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1、Terfenol-Delasto-magneticpropertiesundervariedoperatingconditionsusinghysteresisloopanalysisLeAnnE.Faidley*,BrianJ.Lund†,AlisonB.Flatau‡,FrederickT.Calkins§AEEMDepartment,IowaStateUniversity,Ames,IA50011ABSTRACTThispaperpresentsanexperimentalstudyoftheeffectsofvarie
2、dmagneticbias,ACmagneticfieldamplitudeandfrequencyonthecharacteristicsofhysteresisloopsproducedinamagnetostrictivetransducer.ThestudyusesamagnetostrictivetransducerdesignedatIowaStateUniversitythatutilizesan11.5cm(4.54in)longby1.27cm(0.5in.)diametercylindricalTerfen
3、ol-Drod.Thistransducerallowscontrolledvariationofthefollowingoperatingconditions:mechanicalprestress,magnitudeandfrequencyofACmagneticfield,andmagneticbias.Byperformingextensiveexperimentaltests,materialpropertytrendscanbedevelopedforuseintheoptimizationoftransducer
4、designparametersfordifferentapplications.Fortheresultspresented,themagneticbias,theACmagneticfieldamplitude,andthefrequencyofexcitationwereindependentlyvariedwhiletemperature,massloadandprestresswerekeptconstant.Theminorhysteresisloopsofthestrainversusappliedmagneti
5、cfield,fluxdensityversusappliedmagneticfield,andmagnetizationversusappliedmagneticfieldarepresentedandcompared.Materialpropertytrendsidentifiedfromtheminorloopsarepresentedfortheaxialstraincoefficient,permeability,susceptibility,andenergylosses.Keywords:Terfenol-D,m
6、agnetostrictivetransducers,hysteresisloops1.INTRODUCTIONANDBACKGROUNDTerfenol-D(Tb0.3Dy0.7Fe1.9)isahighlymagnetostrictivematerialdevelopedinthe1950’sattheNavalOrdinanceLabs(nowcalledNSWC).ItisanalloyofTerbium,Iron,andDysprosiumthatcanachievestrainsontheorderof1000x1
7、0^-6m/mwhenexposedtoamagneticfieldundercertainconditions.Thismaterialistheactiveelementinmanymagnetostrictivetransducersthatarebeingdeveloped,tested,andmanufacturedatthepresent.Oneoftheobstaclesthatwasfoundinthedesignofthesemagnetostrictivetransducersisthatthebehavi
8、oroftheTerfenol-Drodishighlydependentontheexternalconditionsunderwhichthetransduceroperatesaswellasonthetransducerdesignitself.Workdetaile
