor=1. O.run() def stopIfDamaged(): global mode if O.iter<2 or not plot.data.has_key('sigma'): return # do nothing at the very beginning sigma,eps=plot.data['sigma'],plot.data['eps'] extremum=max(sigma) if (strainer.strainRate>0) else min(sigma) minMaxRatio=0.5 if mode=='tension' else 0.5 if extremum==0: return import sys; sys.stdout.flush() if abs(sigma[-1]/extremum)<minMaxRatio or abs(strainer.strain)>(5e-3 if isoPrestress==0 else 5e-2): if mode=='tension' and doModes & 2: # only if compression is enabled mode='compression' O.save('/tmp/uniax-tension.yade.gz') print "Saved /tmp/uniax-tension.yade.gz (for use with interaction-histogram.py and uniax-post.py)" print "Damaged, switching to compression... "; O.pause() # important! initTest must be launched in a separate thread; # otherwise O.load would wait for the iteration to finish, # but it would wait for initTest to return and deadlock would result import thread; thread.start_new_thread(initTest,()) return else: print "Damaged, stopping." ft,fc=max(sigma),min(sigma) if doModes==3: print 'Strengths fc=%g, ft=%g, |fc/ft|=%g'%(fc,ft,abs(fc/ft)) if doModes==2: print 'Compressive strength fc=%g'%(abs(fc)) if doModes==1: print 'Tensile strength ft=%g'%(abs(ft)) title=O.tags['description'] if 'description' in O.tags.keys() else O.tags['params'] print 'gnuplot',plot.saveGnuplot(O.tags['id'],title=title) print 'Bye.' O.pause() #sys.exit(0) # results in some threading exception def addPlotData(): yade.plot.addData({'t':O.time,'i':O.iter,'eps':strainer.strain,'sigma':strainer.avgStress+isoPrestress, 'sigma.25':forcesOnCoordPlane(coord_25,axis)[axis]/area_25+isoPrestress, 'sigma.50':forcesOnCoordPlane(coord_50,axis)[axis]/area_50+isoPrestress, 'sigma.75':forcesOnCoordPlane(coord_75,axis)[axis]/area_75+isoPrestress, }) plot.plot(subPlots=False) #O.run() initTest() waitIfBatch() O.run(5000,True) plot.plots={'eps':('sigma')} plot.plot(subPlots=False) plot.saveDataTxt('sigmaTttt=1.1e4,0.50000, compression') ##### PLAY THE SIMULATION HERE WITH "PLAY" BUTTON OR WITH THE COMMAND O.run(N) ##### rr=yade.qt.Renderer() rr.shape=False rr.intrPhys=True #### Thanks, Seti -- 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