3D打印結(jié)構(gòu)柱偏壓性能試驗(yàn)研究

3D打印結(jié)構(gòu)柱偏壓性能試驗(yàn)研究AbstractWiththerapiddevelopmentof3Dprintingtechnology,theapplicationof3Dprintedstructuresinengineeringhasbeenwidelyconcerned.Theresearchonthemechanicalbehaviorof3Dprintedstructuresisbecomingmoreandmoreimportant.Inthispaper,theaxialcompressionbehaviorof3Dprintedcolumnwithdifferentprintingparameterswasexperimentallystudied.Bycomparingtheexperimentalresults,theeffectofprintingparametersonthecompressiveperformanceof3Dprintedcolumnwasanalyzed.Meanwhile,thefailuremechanismof3Dprintedcolumnwasinvestigatedbyscanningelectronmicroscope(SEM)analysis.Keywords:3Dprintingtechnology;printedstructures;axialcompressionbehavior;printingparameters;failuremechanism.IntroductionWiththedevelopmentof3Dprintingtechnology,theapplicationof3Dprintedstructuresinengineeringhasattractedmuchattention.Comparedwithtraditionalmanufacturingmethods,3Dprintingtechnologyhastheadvantagesoflowwaste,highprecision,fastspeed,andflexibledesign.3Dprintingtechnologyhasbeenappliedinvariousfieldssuchasaerospace,architecture,andmedicalengineering.However,theperformanceof3Dprintedstructuresisstillanurgentproblemtobesolved.Duetothelayeredmanufacturingprocess,themechanicalpropertiesof3Dprintedstructuresaredifferentfromtraditionalstructures.Theanisotropyandthestructuraleffectoftheprintedlayershaveagreatinfluenceonthemechanicalbehaviorof3Dprintedstructures.Toensurethesafetyandreliabilityof3Dprintedstructures,itisnecessarytostudythemechanicalbehaviorof3Dprintedstructures.Therefore,thispaperfocusesontheaxialcompressionbehaviorof3Dprintedcolumnswithdifferentprintingparameters.MaterialsandMethodsMaterialsThe3DprintedcolumnsweremadeofPLAfilament.ThePLAfilamentwaspurchasedfromacommercialsupplier.ThespecificationsofthePLAfilamentareshowninTable1.Table1SpecificationsofPLAfilamentFilamentdiameter1.75mmPrintingtemperature190-220°CPrintingspeed30-90mm/sDensity1.24g/cm^3Tensilestrength58MPaElongationatbreak7%Methods3DprintingThe3DprintedcolumnsweredesignedandprintedusingCrealityCR-103Dprinter.TheprintingparametersweresetasshowninTable2.Table2PrintingparametersParameterValueLayerheight0.2mmInfilldensity30%InfillpatternGridPrintingspeed45mm/sAxialcompressiontestTheaxialcompressiontestsof3Dprintedcolumnswereconductedusingauniversaltestingmachine(Instron5566).ThetestwascarriedoutinaccordancewithASTMD695standard.Theloadingratewas2mm/min.Thedeformationandloadwererecordedduringthetest.Scanningelectronmicroscope(SEM)analysisAfterthecompressiontest,thefracturedsurfaceofthe3DprintedcolumnswasobservedusingSEM(HitachiS-4800).Theobservationwasconductedtoinvestigatethefailuremechanismof3Dprintedcolumns.ResultandAnalysisInfluenceofprintingparametersonaxialcompressionbehaviorTheaxialcompressionbehaviorof3Dprintedcolumnswithdifferentprintingparameterswasinvestigated.Theprintingparametersvariedintermsofprintingtemperature,printingspeed,andlayerheight.Figure1showstheload-deformationcurvesof3Dprintedcolumnswithdifferentprintingtemperatures.Itcanbeseenthatthecolumnsprintedat200°Cand220°Chadhighercompressivestrengththanthecolumnsprintedat190°C.Thefailuremodeofthecolumnsprintedat190°Cwastheinstabilityofthetoplayers,whilethecolumnsprintedat200°Cand220°Cshowedplasticdeformationbeforefailure.Figure2showstheload-deformationcurvesof3Dprintedcolumnswithdifferentprintspeeds.Itcanbeseenthatthecolumnsprintedat30mm/sand45mm/shadhighercompressivestrengththanthecolumnsprintedat60mm/sand90mm/s.Thefailuremodeofthecolumnsprintedat30mm/sand45mm/swasacombinationofplasticdeformationandsnappingfailure,whilethecolumnsprintedat60mm/sand90mm/sshowedinstabilityofthetoplayers.Figure3showstheload-deformationcurvesof3Dprintedcolumnswithdifferentlayerheights.Itcanbeseenthatthecolumnsprintedat0.2mmlayerheighthadhighercompressivestrengththanthecolumnsprintedat0.3mmlayerheight.Thefailuremodeofthecolumnsprintedat0.2mmlayerheightwasthecombinationofplasticdeformationandsnappingfailure,whilethecolumnsprintedat0.3mmlayerheightshowedinstabilityofthetoplayers.FailuremechanismFigure4showstheSEMimagesofthefracturedsurfaceofa3Dprintedcolumn.Itcanbeseenthatthemicrostructureexhibitedalaminatedstructure.Thelayerinterfacewasclearlyvisible.Thefracturesurfaceshowedmultiplefractureorigins,whichweremostlylocatedatthelayerinterface.Thelargevoidsinthestructuremaycausestressconcentration,whichiscausedbydelaminationofthelayers,leadingtocracksandpropagationalongthelayerinterface.ConclusionInthispaper,theaxialcompressionbehaviorof3Dprintedcolumnswithdifferentprintingparameterswasexperimentallystudied.Theeffectofprintingparametersonthecompressiveperformanceof3Dprintedcolumnwasanalyzed.Itwasfoundthattheprintingparametershaveasignificantimpactonthecompressivestren