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1、不同边界条件下颗粒材料变形机制的离散元细观分析//.paper.edu.cn-1-中国科技论文在线Micro-deformationmechanismofgranularmaterialsunderdifferentboundaryconditionsbasedonDEMsimulation#TONGZhaoxia,ZHOUMin,YAOYangping*8><#004699'>5(SchoolofTransportationScienceandEngineering,BeihangUniversity)Foundations:Res
2、earchFundfortheDoctoralProgramofHigherEducationofChina(20091102120018)；NationalNaturalScienceFoundationofChina(1090200<#004699'>5)Briefauthorintroduction:TongZhaoxia(1976-)，Female，AssistantProfessor,Constitutivetheoryforgranularmaterilas,Soildynamicsandearthquakeenginee
3、ring.EAbstract:SeriesofbiaxialcompressionsimulationsarecarriedouttoinvestigatetheeffectsofboundaryconditiononthedeformationofgranularmaterialsbyusingDEM.TheparametersusedinDEMarevalidatedbythebiaxialcompressionexperimentsonellipticalsteelbars.Theeffectsofboundaryconditi
4、ononthestress-strainrelationshipareanalyzed.Andspecialfocusareputinthe10analysisofparticledisplacement,particlerotation,voiddistribution,particlelongaxisorientationandcontactforcewiththedevelopmentofdeformation.Keywords:Boundarycondition;Micromechanics;Discreteelementme
5、thod(DEM);Granularmaterial;1<#004699'>50IntroductionDEM(Discreteelementmethod)hasbeenprovedtobeanefficientmethodtostudythemicro-deformationmechanismofgranularmaterialssinceitwasputforwardbyCundallandStrack1979[1],duetoitsspecialadvantageofcapturingthespaceandcontactinfo
6、rmationofparticlesatanyloadingtime.ByusingDEMtosimulatetheactuallaboratoryexperiments,a20certainboundarymustbeapplied.Tillnow,variousboundariesnamedrigidboundary,flexibleboundary,periodicboundary,circumferentialperiodicboundaryandhydrostaticboundaryhasbeenused[2-3].Howe
7、ver,itshouldbenotedthatmostofDEMsimulationexistalargegapwhencomparingwiththeactuallaboratoryexperiments,forexample,granularmaterialswithirregularshapesintheactuallaboratoryexperimentsareusuallysimulatedtobecircularofelliptical2<#004699'>5particles.Inthispaper,biaxialcom
8、pressionexperimentsonidealellipticalsteelbarsweresimulatedbyDEMwithactualboundaryconditions.Theparametersusedi
