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1、InternationalJournalofFracture126:287306,2004.?2004KluwerAcademicPublishers.PrintedintheNetherlands.Studyofelasticwavepropagationinducedbypiezoelectricactuatorsforcrackidenti?cationX.D.WANG?andG.L.HUANGDepartmentofMechanicalEngineering,UniversityofAlberta,Edmonton,Alberta,Canada
2、T6G2G8?Correspondingauthor(e-mail:xiaodong.wang@ualberta.ca)Received2September2003;acceptedinrevisedform12February2004Abstract.Thecurrentpaperprovidesatheoreticalstudyofelasticwavepropagationinacrackedelasticmediuminducedbyanembeddedpiezoelectricactuator.Theformulationoftheprobl
3、emisbasedonanewlydevelopedactuatormodelandthesolutionofcoupledcrackandactuatorproblems.Theinteractionbetweenanactuatorandacrackisstudiedtodevelopbasicunderstandingoftheeffectofthecrackuponthewave?eldgenerated.Theresultingwave?eldisusedtosimulatesensorsignals.Scatteredwavefromthe
4、crackisthenregeneratedbysolvingareverseelastodynamicproblemandusedinanimagingtechniquetoidentifythecrack.Keywords:actuators,cracks,imagingtechnique,interaction,piezoelectric,wavepropagation.1.IntroductionPiezoceramicmaterialswhicharecapableofgeneratinglargerstrainsunderelectric?
5、eldshaverevivedtheintensedevelopmentofnewpiezoceramicactuators/sensorsfordifferentengineeringapplications,e.g.spacestructures,aircraftstructures,satellites,andotherelec-tromechanicalsystems(Hagoodetal.,1990;TzouandYe,1994;MitchellandReddy,1995;Boller,2000).Piezoceramicactuatorsa
6、reoflowcostandcanbeeasilyfabricatedintodifferentdesiredsizesandshapes.Correspondingly,theconceptofusinganetworkofactuatorsandsensorstoformselfmonitoringsmartsystemsinadvancedstructuraldesignhasattractedsigni?cantattentionfromtheindustrialandresearchcommunities(Mal,2001;Kessleran
7、dSpearing,2002).Indeed,thistypeofactuators/sensorshavebeenusedindamagedetectioninvariousstructures(Wuetal.,1993;KeilersandChang,1995a,b;Charlesetal.,1995;Okaforetal.,1996;Dattaetal.,1996;Rogers,1999;Schulzetal.,1999;Giurgiutiu,2001;Fukunagaetal.,2002).Differentfromthetraditional
8、non-destructiveevaluationtechniques,wheretheult
