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1、FailureAnalysisofAdhesivelyBondedCompositeJoints?§**PhilYarrington,JamesZhangandCraigCollierCollierResearchCorp.,Hampton,VA23669??BrettA.BednarcykUniversityofVirginia,Charlottesville,VA22903Failureanalysisofbondedcompositejointsisessentialtothedesignofmodernaerospacevehiclesinwh
2、ichadhesivejointsarewidelyused.Recently,methodsforstressandfailureanalysisofcompositebondedjointshavebeendevelopedinanewHyperSizer?capability.Thefirstpartofthecapabilityinvolvescalculationofadhesivestresses,aswellasdetailedin-planeandout-of-planestressesintheadherends,asdescribe
3、dinref.1.Thiscompanionpaperpresentsthesecondmajorpart,whichisthepredictionoffailureofbondedjointsandvalidationofthosepredictions.Manyleadingbondedjointfailuretheories,summarizedherein,wereimplemented,andthenevaluatedforaccuracyagainsttestdata.Throughcomparisonto14testcaseswith3d
4、ifferentjointconfigurations,theratiosofpredictedfailureloaddividedbytestaveragefailureloadvaryfrom0.77to0.95.TheseresultsshowthatHyperSizerisrelativelyaccurateandconsistentforpredictinginitialfailure.I.Introductionethodsforstressandfailureanalysisofcompositebondedjointshavebeend
5、evelopedrecentlyandMimplementedinanewHyperSizer?capability1.ThecapabilityofHyperSizertocalculateaccuratethree-dimensionalstressesenablespredictionoffailureloadsinbondedcompositejointswithcomplex3Dstressstates.Failurepredictionrequiresnotonlyaccuratestressanalysis,butalsouseofapp
6、ropriatefailurecriteriaassociatedwithspecificfailuremodes.Forbondedjoints,thefailureoccurseitherwithintheadhesive(cohesivefailure),attheadhesive/adherendinterface(interfacefailure),orintheadherends.Metallicadherendsgenerallyfailinrelativelysimplemodescomparedtocompositeadherends
7、,whichmayfailinmatrixtension/compression,fibertension/compression,delamination,etc.Interfacialfailureisparticularlycomplexbecauseoftheformationofchemicalbonds,whosestrengthsaredifficulttomeasure.Insomecases,compositejointsfailprogressivelyafterdamageisinitiatedintheadherendsorin
8、theadhesive.Theultimatefailureofajointwillthenn
