2007-Ageneral finite element analysis method for balloon expandable stents based.pdf

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1、FiniteElementsinAnalysisandDesign43(2007)649–658www.elsevier.com/locate/finelAgeneralfiniteelementanalysismethodforballoonexpandablestentsbasedonrepeatedunitcell(RUC)modelZihuiXiaa,∗,FengJua,KatsuhikoSasakibaDepartmentofMechanicalEngineering,UniversityofAlberta,Edmonton

2、,Alta.,CanadaT6G2G8bDivisionofMechanicalScience,HokkaidoUniversity,N13,W8,Kita-ku,Sapporo060-8628,JapanReceived9May2006;receivedinrevisedform12January2007;accepted12January2007Availableonline28February2007AbstractAsuccessfuldeploymentofthestentisdependentonthegoodunde

3、rstandingofitsmechanicalproperties.ThispaperpresentsageneralRUC(repeatedunitcell)approachfortheanalysisofballoonexpandablestentswithvarioustypesofclosedcells.TheapplicationoftheunifiedperiodicboundaryconditionsontheRUCmodelofthestentisformulated.Numericalanalysisisperf

4、ormedbytheABAQUSFEMpackage.StentsofthePalmaz-SchatztypeandNIRtypewithV-orS-shapedlinksareanalyzedwiththeRUCmodelsandthenumericalresultsagreewellwiththoseobtainedbymuchlargermodelsinavailablepublications.Theglobaldeformationpatternandthestressdistributionoftheentirest

5、entcanalsobeobtainedbyageometricaltessellationorassemblingofthedeformedRUCs.Itisfoundfromthenumericalanalysisthatthediameterofthestentduringdeploymentchangesslowlyatthestartandincreasesdrasticallywhentheinternalpressurereachesacriticalvaluewhereyieldinghingesareformed

6、.V-andS-stentsaremucheasiertoexpandthanthePalmaz-Schatzstent.However,theforeshorteningsoftheV-stentandS-stentarenoticeable.TheadvantagesoftheRUCapproacharethattheexistingperiodicitiesinthestentstructurearebetteranddirectlyrepresentedbyapplyingtheperiodicboundarycondit

7、ionsandamuchsmallerFEMmodelandlesscomputationaleffortsarerequiredtoachievethesameanalysisaccuracyasthatbylargermodelsadoptedinpreviouspublications.2007ElsevierB.V.Allrightsreserved.Keywords:Stent;Repeatedunitcellmodel;Finiteelementmethod;Unifiedperiodicboundaryconditi

8、ons;Rotationalsymmetry;Nonlinearanalysis1.Introductiondeploymentofstentsinvolveslargeplasticdeformationandnonlinearcontacts.