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外文翻译碳纤维增强砖钻削分层的研究.doc

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外文翻译碳纤维增强砖钻削分层的研究.doc

附录A外文翻译-原文部分STUDYOFDELAMINATIONINDRILLINGCARBONFIBERREINFORCEDPLASTICSCFRPUSINGDESIGNEXPERIMENTSJPDAVIM,PEDROREISDEPARTMENTOFMECHANICALENGINEERING,UNIVERSITYOFAVEIROCAMPUSSANTIAGO,3810193AVEIRO,PORTUGALABSTRACTINTHISPAPERISPRESENTEDANEWCOMPREHENSIVEAPPROACHTOSELECTCUTTINGPARAMETERSFORDAMAGEFREEDRILLINGINCARBONFIBERREINFORCEDEPOXYCOMPOSITEMATERIALTHEAPPROACHISBASEDONACOMBINATIONOFTAGUCHI_STECHNIQUESANDONTHEANALYSISOFVARIANCEANOVAAPLANOFEXPERIMENTS,BASEDONTHETECHNIQUESOFTAGUCHI,WASPERFORMEDDRILLINGWITHCUTTINGPARAMETERSPREFIXEDINANAUTOCLAVECARBONFIBERREINFORCEDPLASTICCFRPLAMINATETHEANOVAISEMPLOYEDTOINVESTIGATETHECUTTINGCHARACTERISTICSOFCFRP_SUSINGHIGHSPEEDSTEELHSSANDCEMENTEDCARBIDEK10DRILLSTHEOBJECTIVEWASTOESTABLISHACORRELATIONBETWEENCUTTINGVELOCITYANDFEEDRATEWITHTHEDELAMINATIONINACFRPLAMINATETHECORRELATIONWASOBTAINEDBYMULTIPLELINEARREGRESSIONFINALLY,CONFIRMATIONTESTSWEREPERFORMEDTOMAKEACOMPARISONBETWEENTHERESULTSFORESEENFROMTHEMENTIONEDCORRELATION_2002ELSEVIERSCIENCELTDALLRIGHTSRESERVEDKEYWORDSDRILLING;CARBONFIBERREINFORCEDPLASTICS;DELAMINATIONFACTOR;TAGUCHI_STECHNIQUES;ANALYSISOFVARIANCE1INTRODUCTIONOWINGTOTHEGROWINGUSEOFCOMPOSITEMATERIALS,SPECIFICALLYTHEFIBERREINFORCEDPLASTICSFRPOUTSIDETHEDEFENCEINDUSTRYANDTHEAEROSPACEINDUSTRY,THEUNITCOSTREPLACESTHEPERFORMANCEATANYCOSTASTHEMAINCONCERNFORPRODUCTIONSO,THEPRODUCTIONTECHNOLOGIES,ESPECIALLYTHEMACHININGOFCOMPOSITES,AREASSUMINGAMOREANDMORESIGNIFICANTROLEASTHEYCONDITIONTHEECONOMICVIABILITYOFTHEPRODUCTMACHININGCOMPOSITEMATERIALSISARATHERCOMPLEXTASKOWINGTOITSHETEROGENEITY,HEATSENSITIVITY,ANDTOTHEFACTTHATREINFORCEMENTSAREEXTREMELYABRASIVECONVENTIONALMACHININGMETHODSSHOULDBEADAPTEDINSUCHAWAYTHATTHEYDIMINISHTHERMALANDMECHANICALDAMAGEDRILLINGISAFREQUENTLYPRACTICEDMACHININGPROCESSININDUSTRYOWINGTOTHENEEDFORCOMPONENTASSEMBLYINMECHANICALPIECESANDSTRUCTURESTHEDRILLINGOFLAMINATECOMPOSITEMATERIALSISSIGNIFICANTLYAFFECTEDBYTHETENDENCYOFTHESEMATERIALSTODELAMINATEANDTHEFIBERSTOBONDFROMTHEMATRIXUNDERTHEACTIONOFMACHININGFORCESTHRUSTFORCEANDTORQUEMANYAUTHORS1–3,WHENREPORTINGABOUTTHEDRILLINGOFLAMINATEDCOMPOSITEMATERIALSBYCONVENTIONALTOOLS,HAVESHOWNTHATTHEQUALITYOFTHECUTSURFACESISSTRONGLYDEPENDENTONTHEDRILLINGPARAMETERS,TOOLGEOMETRYANDTOOLMATERIALANINAPPROPRIATECHOICEOFTHESEPARAMETERSCANLEADTOUNACCEPTABLEMATERIALDEGRADATION,SUCHASFIBERPULLOUT,MATRIXCRATERING,THERMAL江苏大学毕业设计1DAMAGEANDDELAMINATIONAMONGTHEDEFECTSCAUSEDBYDRILLING,DELAMINATIONAPPEARSTOBETHEMOSTCRITICALLAMINATEDFIBERREINFORCEDPLY_SUNDERMACHININGFORCESARESUBJECTTOTHERISKOFINTERLAMINARCRACKPROPAGATION,CALLEDDELAMINATIONKOENIGETAL,STUDIEDIN1985THEMACHININGOFFIBERREINFORCEDPLASTICSANDCONCLUDEDTHATAHIGHFEEDRATEOFDRILLINGWILLCAUSEACRACKAROUNDTHEEXITEDGEOFTHEHOLE4MILLERPRESENTEDIN1987ADATABASEONOPTIMUMCUTTINGPARAMETERSFORDRILLINGHOLESWITHMINIMUMLOCALMACHININGDAMAGE5HOCHENGANDPUW1,IN1992PRESENTEDASTUDYOFTHECHIPFORMATIONANDASSESSESTHEMACHINABILITYOFTWOCOMPOSITEMATERIALSTHERMOSETBASEDANDTHERMOPLASTICSBASEDANDCONCLUDEDTHATFROMCUTTINGCHIPSTHEFORMERPRESENTSALARGEAMOUNTOFDEFORMATIONINCHIPFORMATION,WHILETHELATTERTENDSTOFRACTUREHEALSONOTICEDTHATCARBON/ABSISSUPERIORTOCARBON/EPOXYFORSURFACEQUALITYANDBOTHHOLEEDGESCHAMBERSANDBISHOP6IN1995INVESTIGATEDTHEEFFECTOFTHECUTTINGPARAMETERSONDRILLINGCARBON/EPOXYANDCARBON/PEEKANDCONCLUDEDTHATTHEDRILLINGOFCARBONCOMPOSITESISDEPENDENTUPONTHECHARACTERISTICSOFTHEMATRIXANDTHEHELICALPCDDRILLGEOMETRYGAVETHEBESTOVERALLPERFORMANCEINADDITIONTOTHEPROBLEMSOFTOOLWEAR,ITISVERYDIFFICULTTOACHIEVETHEQUALITYOFSURFACENEEDEDFORTHEACCURATEASSEMBLYOFCOMPONENTSINMECHANICALSTRUCTURESLINETAL7IN1996,CARRIEDOUTASTUDYONDRILLINGOFCARBONFIBERREINFORCEDCOMPOSITEATHIGHSPEEDANDCONCLUDEDTHATANINCREASEOFTHECUTTINGVELOCITYLEADSAINCREASINGOFTHEDRILLWEARINTHISWAYTHEFACTOFINCREASINGTHEWEAROFDRILLCAUSESARISINGOFTHRUSTFORCEWENCHOUCHEN3IN1997STUDIEDTHEVARIATIONSOFCUTTINGFORCESWITHORWITHOUTONSETDELAMINATIONDURINGTHEDRILLINGOPERATIONSANDCONCLUDEDTHATTHEDELAMINATIONFREEDRILLINGPROCESSESMAYBEOBTAINEDBYTHEPROPERSELECTIONSOFTOOLGEOMETRYANDDRILLINGPARAMETERSPIQUETETAL8IN2000CARRIEDOUTASTUDYOFDRILLINGTHINCARBON/EPOXYLAMINATESWITHTWOTYPESOFDRILLS,AHELICALDRILLANDADRILLOFSPECIALGEOMETRY,ANDCONCLUDEDTHATBOTHDRILLSLEADSADAMAGEATTHEENTRANCEINTHEWALLANDTHEEXITOFTHEHOLE,WITHTHEEXCEPTIONOFSPECIALGEOMETRYDRILLWHICHISPOSSIBLEASIGNIFICANTREDUCTIONINTHEFINALDAMAGEENEMUOHETAL9IN2001,REALIZETHATWITHTHEAPPLICATIONOFTHETECHNIQUEOFTAGUCHIANDOTHERMETHODS,WEREPOSSIBLETOACHIEVETHECUTTINGPARAMETERSTHATALLOWEDTHEABSENCEOFDAMAGEINTHEDRILLINGOFFIBERREINFORCEDPLASTICSALLTHEABOVEWORKSCONTRIBUTESTOTHEPRACTICEOFCUTTINGCOMPOSITEMATERIALS,BUTTHEYDONOTSHOWTHEBASICMECHANISMSOFCUTANDTHECHARACTERIZATIONOFTHEMACHINABILITY2EXPERIMENTALPROCEDURE21MEANSANDMATERIALS许静波干燥机(组)设计2INORDERTOACHIEVETHEOBJECTIVEOFTHISEXPERIMENTALWORK,MAINLYTHEESTABLISHINGOFCORRELATIONSBETWEENTHECUTTINGCONDITIONSWITHTHEDELAMINATION,MACHININGISSUESWEREEFFECTUATEDWITHDIFFERENTCUTTINGCONDITIONS,ANDWEREUSEDCARBONFIBERREINFORCEDPLASTICSCFRP_SEPOXYMATRIXREINFORCEDWITH55OFCARBONFIBERFORTESTSTHISCOMPOSITEMATERIALWASPRODUCEDBYAUTOCLAVEWITHAFIBERORIENTATIONOF0/90DEGREES,ASWECANOBSERVEONFIG1THEEXPERIMENTSHADBEENCARRIEDOUTINANAUTOCLAVELAMINATEMADEUPOF16LAYERSOFFIBERSWITH4MMOFTHICKNESS,USINGTHREEDIFFERENTTYPESOF5MMDIAMETERDRILLSPRESENTEDINTHEFIG2AHELICALFLUTEHIGHSPEEDSTEELHSSDRILLR41550500508C0,AFOURFLUTECEMENTEDCARBIDEK10DRILLR95001H10FANDFINALLYAHELICALFLUTEK10CARBIDEDRILLR4155050030AC0,ACCORDINGTOISO1832ADRILLINGMACHINEWITH2,2KWSPINDLEPOWERANDAMAXIMUMSPINDLESPEEDOF2500RPMWASUSEDTOPERFORMTHEEXPERIMENTSTHEUSEDDRILLSHAVEAN118_POINTANGLETHESQUEEZEOFTHELAMINATE,INTHEPRESSOFJAWOFTHEDRILLINGMACHINEWASMADEBYASYSTEMOFCLAMPS,TOMAKESURETHATVIBRATIONSANDDISPLACEMENTDOESNOTEXIST,ASWECANOBSERVEINFIG3THEDAMAGEAROUNDTHEHOLESWASMEASUREDWITHASHOPMICROSCOPE,MITUTOYOTM500,WITH30_MAGNIFICATIONAND1LMRESOLUTION22PLANOFEXPERIMENTSTAGUCHI’STECHNIQUESTAGUCHI_STECHNIQUESHAVEBEENUSEDWIDELYINENGINEERINGANALYSISTHESETECHNIQUESCONSISTOFAPLANOFEXPERIMENTSWITHTHEOBJECTIVEOFACQUIRINGDATAINACONTROLLEDWAY,EXECUTINGTHESEEXPERIMENTS,INORDERTOOBTAININFORMATIONABOUTTHEBEHAVIOROFAGIVENPROCESSTHETREATMENTOFTHEEXPERIMENTALRESULTSISBASEDONTHEANALYSISAVERAGEANDTHEANALYSISOFVARIANCEANOVA10–13FORTHEELABORATIONOFEXPERIMENTSPLANWEUSEDTHEMETHODOFTAGUCHIFORTWOFACTORSATTHREELEVELSBYLEVELSWEMEANTHEVALUESTAKENBYTHEFACTORSTABLE1INDICATESTHEFACTORSTOBESTUDIEDANDTHEASSIGNMENTOFTHECORRESPONDINGLEVELSTHEARRAYCHOSENWASTHEL924,WHICHHASNINEROWSCORRESPONDINGTOTHENUMBEROFTESTSEIGHTDEGREESOFFREEDOMWITHTWOCOLUMNSATTHREELEVELS,ASSHOWNINTABLE2THEFACTORSANDTHEINTERACTIONSAREASSIGNEDTOTHECOLUMNSTHEPLANOFEXPERIMENTSISMADEOFNINETESTSARRAYROWSINWHICHTHEFIRSTCOLUMNWASASSIGNEDTOTHECUTTINGVELOCITYEVTANDTHESECONDCOLUMNTOTHEFEEDRATEEFTANDTHEREMAININGWEREASSIGNEDTOTHEINTERACTIONSTHERESPONSETOBESTUDIEDISTHEDELAMINATIONFACTOREFDTINCFRPLAMINATE3RESULTSANDDISCUSSION江苏大学毕业设计331INFLUENCEOFTHECUTTINGPARAMETERSINTHEDELAMINATIONFACTORTHEDAMAGEAROUNDTHEHOLESWASMEASUREDUSINGASHOPMICROSCOPEMITUTOYOTM500,FOLLOWINGTHESCHEMAPRESENTEDINTHEFIG4AFTERMEASURINGTHEMAXIMUMDIAMETEREDMAXTINTHEDAMAGEZONE,IEAROUNDEACHHOLE,WECARRIEDOUTTODETERMINEDTHEVALUEOFTHEDELAMINATIONFACTOREFDTTHISFACTORISDETERMINEDBYTHERATIOTHEMAXIMUMDIAMETEREDMAXTOFTHEDAMAGEZONETOTHEHOLEDIAMETEREDTTHEVALUEOFDELAMINATIONFACTOREFDTCANBEOBTAINEDBYTHEFOLLOWINGEQUATIONFDDMAXDE1TBEING,DMAXTHEMAXIMUMDIAMETEROFTHEDAMAGEHOLEINLMANDDTHEDIAMETEROFTHEHOLEINLMTABLE3SHOWSTHERESULTSOFTHEDELAMINATIONFACTOREFDT,FORTHETHREESETSOFDRILLINGTESTS,OBTAINEDBYTHEEQ1INFUNCTIONOFTHECUTTINGPARAMETERSINTHEFIGS5AND6WECANOBSERVETHEEVOLUTIONOFTHEDELAMINATIONFACTOREFDTWITHTHEFEEDFORTHEDIFFERENTCUTTINGSPEEDVALUESINFIG5WECANEVIDENCETHATTHEFDINCREASESWITHTHEFEEDRATE,ANDWITHTHECUTTINGSPEEDACCORDINGTOTHEGRAPH,WECANOBSERVETHATTHECARBIDEDRILLPRESENTSABETTERPERFORMANCETHANTHEHSSDRILL,IEUNDERTHESAMECUTTINGCONDITIONSCUTTINGSPEEDANDFEEDRATE,THEHSSDRILLCAUSESALWAYSABIGGERDELAMINATIONFACTOR,WITCHMEANSHIGHERDAMAGEINTHECOMPOSITELAMINATEWEALSOCANOBSERVETHATINFIG6,THEFDINCREASESWITHTHEFEEDRATE,ANDWITHTHECUTTINGSPEEDWECANEVIDENCETHATTHEHELICALFLUTEK10DRILLPRESENTSABETTERPERFORMANCETHANTHEFOURFLUTEK10DRILL,IEUNDERTHESAMECUTTINGCONDITIONSCUTTINGSPEEDANDFEEDRATETHEFOURFLUTEDRILLCAUSESALWAYSABIGGERDELAMINATIONFACTOR,EXCEPTINTHETESTWHICHHAVETHEHIGHERFEEDRATEANDTHELOWERCUTTINGVELOCITYGEOMETRICALDIFFERENCESBETWEENTHETWOTYPESOFDRILLMAYBETHEREASONFORTHISFACTWITHANOPTICALMICROSCOPEOMWASPOSSIBLETOOBSERVETHEDAMAGEAROUNDTHEHOLES,ANDNOTICETHEINFLUENCEOFTHECUTTINGVELOCITYEVTHAVEONTHEDELAMINATIONFACTOREFDT,ASWECANSEEONFIG7INFIG7,WECANEVIDENCETHAT,FORACONSTANTAFEEDRATE,ANINCREASEOFTHECUTTINGVELOCITYINCREASESTHEDELAMINATIONFACTOREFDTASWELLANANALYSISOFVARIANCEOFTHEDATAWITHTHEDELAMINATIONFACTOREFDTINCFRPLAMINATE,WITHTHEOBJECTIVEOFANALYZINGTHEINFLUENCEOFTHECUTTINGVELOCITYEVT,OFFEEDRATEEFTONTHETOTALVARIANCEOFTHERESULTSTHESTATISTICALTREATMENTOFTHEDATAWASMADEINTWOPHASESTHEFIRSTPHASEWASCONCERNEDWITHTHEANALYSISOFVARIANCEANDTHEEFFECTOFTHEFACTORSANDOFTHEINTERACTIONSTHESECONDPHASEALLOWEDUSTOOBTAINTHECORRELATIONBETWEENTHEPARAMETERSVANDFTABLES4–6SHOWTHERESULTSOFTHEANALYSISOFVARIANCEWITHTHEDELAMINATIONFACTOREFDTINCFRPLAMINATEFROMTHEANALYSISOFTABLE4,WECANOBSERVETHATTHECUTTINGVELOCITYEP725TANDTHEFEED

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