单轴压应力对压电叠层驱动器铁电行为的影响

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1、http://www.paper.edu.cnInfluenceofuniaxialcompressivestressontheferroelectricbehaviorsofpiezoelectricstackactuatorsYangGang，GouHuanlin，JiYe，YueZhenxing*，LiLongtuStateKeyLaboratoryofNewCeramicsandFineProcessing，DepartmentofMaterialsScienceandEngineering，TsinghuaUniversity，Be

2、ijing（100084）E-mail：yuezhx@mail.tsinghua.edu.cnAbstractTheinfluencesoftheuniaxialcompressivestressonthedynamichysteresisofthePZTpiezoelectricstackactuatorwereinvestigatedthroughtheLandau-Khalatnikovsimulationandexperiments.Theresultsshowedthatthehysteresisarea(A),remnantpol

3、arization(Pr)andcoercivefield(Ec)decreasedwithincreasingtheexternalcompressivestress,whichcouldbeointerpretedintermsofiondisplacement,domainswitchingandmovementof90domainwallundertheundercombinedelectricfieldanduniaxialcompressivestress.Furthermore,asforthechangetrendsofthe

4、hysteresisloops(E-Ploops)withincreasingstress,thesimulatedresultsarefoundtobeingoodagreementwiththemeasuredresults.Keywords:Piezoelectricstackactuator;Stress;Hysteresis;Landau-Khalatnikovtheory1IntroductionLeadzirconate-leadtitanate(PZT)solidsolutionwithcompositionsnearthem

5、orphotropicphaseboundary(MPB)isanimportantceramicwhichhasbeenextensivelyusedinactuatorapplications,includingprecisionpositioning,vibrationsuppression,noisecontrol,nonvolatilememories,inkjetprinters,andactuatordevices[1].Themultilayerceramicactuatorisadevicewhichconvertsthee

6、lectricenergyintothemechanicalenergythroughthereversepiezoelectriceffects.However,becausetheactuatorsareofteninoperationunderthecombinedstressandelectricfield,PZTceramicsmustbesubjectedtoacertainmechanicalloadswhichcanalterthedielectricandpiezoelectricpropertiesoftheactuato

7、r.Asaresult,tounderstandhowthematerialpropertieschangeunderdifferentloadconditionsiscrucialfortheproperdesignofadeviceandforthesuitableselectionofmaterialsforspecificapplication[2-4].Thedielectricandpiezoelectricresponsesofthepiezoelectricceramicswithrespecttodomainwallmoti

8、onhavebeenintensivelyinvestigatedunderthecombinedelectro-mechanicalloads[1-6].ooGe