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Research_2

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Research_2Resear

    Research

Dec.2008,Volume2,No.12(SerialNo.13)JournalofMaterialsScienceandEngineering,ISS

    N1934-8959,USA

    ;Researchonthefailureoffiberreinforced

    ;aluminum.basedwiresforconductor

    ;WANGLingI

    ;.

    ;ZHAOHao-feng2YANKail.WUHong-yan2.WANGWeii ;flAmorphousandInformationCompositesLab.NanjingUniversi~oflnformationScienc

    e&Technology.Nanjing210044.China

    ;2DepartmentofMaterials.NanjingUniversi~oflnformationScience&Technology,

    Nanjing210044,China)

    ;Abstract:Thispaperdealswiththemorphologyand ;failureresistanceoffiberreinforcedaluminumwireusedfor ;conductor.Thestress.strainrelationshipoftestmaterialswas ;analyzed.Theresultsshowthatthiscompositewirehasan ;excellentfailureresistantperformance.

    ;Kevwords:conductors;compositewire;failureresistant

    ;performance

    ;1.IntrOductiOn

    ;Metalcompositewirebegantobeusedto

    ;substitutesteelcoreinoverheadedconductor4.5

    ;yearsagolJ_Thefunctionofthecoreintheconductoris ;mainlytobearthetensileloadoftheweightof ;conductor,wind,snowetc.Previousresearchesonthe ;tensilepropertiesofcompositewireshowthatitwas ;producedbyinfiltrationandhasunstablestrength[.

    ;Theboundaryinthecompositehasanimportantrole ;ontensilepropertiesandfailurestileofthewire[6-7J. ;Butfailureprocessofthecompositewireundertensile ;forcesisnotclearcompletely.Sothepaperfocuson

    ;theeffectoffiberbreakingonfailureprocessofcarbon ;fiberreinforcedwire

    ;2.Experiment

    ;6010A1alloywasusedasmatrixmaterialsand

    ;T300carbonfiberasreinforcementofcompositewires. ;Table1liststhechemicalcompositionof6010alloy. ;C0rrespondingauthor:WANGLing(1957),female,

    ;professor;researchfield:advancedmaterials.Email:neuhfz@

    ;163.corn.

    ;ThroughplasmamethodthefiberwascoatedwithSi02 ;Theplasmareactionisshowninequation(1) ;SIC14+2O2=SiO2+2C12r1)

    ;Fiberbunchwassurroundedwithmoltenmetalby ;themeansofinfiltration,inwhichthecarbonfiber

    pressurecabinto ;bunchwentthroughthemeltinagas

    ;forrnthecompositewireofdiameter3turn,inwhich ;thereis50vo1%carbonfibers.Itisdiscoveredthatthe ;fiberwithSiO2coatingsjointedcloselywithmatrix ;alloy,butwithoutnot.

    ;Table1Chemicalcompositionof6010alloy(wt%) ;TensiletestwasconductedwithInstrontester, ;withtensilerate0.4mm/min.Testsamplesofgauge ;lengthof40ITUT1werepreparedwithspecialtreatment ;oftheendofwiresinordertoavoidsamplesliding ;duringtensiletest.Themetallo?graphicspecimens ;werepreparedfordigitalopticalphaseconjugation ;(OLYMPUS-BH2)andSEMinspection.

    ;3.Resultsanddiscussion

    ;3.1Productionofload-displacementcurve ;Thetypicalcurveofloaddisplacementwas

    ;showninFig.1.Acordingtotheslopeofthecurvein ;Fig.1thetensileprocesscanbedividedintothree ;stages.Atthefirststage,whichislessthan550pmof ;displacement,theslopeoftheCHIVeisthebiggest.At ;thesecondstage(inthedisplacementrangeof550-650 ;29

    ;ResearchonthefaHureoffiberreinforeedaluminumbasedwiresforconductor ;m),theslopedecreases.Whenthedisplacementgoes ;over650gm,theslopechangestozero,whichisthe ;thirdstage.Inotherwords,thatisacompletefailure ;stage,asshowninFig.2.Thesecondstageshows ;evidentplasticfeatureofcompositewire.Fig.3shows ;themorphologyofthesampleatthesecond

    ;loaddisplacementstage.Itisdiscoveredthatthe ;fracturesappearinmanyfibers.Butatthefirststage, ;nofractureisfound.Thatistosay,atthisstagethe ;fibersinthewiresmainlybeartheload,whileatthe ;secondstagethematrixbegintobearload.Asthefiber ;breaks,itcannotunde~akeforcesonwiredirectly.In ;thissituation,theeffectofreinforcementbeginsto ;decrease.Thatis,atthesecondstage,themetalmatrix ;notonlytransmitsloadtofiber.butalsobears1oad. ;1000

;z800

    ;\600

    ;400

    ;0

    ;r

    ;200

    ;0

    ;450500550600650

    ;displacement/um

    ;Fig.1Load-displacementrelationshipofcompositewire ;30

    ;Fig.2Reviewofbrokenwire

    ;Fig.3MorphologyofwireX200

    ;3.2Analysisofload-displacementcurve ;Thestrengthofcompositecanbeexpressedin ;formula(1)asfollow[]:

    ;()-=(VfEr+VmE)VfEfz’/4rf(1)

    ;wherefistheboundarystress,Salengthto ;diameterratiooffiber.Itcanbeseenthatrightsecond ;terminformula(1)iszerowhennofiberbreaks.That ;isROMformula.Asthefibersbegintobreak,the ;strengthofcompositedecrease.Itismeasuredthat ;whenwirecontains50vo1%carbonfiberswithgood ;Si02coatings,thestrengthofwirebecomes1080MPa, ;andr.0.0065MPa.Puttingthesevaluesinto ;formula(1),wecanobtainstressstraincurvesas

    ;showninFig.4.Itcanbeseenthatassappears,the ;materialsshowanobviousplasticcharacteristic.Itis ;provedthatplasticdeformationofwiresisrelatedto ;fiberfracture.

    ;Fig.4Plasticdeformationofcomposite

    ;wirewithS(y-O,x-)

    ;(tobecontinuedonPage48)

    ;

    ;

    ;Influenceofhightemp

    ;eraturetreatmentofacti

    ;va

    ;

    ;tedcarbononperformanceOfsupercapacit0rs ;[12]YANGJing,LIuYafei,CHENXiaomei,eta1.Carbon

    ;electrodematerialwithhighdensitiesofenergyandpower ;ActaPJicoChimicaSinica,2008,2(1):13.

    ;[13]wANGY.,LUOJ.,wANGC.,eta1.Hybridaqueousenergy

    ;storagecellsusingactivatedcarbonandlithium-ion ;intercalatedcompoundsII,comparisonofLiMn2O4, ;LiCov3Nil/3MUl/302,andLiCoO2positiveelectrodes.Journal ;ofElectrochemicalsocie0,,2006,153:1425. ;[14]Hahn,M.,Barbieri,O.,Campana,F.P.,eta1.Carbon ;baseddouble.1ayercapacitorswithaproticelectrolyte ;solutions:thepossibleroleofintercalation/insertion ;processes.Applied,sicsA,2006,(2):633.

    Andrzej,L.andAngelikaO..NMethylN. ;[15

    ;propylpiperidiniumbis(trifluoromethanesulphony1) ;imideasanelectrolyteforcarbon.baseddouble.1ayer ;capacitors.JournalDPm*,erSore’ces,2007,172(11:487.

    ;[16Okamura,M..Introducingthenanogatecapacitors.

    ;PowerElectronicsSocietyLetter,2004,16(1):9. ;[17]Takeuchi,M.,Koike,K.,Maruyama,T.,eta1. ;Electrochemicalintercalationoftetraethylammonium ;(continuedfromPage30)

    ;4.Conclusion

    ;tetranuOroborateintoKOHtreatedcarbonconsistingof

    ;multigraphenesheetsforanelectricdoublelayer ;capacitor.Electrochemistry,1998.66:13l1. ;[18]Takeuchi,M.,Maruyama,T.,Koike,K.,eta1.Non.porous ;carbonforahighenergydensityelectricdoublelayer ;capacitor.Electrochemistry,200l,69:487. ;[19]Taira,A.,Ichiro,M.,Koji,Y.,eta1.Hi曲一energydensity

    ;hybridelectrochemicalcapacitorusinggraphitizable ;carbonactivatedwithK0Hf0rpositiveelectrode.Journal ;ofPowerSow’ces,2007,166(2):462.

    ;[20]Santhanam,R.andNoel,M..Effect0fsoIventsonthe ;intercalation/deintercalationbehaviourofmonovalent ;ionicspeciesfromnonaqueoussolventson

    ;polypropylenegraphitecompositeelectrode.JournalD

    ;owerSources.1997.66:47.

    ;[21]Dano,J.andSimonetC..Reactivityofgraphitewith ;carbondioxide:Anefficientformationofcarboxylated ;carbonmaterials.Journal0ElectroanalyticalChemistry, ;2004.564:l15.

    ;(EditedbyMalikandDonna)

    ;Thestress.strainrelationshipofcompositewire ;showsevidentplasticfeature.Theplasticdeformation ;ofwiresisrelatedtofiberfracture.Thewiremaynot ;immediatelyandcompletelydamagebecauseofthe ;functionofmeta1.Sothiscompositewirehasan ;excellentfailure.resistantperformance.

;References:

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    ;(EditedbyMalikandDonna)

    ;

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