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1、Availableonlineatwww.sciencedirect.comComputationalMaterialsScience43(2008)16–26www.elsevier.com/locate/commatsciAconstitutivemodelofmetal–ceramicfunctionallygradedmaterialbehavior:FormulationandparameteridentificationM.Bocciarelli*,G.Bolzon,G.MaierDepartm
2、entofStructuralEngineering,PolitecnicodiMilano,PiazzaL.daVinci32,20133Milan,ItalyAvailableonline19September2007DedicatedtothememoryofProfessorDusanKrajcinovic.AbstractThemechanicalperformancesofindustrialcomponentssuchaswearcoatingsandthermalbarrierscanbe
3、greatlyenhancedbyemployingad-hocdesignedmetal–ceramicfunctionallygradedmaterials(FGMs).ThecontinuouslyvaryingmechanicalpropertiesofFGMscanberelatedtothespatialdistributionoftheircomponentsbyamodifiedruleofmixture,namedTTOmodel,extendedtoJ2flowtheorywithisot
4、ropichardeninginordertodescribetheelastic–plasticbehaviorofmetal–ceramicFGMs.Analternativeelas-tic–plasticmodelisconsideredhere,accountingforavolume-fraction-governedtransitionfromHencky–Huber–Mises(J2flow)model,typicalofthepurelymetallicphase,towardaDruck
5、er–Pragerconstitutivelawmoresuitabletodescribethemechanicalbehaviorofceramics.Potentialitiesandlimitationsofarecentlyproposedinverseanalysisprocedure,basedonindentationtests,fortheidentifica-tionofconstitutiveparametersinvolvedinthismaterialmodelareinvesti
6、gated.Ó2007ElsevierB.V.Allrightsreserved.Keywords:Gradedmaterials;Parameteridentification;Indentation;Imprintmapping1.IntroductionFGMsofdifferentcompositionbyapropercalibrationofacharacteristic‘stresstransfer’parameter,seee.g.,[4,5].Surfaceengineeringisanem
7、ergingdisciplineintechnol-Inthematerialmodeltobeconsideredherein,theTTOogiesleadingtoproductssuchaselectronicpackages,mag-homogenizationrulegovernsthetransitionfromHencky–neticrecordingdevices,opticalinstrumentsandcoatingsHuber–Mises(HHM)model,typicalofme
8、tals,towardafortribologicalprotectionofmechanicalcomponentsandDrucker–Pragerconstitutivemodelwhichismoresuitabletools.Theperformanceoftheseproductscanbeenhancedtodescribethemechanicalresponseofceramics.byappropriate
