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1、CompositeStructuresVol.38,No.l-4,pp.351-359,199781997ElsevierScienceLtd.AllrightsreservedPrintedinGreatBritain0263-8223/97/$17.00+0.00PII:SO263-8223(97)00070-6OptimaldesignofcompositehoodwithreinforcingribsthroughstiffnessanalysisDae-YoungKwak,=*”*Jin-HoJ
2、eong,bJae-SeungCheon’&Yang-‘IbekIm”“KiaMotorCompany,Kwangmyungshi,Kyunggido781-1,SouthKoreabHyundaiMotorCompany,Namyangmyun,Whasunggun,Kyunegido445-850,SouthKorea‘ComputerAidedMaterialsProcessingLaboratoryDepartmentofMechanicalEngineering,KoreaAdvancedIns
3、tituteofScienceandTechnology,Taejon305-701,SouthKoreaFiberglassreinforcedcompositeslikesheetmoldingcompounds(SMC)haverecentlybeenwidelyusedinthefabricationoftwo-pieceautomobilehoodsforpassengercars.Inthepresentinvestigation,aone-piececompositehoodwithrein
4、forcingribswasoptimallydesignedandmanufacturedbyresintransfermoldinginordertoreducemanufacturingcost.Inordertoobtaintheoptimaldesign,stiffnessanalysesfordeflectionsduetoself-weight,oilcanning,andtorsiontestconditionswerecarriedoutbyapplyingtheABAQUWStanda
5、rdprogram.Basedontheseanalyses,thethicknessdimensionofthecompositehoodrequiredtomaintainastiffnesscomparabletoaconventionalsteelhoodwasdetermined.Foroptimizationstudiesoftheweightreductionofthecurrentlyproposedone-piececompositehoodwithreinforcingribs,IDE
6、SIGNprogramwasemployed.Basedonarecursivequadraticprogrammingtechnique,thethicknessdimensionsofthereinforcingribswereoptimized.Thedeflectionratiosbetweenfiberglassreinforcedcompositeandconventionalsteelhoodswereminimizedintheoptimizationstudies.Fromthepres
7、entstudies,itwasfoundthattheweightsavingeffectobtainedbyintroducingtheoptimallydesignedone-piececompositehoodwas37%comparedtotheconventionalsteelhood.Thisrangedapproximatelyfrom30to40%forcompositehoodsmanufacturedbyresintransfermolding,dependingonthecompo
8、sitematerialsused.Throughthesestudies,itwasconfirmedthattheone-piececompositehoodwasapreferabledesignandmanufacture,comparedtocurrentlyusedcompositehoodmadeintwopieces,intermsofweightreductionsandmanufacturingcostwi
