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1、AREVIEWOFMAGNETORHEOLOGICALELASTOMERS:PROPERTIESANDAPPLICATIONSC.Ruddy,E.AhearneandG.ByrneAdvancedManufacturingScience(AMS)ResearchCentre,MechanicalEngineering,UniversityCollegeDublin,Belfield,Dublin4,Ireland.ABSTRACTSmartmaterialsarematerialswithpropertiesthat
2、canbesignificantlyalteredinacontrolledfashionbyexternalstimuli,suchasstress,temperature,pH,moisture,electricormagneticfields.AnelastomercomprisingamatrixinterspersedwithmicronsizedferromagneticparticlesisknownasaMagnetorheologicalElastomer(MRE).Therheologicalpr
3、opertiesofMREs(thedeformationandflowbehaviourunderstress)arealteredbytheapplicationofanexternalmagneticfield.Thecharacteristicresponsewillbeinfluencedbymanyfactorsincluding;theelastomermatrix,thesize,distribution,compositionandpercentagevolumeoftheferromagnetic
4、particles,andwhethertheferromagneticparticlesarealignedinchainsorrandomlydispersed.Areviewispresentedinthispaperoftherheologicalpropertiesofmagnetorheologicalelastomersandhowthesepropertiesareaffectedbyvaryingmagneticfieldsandtheindicatedcompositionalparameters
5、.AswellasdescribingthefundamentalbehaviourofMREs,variousapplicationsofMREsareanalysedandcompared.KEYWORDS:SmartMaterial,MagnetorheologicalElastomer1.INTRODUCTIONTOSMARTMATERIALSMagnetorheologicalElastomers(MREs)belongtoaclassofmaterialsknownasSmartMaterials.Sma
6、rtmaterialsareclassifiedasmaterialsthathavetheabilitytochangeoneormoreoftheirmaterialpropertiesundertheinfluenceofanexternalstimulant.Materialpropertiescanbecontrolledbymanyexternalfactors,includingapplicationofstress,pHlevel,moisturecontent,electricfieldsorint
7、hecaseofMREs,magneticfields.Commonexamplesofsmartmaterialsarememoryshapealloysandpiezoelectricmaterials.Magnetorheologicalmaterials,similarinprincipletoelectrorheologicalmaterials,havetheirviscoelasticandrheologicalpropertiesalteredinthepresenceofamagneticfield
8、.Theyexhibitafastresponsetoexternalstimuli,oftheorderofmilliseconds[1].Figure1:Magnetorheologicalfluidattractedbyanelectro-magneticfield[azonano.com]Magnetorheologicalmateri
