FRACTUREMECHANICSProceedingsoftheEleventhNationalSymposiumonFractureMechanics:PartIAsymposiumsponsoredbyASTMCommitteeE-24onFractureTestingofMetalsAMERICANSOCIETYFORTESTINGANDMATERIALSVirginiaPolytechnicInstituteandStateUniversityBlacksburg,Va.,12-14June1978ASTMSPECIALTECHNICALPUBLICATION677C.W.Smith,VirginiaPolytechnicInstituteandStateUniversity,editorListprice$60.0004-677000-30#(AMERICANSOCIETYFORTESTINGANDMATERIALS1916RaceStreet,Philadelphia,Pa.19103Copyright©AMERICANSOCIETYFORTESTINGANDMATERIALS1979LibraryofCongressCatalogCardNumber:78-74567NOTETheSocietyisnotresponsible,asabody,forthestatementsandopinionsadvancedinthispublication.PrintedinBaltimore,Md.August1979ForewordThispublication,FractureMechanics,containspaperspresentedattheEleventhNationalSymposiumonFractureMechanicswhichwasheld12-14June1978atVirginiaPolytechnicInstituteandStateUniversity,Blacksburg,Va.TheAmericanSocietyforTestingandMaterials'Com-mitteeE-24onFractureTestingofMetalssponsoredthesymposium.C.W.Smith,VirginiaPolytechnicInstituteandStateUniversity,servedaseditorofthispublication.Theproceedingshavebeendividedintotwovolumes:Part\—fractureMechanicsandPartII—FractureMechanicsAppliedtoBrittleMaterials.RelatedASTMPublicationsDevelopmentsinFractureMechanicsTestMethodsStandardization,STP632(1977),$24.75,04-632000-30Fractography—MicroscopicCrackingProcess,STP600(1976),$27.50,04-600000-30MechanicsofCrackGrowth,STP590(1976),$45.25,04-590000-30ANoteofAppreciationtoReviewersThispublicationismadepossiblebytheauthorsand,also,theunheraldedeffortsofthereviewers.Thisbodyoftechnicalexpertswhosededication,sacrificeoftimeandeffort,andcollectivewisdominreview-ingthepapersmustbeacknowledged.ThequalitylevelofASTMpublicationsisadirectfunctionoftheirrespectedopinions.OnbehalfofASTMweacknowledgewithappreciationtheircontribution.ASTMCommitteeonPublicationsEditorialStaffJaneB.Wheeler,ManagingEditorHelenM.Hoersch,AssociateEditorEllenJ.McGlinchey,SeniorAssistantEditorHelenMahy,AssistantEditorContentsIntroductionIFATIG...
