abaqus帮助文档翻译2111一摞积木在通用接触下的倒塌分析

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1、2.1.11CollapseofastackofblockswithgeneralcontactProduct:Abaqus/ExplicitThisexampleillustratestheuseofthegeneralcontactcapabilityinasimulationinvolvingalargenumberofcontactingbodies.Thegeneralcontactalgorithmallowsverysimpledefinitionsofcontactw让hveryfewrestrictionsonthetypesofsurfacesi

2、nvolved(see“DefininggeneralcontactinteractionsinAbaqus/ExplicitJSection35.4」oftheAbaqusAnalysisUser'sManual).ProblemdescriptionThemodelsimulatesthecollapseofastackofblocks.TheundeformedlconfigurationofthemodelisshowninFigure2」.l1-1.Thereare35blocks,andeachblockis12.7x12.7x76.2mm(0.5x0.

3、5x3inches)insize.Theblocksarestackedonarigidfloor.Thestackissubjectedtogravityloading.Itisassumedthatakeyblocknearthebottomofthestackhasbeenremovedjustbeforethestartoftheanalysis,initiatingthecollapse.EachblockismodeledwithasingleC3D8Relement.Theuseofacoarsemeshhighlightstheedge-to-edg

4、econtactcapabilityofthegeneralcontactalgorithm,becausethemajorityoftheblock-to-blockinteractionsdonotresultinpenetrationsofnodesintofaces.Twodifferentcasesareanalyzed.Inthefirstanalysistheblocksarerigid.Inthesecondanalysistheblocksaredeformable.Inthelattercase,thematerialoftheblockisas

5、sumedtobelinearelasticwithaYoung'smodulusof12.135GPa(1.76x106Psi),aPoisson'sratioof0.3,andadensityof577.098kg/m3(5.4x10~5lbs2/in4).Onlythedensityisrelevantfortheanalysisassumingrigidblocks.Inaddition,ENHANCEDhourglasscontrolisusedforthedeformableanalysis.Therigidfloorismodeledasadiscre

6、terigidsurfaceusingasingleR3D4element.Thismodelinvolvesalargenumberofcontactingbodies.Thegeneralcontactcapabilitygreatlysimplifiesthecontactdefinition,sinceeachofthe595possibleblock-to-blockpairingsdoesnotneedtobespecifiedindividually.Thegeneralcontactinclusionsoptiontoautomaticallydef

7、ineanall-inclusivesurfaceisusedandisthesimplestwaytodefinecontactinthemodel.Coulombfrictionwithafrictioncoefficientof0」5isassumedbetweentheindividualblocksandbetweentheblocksandfloor.Thegeneralcontactpropertyassignmentisusedtoassignthisnondefaultcontactproperty.Bydefault,thegeneralco