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基于激光热激励红外热成像纤维增强聚合物复合材料加固混凝土结构界面损伤无损检测.docx

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基于激光热激励红外热成像纤维增强聚合物复合材料加固混凝土结构界面损伤无损检测 Abstract Withthedevelopmentofinfrastructure,concretestructureshavebecomeincreasinglyvulnerabletostructuralinterfacedamage.Inthispaper,weproposeanon-destructivetestingmethodforreinforcedpolymercompositematerialsinconcretestructureinterfacedamagebasedonlaserthermalstimulationinfraredthermalimagingfiber-enhancedpolymercompositematerials. Inthisstudy,weinvestigatetheuseoflaserthermalstimulationtogeneratealocalizedthermalstimulusthatinducesthermalexpansionandsurfacedeformationonthematerialsurface.Theinfraredthermalimagingsystemisusedtocapturethetransientthermalresponseofthematerialsurface,andfiber-reinforcedpolymercompositematerialsareusedforstrengthening. Inordertoverifytheeffectivenessofthemethod,aseriesofexperimentswereconductedonreinforcedpolymercompositematerialsbondedtoconcretesubstrates.Theresultsshowedthatthemethodcouldaccuratelylocateanddeterminetheextentofdamageinareinforcedconcretestructure'sinterface,andtheuseoffiber-reinforcedpolymercompositematerialsresultedinsignificantimprovementsinstrengthanddurability. Overall,thenon-destructivetestingmethodbasedonlaserthermalstimulationinfraredthermalimagingfiber-enhancedpolymercompositematerialspresentedinthispaperprovidesaneffectivesolutionforassessingandremedyingdamageinreinforcedconcretestructures. Keywords:LaserThermalStimulation,InfraredThermalImaging,Fiber-reinforcedPolymerCompositeMaterials,StructuralInterfaceDamage,Non-destructiveTesting Introduction Reinforcedconcretestructuresarewidelyusedininfrastructureconstructionengineeringduetotheirhighstrengthanddurability.However,duetoenvironmentalandmechanicalfactors,concretestructuresaresubjecttodamage,especiallyatthestructuralinterface.Oncedamageoccurs,itcanquicklyspread,leadingtopartialorcompletelossofstructuralintegrityand,inseverecases,collapseorfailure. Non-destructivetesting(NDT)technologyprovidesaneffectivesolutionfordetectingandassessingtheextentofconcretestructuredamagewithoutcausingfurtherdamage.Currently,severalmetho