對三維編織鋼纖維增強混凝土靜力學性能及其沖擊壓縮性能的研究.pdf

1、南京航空航天大學碩士學位論文對三維編織鋼纖維增強混凝土靜力學性能及其沖擊壓縮性能的研究姓名：程宇申請學位級別：碩士專業(yè)：固體力學指導教師：陳國平201012對三維編織鋼纖維增強混凝土靜力學性能及其沖擊壓縮性能的研究IIAbstractAsoneofthemostwidelyusedengineeringmaterialsconcreteareacterisedbytheinherentlowtensilestrengthbrittlen

2、ess.Mixinginacertaincontentofsteelfibersisawaytoovercomethisdefect.Researchhasshownthatstrengthofsteelfiberreinfcedconcrete(SFRC)iscloselyrelatedtofibervolumepercentagelengthdiameterratiofiberdistribution.Highfibervolume

3、percentagelargefiberlengthdiameterratiowellproptioneddistributionarebeneficialtothestrengthtoughnessofSFRCwhichconsequentlyleadtoexcellentantiblastantiperationperfmanceobviousreductionofexplosioninducedspalling.Thisresea

4、rchaimsatintegrating3DbraidingtechniquewithSFRCdeveloping3Dbraidedsteelfiberreinfcedconcrete(3DBSFC).Steelfibersarefirstlybraidedputintomouldsthenslurryisinfiltratedin.SincefibersarenotmixedinfibervolumepercentageinBSFCi

5、snotlimitedbythemixprocessasinSFRCthefiberientationdistributionalsocanbedesigned.FurthermeasbraidedsteelfiberscanwkintegrallyBSFCisexpectedtoexhibitedbetterperfmancethanSFRC.Thispaperattemptstoimplement3DBSFCgetspecimens

6、ofBSFCsubsequentlyinvestigatethemechanicalperfmance.Oneofthemanufacturingproceduresofmaking3DBSFCinclude:1)layfibersintwoperpendiculardirectionswithinaplane2)acertainamountofslurryisinfiltratedin3)layanotherfiberlayerinf

7、iltrateslurry4)afterallofthehizontalfibersareplacedverticalfibersareed.Theotherinclude:1)braid3Dsteelframwks2)lay3Dsteelframewkintomould3)infiltrateslurryshake.Thenspecimensof3DBSFCwithsteelfibervolumepercentage(Vf)of0(S

8、C0)5%(SC05)10%(SC10)wereprepared.Specimensweretesteduniaxiallybyamultifunctionservocontrolledtestingmachineundertwotypesofquasistaticlowstrainrate(104s1102s1).Thewholestressstraincurvestrengthtoughnesscompressionelastici

9、tymoduluswereobtained.Compressiveacteristicsof3DBSFCinfluencesofsteelfibervolumepercentagestrainrateonthebasicmechanicalperfmanceswereinvestigated.DynamiccompressivepropertiesofspecimensweretestedbyaSplitHopkinsonPressur

10、eBar(SHPB)of75mmdiameterdifferentstrainratelevelswereincluded.Somedataabout3DBSFCatdifferentstrainratesarereceivede.gdynamicstressstrainrelationsdynamicincreasingfacttheeffectoffibercontenttypeoffiberonthedynamicproperti

11、esofmaterialsdynamicfailuremodes.Basedontheexperimentalnumericalresultstheconstitutivemodelf3DBSFCisresearched.UsingtheZWTmodelconsideringthedamageeffectfconstitutivefittingtheHJCmodelfnumericalsimulationrespectivelycred