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1、Terfenol-Delasto-magneticpropertiesundervariedoperatingconditionsusinghysteresisloopanalysisLeAnnE.Faidley*,BrianJ.Lund†,AlisonB.Flatau‡,FrederickT.Calkins§AEEMDepartment,IowaStateUniversity,Ames,IA50011ABSTRACTThispaperpresentsanexperimentalstudyoftheeffectsofvariedmagn
2、eticbias,ACmagneticfieldamplitudeandfrequencyonthecharacteristicsofhysteresisloopsproducedinamagnetostrictivetransducer.ThestudyusesamagnetostrictivetransducerdesignedatIowaStateUniversitythatutilizesan11.5cm(4.54in)longby1.27cm(0.5in.)diametercylindricalTerfenol-Drod.Th
3、istransducerallowscontrolledvariationofthefollowingoperatingconditions:mechanicalprestress,magnitudeandfrequencyofACmagneticfield,andmagneticbias.Byperformingextensiveexperimentaltests,materialpropertytrendscanbedevelopedforuseintheoptimizationoftransducerdesignparameter
4、sfordifferentapplications.Fortheresultspresented,themagneticbias,theACmagneticfieldamplitude,andthefrequencyofexcitationwereindependentlyvariedwhiletemperature,massloadandprestresswerekeptconstant.Theminorhysteresisloopsofthestrainversusappliedmagneticfield,fluxdensityve
5、rsusappliedmagneticfield,andmagnetizationversusappliedmagneticfieldarepresentedandcompared.Materialpropertytrendsidentifiedfromtheminorloopsarepresentedfortheaxialstraincoefficient,permeability,susceptibility,andenergylosses.Keywords:Terfenol-D,magnetostrictivetransducer
6、s,hysteresisloops1.INTRODUCTIONANDBACKGROUNDTerfenol-D(Tb0.3Dy0.7Fe1.9)isahighlymagnetostrictivematerialdevelopedinthe1950’sattheNavalOrdinanceLabs(nowcalledNSWC).ItisanalloyofTerbium,Iron,andDysprosiumthatcanachievestrainsontheorderof1000x10^-6m/mwhenexposedtoamagneticf
7、ieldundercertainconditions.Thismaterialistheactiveelementinmanymagnetostrictivetransducersthatarebeingdeveloped,tested,andmanufacturedatthepresent.OneoftheobstaclesthatwasfoundinthedesignofthesemagnetostrictivetransducersisthatthebehavioroftheTerfenol-Drodishighlydepende
8、ntontheexternalconditionsunderwhichthetransduceroperatesaswellasonthetransducerdesignitself.Workdetaile
