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1、哈尔滨工业大学工程硕士学位论文AbstractMakingsurethatthestrengthandstiffnessoftheaerospacestructurescanmeetthebasicrequirementsforfundamentaluseisthemostimportantissuethateveryrelatedresearcherconcerns.TheCarbonFiberReinforcedPolymercansatisfyourneedtoachievethisgoal.Itcannotonlygreatlydecreasethewe
2、ightoftheaerospacestructure,butalsocanprovideevengreaterstrengthandstiffnessthantraditionalmaterialssuchassteel.However,theresearchofthemechanicsofthisnewkindofmaterialisstillundeveloped,letalonethebucklingbehaviorofit.Forthisreason,acompressionexperimentofCFRPtubesisstatedinthisthes
3、is.Byanalysisthedateobserved,afiniteelementmodelandabucklingformulaareestablished.Theformulashowshighagreementwiththeexperimentresult.Thismasterthesismainlyincludesthefollowingaspects:1.Inordertobetterunderstandthemicroscopicmechanicsbehavior,suchastheultimatestrength,stiffness,failu
4、remodelofmacroscopicandmicroscopic,acompressiontestforshortCFRPtubesisexecuted.Inordertolearnthebucklingbehavior,anotherbucklingtestforslenderpipesarealsoincludedinthispassage.2.Thedomesticandinternationalresearchresult，includingtheproductionprocess，basiccomponents,finiteelementmodel
5、,andexperimentmethod,havebeendiscussed.What’smore,severalkindsofprogressivedamagemodelsarealsointroducedingreatdetail.Aimingatbetterparaphrasethedifferencemechanicbehaviorundertensionandcompression,theresearchprocedureofwind-filamentcompositeisalsointroduced.TheChamisC.Cformulaisreco
6、mmendedtocalculatethemicrostrengthandstiffnessofthebraidyarn.TheconstantderivedfromthisformulacanbeusedtoforecastthemacropropertiesoftheCFRPpipes.AUsermatsubroutinewhichcanbeembeddedintoANSYSfiniteelementsoftwareisprogrammed.Thissubroutinecanexactlysimulatetheelasticpropertiesofthese
7、pipes.3.Whenthewindanglerangesinaspecificscopeandtheslenderratioisnotveryhigh,thefiberandmatrixwillcrackbeforetheloadgettothemaxvalue.Insuchcase,thiskindofmaterialshowsnon-elasticpropertiesunderaxialcompression.Inordertobetterexplainthisphenomenon,aprogressivedamagemodelisintroduced.
8、BasedontheHa
