KEVLAR 凯夫拉纤维课件.ppt

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1、KEVLAR无机1202严婷婷3120703028Whatiskevlar?Kevlarfiberisthecommercialnameforpoly(p-phenyleneterephtalamide).Itisanorganicfiberinthearomaticpolyamidefamily.Kevlarhashighstrength,stiffness,toughness,andthermalstabilityHistoryKevlardevelopedbyStephanieKwolekatDuPontin1965,thishigh-strengthmaterial

2、wasfirstcommerciallyusedintheearly1970sasareplacementforsteelinracingtires.By1978,theUSArmytappedDuPonttoproduceKevlarfortheirflakjacketsandhelmets.TraditionalarmorBulletproofVestPrincipleOfBulletproofTestsshowthatkevlarbodyarmorhasfivekindsofenergyabsorptionway:1.fabrictensiledeformation;

3、（织物的拉伸变形）.2.Thedestructionofthisfabric;（织物毁坏）3.Heat;（热能）4.thesoundenergy;（声能）⒌projectiledeformation.（弹体的形变）Kevlarisawell-knowncomponentofpersonalarmorsuchascombathelmets,ballisticfacemasks,andballisticvests.ThePASGThelmetandvestusedbyUnitedStatesmilitaryforcessincethe1980sbothhaveKevlarasa

4、keycomponent,asdotheirreplacements.凯夫拉装备是著名的单人作战必备装备，例如装甲作战头盔，弹道口罩和防弹背心。自1980年以来，美国军事所用的PASGT头盔和背心都有凯夫拉作为重要组成部分。GeneralFeaturesofKevlarAramidFiberHighTensileStrengthatLowWeightLowElongationtoBreakHighModulus(StructuralRigidity)LowElectricalConductivityHighChemicalResistanceLowThermalShrink

5、ageHighToughness(Work-To-Break)ExcellentDimensionalStabilityHighCutResistanceFlameResistant,Self-Extinguishing抗拉强度高质量轻结构刚度高导电性低耐化学性高热收缩性低韧性高尺寸稳定性好高阻抗性耐燃、自熄性KevlarFiberManufacturing1.Thepreparationofpolymer2.Thespinning:thedryspray-wetspinningprocess1.RopesandCablesofKevlarAramidFiberRopesa

6、ndCableswithKevlarFiber:HighStrength,andLightWeightApplications:AntennaeGuideWires,Fishline,IndustrialandMarineutilityropes,LiftingSlings,EmergencyTowLines,NettingandWebbingWidelyApplications：2.ShoesNikeusedKevlarinshoesforthefirsttime.ItlaunchedtheEliteIISeries,withenhancementstoitsearlie

7、rversionofbasketballshoesbyusingKevlarintheanterioraswellastheshoelaces.ThiswasdonetodecreasetheelasticityofthetipoftheshoeincontrasttonylonusedconventionallyasKevlarexpandedbyabout1%againstnylonwhichexpandedbyabout30%.3.SportsequipmentIntabletennis,pliesofKev