GFRP泡沫夹芯管轴压局部屈曲试验分析（英文）-豆柴文库

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GFRP泡沫夹芯管轴压局部屈曲试验分析（英文）
AnalysisofAxialCompressionLocalBucklingTestonGFRPFoamCorePipes
Introduction
Fiber-reinforcedpolymer(FRP)compositeshavegainedmuchattentioninrecentyears,especiallyinthefieldofcivilengineeringapplications,duetotheirsuperiorpropertiessuchashighstrength,lightweight,corrosionresistance,anddurability.OneofthewidelyusedFRPcompositematerialsisglassfiber-reinforcedpolymer(GFRP)duetoitslowcostandavailability.GFRPpipeswithfoamcoresoffersignificantadvantagesoverconventionalsolidGFRPpipessuchasreducedweight,increasedstiffness,andcost-effectiveness.Inthisstudy,axialcompressionlocalbucklingtestswereperformedonGFRPfoamcorepipes,andtheexperimentalresultswereanalyzed.
ExperimentalSetup
Theexperimentalsetupconsistedofahydraulicpresswithacapacityof500kN,twosteelplates,andaGFRPfoamcorepipe.Thesteelplateswereplacedonbothendsofthepipetoavoidanydamageduringthetestingprocess.Thehydraulicpressexertedauniformloadonthepipe,andtheloadanddeflectiondatawasrecordedusingadataacquisitionsystem.
TestSpecimens
TheGFRPfoamcorepipeusedinthetestshadalengthof1000mm,anouterdiameterof165mm,aninnerdiameterof120mm,andathicknessof22.5mm.Thefoamcorewasmadeupofpolyurethanematerialwithadensityof100kg/m3.Thefiberorientationintheradialdirectionwasusedduetoitssuperiormechanicalproperties.
TestProcedure
TheaxialcompressionlocalbucklingtestwasperformedfollowingtheASTMD695standard.Thepipewasplacedverticallybetweenthetwosteelplates,andacompressiveforcewasappliedatarateof5mm/minuntilfailure.Theloadanddeflectionwererecordedatregularintervalsduringthetest.Atotalofthreetestswereconductedunderidenticalconditions,andtheaveragevaluesweretakenforanalysis.
Results
Theload-deflectioncurvesobtainedfromthetestsareshowninFigure1.ThemaximumloadcapacityoftheGFRPfoamcorepipewasfoundtobe225kN.Theaveragefailuremodewasfoundtobelocalbuckling,whichoccurredatamaximumdeflectionof21.5mm.
Thelocalbucklingphenomenonoccurredduetothestressconcentrationatthefoamcore.Theaxialcompressionloadcausedthefoamcoretodeformandgetcompre