FRACTUREMECHANICSProceedingsoftheTwelfthNationalSymposiumonFractureMechanicsAsymposiumsponsoredbyASTMCommitteeE-24onFractureTestingofMetalsAMERICANSOCIETYFORTESTINGANDMATERIALSWashingtonUniversitySt.Louis,Mo.,21-23May1979ASTMSPECIALTECHNICALPUBLICATION700P.C.ParisWashingtonUniversitysymposiumchairman04-700000-309>AMERICANSOCIETYFORTESTINGANDMATERIALS1916RaceStreet,Philadelphia,Pa.19103Copyright©byAMERICANSOCIETYFORTESTINGANDMATERIALS1980LibraryofCongressCatalogCardNumber:79-55188NOTETheSocietyisnotresponsible,asabody,forthestatementsandopinionsadvancedinthispublication.PrintedinBaltimore,Md.July1980ForewordThispublication,FractureMechanics,containspaperspresentedattheTwelfthNationalSymposiumonFractureMechanicswhichwasheld21-23May1979atWashingtonUniversity,St.Louis,Missouri.TheAmericanSocietyforTestingandMaterials'CommitteeE-24onFractureTestingofMetalssponsoredthesymposium.P.C.Paris,WashingtonUniversity,pre-sidedassymposiumchairman.RelatedASTMPublicationsPart-ThroughCrackFatigueLifePredictions,STP687(1979),$26.65,04-687000-30FractureMechanicsAppliedtoBrittleMaterials,STP678(1979),$25.00,04-678000-30FractureMechanics,STP677(1979),$60.00,04-677000-30Elastic-PlasticFracture,STP668(1979),$58.75,04-668000-30FractographyinFailureAnalysis,STP645(1978),$36.50,04-645000-30FlawGrowthandFracture,STP631(1977),$49.75,04-631000-30ANoteofAppreciationtoReviewersThispublicationismadepossiblebytheauthorsand,also,theunheraldedeffortsofthereviewers.Thisbodyoftechnicalexpertswhosededication,sacrificeoftimeandeffort,andcollectivewisdominreviewingthepapersmustbeacknowledged.ThequalitylevelofASTMpublicationsisadirectfunctionoftheirrespectedopinions.OnbehalfofASTMweacknowledgewithappreciationtheircontribution.ASTMCommitteeonPublicationsEditorialStaffJaneB.Wheeler,ManagingEditorHelenM.Hoersch,AssociateEditorHelenMahy,AssistantEditorContentsIntroduction1PredictionMethodsforFatigueCracicGrowthinAircraftMaterial—lAAPSCHIJVE3FractographicMeasurementsofCracit-TipClosure—R.M.PELLOUX,M.FARAL,A...
