复合材料胶接修理结构静强度分析方法分析

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1、上海交通大学硕士学位论文THESTRENGTHANALYSISMETHODOFADHESIVELYBONDEDCOMPOSITEREPAIRSTRUCTURESABSTRACTFromthe1960s,thecompositematerialhasbeenwidelyusedinmanyareasparticularlyonaircraftstructures.Meanwhile,therepairofcompositestructuresisbecomingincreasinglyimportant.Adhesivelybondedrepairisthemainrepairingmeth

2、od,includinglaprepairandscarfrepair.Thispaperstudiesthestrengthanalysismethodoftherepairedcompositestructuresbydouble-sidedrepairingandscarfrepairing.Twomodelswereestablishedincludinganalyticalmodelandfiniteelementmodeltoanalysisthestaticstrengthofthecompositeadhesivelybondedstructures.Theanalytic

3、almodelisa2-Dmodel,inwhichthecompositelayersareconsideredlinearelasticmaterial,andassumingthereisnosheardeformation,whilethereisonlysheardeformationintheadhesivematerial.Usingthemaximumstraincriterionfortheadhesivelayerandthefirstlayerfailurecriterionforthecompositematerial,thestrengthandthestress

4、distributionofthecompositeadhesivelybondedstructurescanbeobtained.TheFEAmodelisa3-Dprogressivedamagemodel,inwhichThecompositelaminateswasmodeledwiththeorthotropicconstitutive,andtheonsetofdamagewaspredictby3DHashin’sfiberfailurecriterion，Puck’smatrixfailurecriterionandYecriterion.Damagevariableswe

5、reintroducedtocharacterizethedamageextension.Theadhesivelayerwasmodeledwiththeisotropicconstitutive.Asquarecriterionbasedonthreedirectionshearstrainstopredictthestartingoftheadhesivelayer’sdamageandadegradationfunctionassociatedwiththestressandstrainwasdefinedtodegeneratethestiffnessofthedamagedma

6、terial.ThenumericalpredictionwascomparedwiththeII万方数据上海交通大学硕士学位论文experimentalresults,andtheultimateloadcorrelatewell,whichverifiedthemethodandmodelcaneffectivelypredictthetensileultimatestrengthofthedoublesidedrepairedcompositelaminatestructures.KEYWORDS:compositematerial,adhesivelyrepair,analytic

7、almodel,FEMmodel,strengthIII万方数据上海交通大学硕士学位论文目录摘要·································································································IABSTRACT··························································