基于电阻抗谱结构健康监测

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1、Chapter1ElectricalImpedanceSpectroscopyforStructuralHealthMonitoringGeoffreyA.Slipher,RobertA.Haynes,andJaretC.RiddickAbstractStructuralheathmonitoring(SHM)canprovideanestimateofthestateofdamageinastructure,andoftheremainingusefullifeofthatstructure.Theworkpresentedhereisaninvestigationofaproposedn

2、ewSHMtechniqueforcompositestructurescomposedofcarbon-fiber-reinforced-polymers(CFRP).Electricalimpedancespectroscopy(EIS)isemployedtoestimatethedamagestateofthecomposite.NomodificationtocurrentCFRPprocessingmethodsisrequired,noristheproposedtechniqueinvasiveordestructive.EISinterfacescanbeeitherperma

3、nentlyattachedortemporarilyconnected.WehypothesizethatEIShasthepotentialtobemoresensitiveandselectivefordamagedetectionbyusingafullcomplex-planeanalysis,consideringbothimpedancemagnitudeandphaseangle.ThisisincontrasttoelectricalSHMapproachesemployingresistancemeasurement,therealcomponentofimpedance

4、,whichignoresphaseangleandreactanceinformation.InordertotestourhypothesisweimplementedthreedifferentexperimentstoevaluatetheeffectivenessoftheEIStechnique:(1)specimenloadsensitivity;(2)specimendamagesensitivity;and(3)specimenfatiguesensitivity.Multipleelectricalinterrogationpathsthroughthespecimena

5、reconsidered.KeywordsElectricalimpedancespectroscopy•Structuralhealthmonitoring•Carbonfiber•Fatiguestate•Damagestatedetection•Loadstatedetection1.1IntroductionCarbon-fiberreinforcedcompositematerialsarerapidlygainingwideuseforavarietyofapplicationspertainingtoaircraft,spacecraftandcivilinfrastructure

6、.Therecenttrendtowardcondition-basedmaintenanceofadvancedstructuralplatformshasgivenrisetosensor-basedmonitoringofcriticalstructuralcomponents.Structuralhealthmonitoringreferstotheuseofsensordataasameanstoprovideanestimateofthestateofdamageinastructure,andoftheremainingusefullifeofthatstructure.Per

7、vasiveuseofSHMincompositestructuresinthefuturewillenablenewstructuralapplicationsthatexploitthepresenceofsensorstoenablenovellightweightdesignsandreducedmaintenanceburdens.Damagedetectionbystructuralself-se