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大直径SHPB实验中的高温加载技术及其应用.docx

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大直径SHPB实验中的高温加载技术及其应用 Title:High-TemperatureLoadingTechniquesandApplicationsinLargeDiameterSHPBExperiments Introduction: TheSplit-HopkinsonPressureBar(SHPB)techniqueisawidelyusedexperimentalmethodforinvestigatingthedynamicmechanicalpropertiesofmaterialsunderhigh-strainrateloadingconditions.Thehigh-temperatureSHPBtechniqueextendstheapplicationofthisexperimentalmethodtostudymaterialbehaviorunderelevatedtemperatures.Thispaperaimstoexplorethedifferenthigh-temperatureloadingtechniquesemployedinlargediameterSHPBexperimentsandtheirapplications. 1.High-TemperatureSHPBSetup: Theprimarycomponentsofahigh-temperatureSHPBsetupincludeagasgunsystem,strikerbar,incidentandtransmissionbars,specimenholder,andtemperaturecontrolsystem.Thegasgunsystemgeneratesacompressivestresswavethatisimpartedonthestrikerbar.Theincidentandtransmissionbarstransmitthestresswavetothespecimen,whichisheldinplacebyaspecimenholder.Thetemperaturecontrolsystemensuresthatthespecimenissubjectedtothedesiredtemperatureduringtesting. 2.HeatingTechniques: Severalhigh-temperatureheatingtechniquesareemployedinlargediameterSHPBexperiments,includingresistiveheating,laserheating,inductionheating,andradiantheating. 2.1ResistiveHeating: Resistiveheatinginvolvespassinganelectriccurrentthroughthespecimentogenerateheat.Anexternallyappliedelectriccurrentispassedthroughthespecimen,whichactsasaresistor.Theresistanceconvertselectricalenergyintoheatenergy,resultingintemperatureincrease.Thistechniqueenablesprecisecontroloftheheatingrateandtemperature. 2.2LaserHeating: Laserheatingemploysahigh-intensitylaserbeamtoheatthespecimen.Thelaserbeamisfocusedonthespecimensurface,causinglocalizedheating.Laserheatingoffersquickheatingratesandprecisetemperaturecontrol,butitrequirescarefulconsiderationoffactorssuchaslaserpower,beamdiameter,andexposuredurationtoavoidunwantedeffectsonthespecimen. 2.3InductionHeating: Inductionheatingutilizeselectromagneticinductiontoheatspecimens.Analternatingcurrentispassedthroughacoilsurroundingthespecimen.Thecha