Progressive Failure Analysis Methodology for Lamin

March1999NASA/TP-1999-209107ProgressiveFailureAnalysisMethodologyforLaminatedCompositeStructuresDavidW.SleightLangleyResearchCenter,Hampton,VirginiaTheNASASTIProgramOffice...inProfileSinceitsfounding,NASAhasbeendedicatedtotheadvancementofaeronauticsandspacescience.TheNASAScientificandTechnicalInformation(STI)ProgramOfficeplaysakeypartinhelpingNASAmaintainthisimportantrole.TheNASASTIProgramOfficeisoperatedbyLangleyResearchCenter,theleadcenterforNASA’sscientificandtechnicalinformation.TheNASASTIProgramOfficeprovidesaccesstotheNASASTIDatabase,thelargestcollectionofaeronauticalandspacescienceSTIintheworld.TheProgramOfficeisalsoNASA’sinstitutionalmechanismfordisseminatingtheresultsofitsresearchanddevelopmentactivities.TheseresultsarepublishedbyNASAintheNASASTIReportSeries,whichincludesthefollowingreporttypes:•TECHNICALPUBLICATION.ReportsofcompletedresearchoramajorsignificantphaseofresearchthatpresenttheresultsofNASAprogramsandincludeextensivedataortheoreticalanalysis.Includescompilationsofsignificantscientificandtechnicaldataandinformationdeemedtobeofcontinuingreferencevalue.NASAcounterpartofpeer-reviewedformalprofessionalpapers,buthavinglessstringentlimitationsonmanuscriptlengthandextentofgraphicpresentations.•TECHNICALMEMORANDUM.Scientificandtechnicalfindingsthatarepreliminaryorofspecializedinterest,e.g.,quickreleasereports,workingpapers,andbibliographiesthatcontainminimalannotation.Doesnotcontainextensiveanalysis.•CONTRACTORREPORT.ScientificandtechnicalfindingsbyNASA-sponsoredcontractorsandgrantees.•CONFERENCEPUBLICATION.Collectedpapersfromscientificandtechnicalconferences,symposia,seminars,orothermeetingssponsoredorco-sponsoredbyNASA.•SPECIALPUBLICATION.Scientific,technical,orhistoricalinformationfromNASAprograms,projects,andmissions,oftenconcernedwithsubjectshavingsubstantialpublicinterest.•TECHNICALTRANSLATION.English-languagetranslationsofforeignscientificandtechnicalmaterialpertinenttoNASA’smission.SpecializedservicesthatcomplementtheSTIProgramOffice’sdiverseofferingsincludecreatingcustomthesauri,buildingcustomizeddatabases,organizingandpublishingresearchresults...evenprovidingvideos.FormoreinformationabouttheNASASTIProgramOffice,seethefollowing:•AccesstheNASASTIProgramHomePageat•[e-mail]•FaxyourquestiontotheNASASTIHelpDeskat(301)621-0134•PhonetheNASASTIHelpDeskat(301)621-0390•Writeto:NASASTIHelpDeskNASACenterforAeroSpaceInformation7121StandardDriveHanover,MD21076-1320NationalAeronauticsandSpaceAdministrationLangleyResearchCenterHampton,Virginia23681-2199March1999NASA/TP-1999-209107ProgressiveFailureAnalysisMethodologyforLaminatedCompositeStructuresDavidW.SleightLangleyResearchCenter,Hampton,VirginiaAvailablefrom:NASACenterforAeroSpaceInformation(CASI)NationalTechnicalInformationService(NTIS)7121StandardDrive5285PortRoyalRoadHanover,MD21076-1320Springfield,VA22161-2171(301)621-0390(703)605-6000AcknowledgmentsTheauthorwouldliketothankhisresearchadvisorDr.NormanF.Knight,Jr.,whosesupport,guidance,understanding,andknowledgehavemadethisworkpossible.AspecialthanksisalsoexpressedtoDr.JohnWangforservingonmythesiscommitteeandbeingamentorformyprofessionaldevelopment.TheauthorwouldalsoliketothankMs.TinaLottsforthecountlesstimesshehashelpedmewithCOMET.iTABLEOFCONTENTSTABLEOFCONTENTS..........................................................................................................................iLISTOFTABLES.................................................................................................................................iiiLISTOFFIGURES................................................................................................................................ivINTRODUCTION...................................................................................................................................1OverviewofProgressiveFailure........................................................................................................1NonlinearAnalysis......................................................................................................................3Strain/StressRecovery................................................................................................................4FailureAnalysis..........................................................................................................................4MaterialDegradation...................................................................................................................7Re-establishmentofEquilibrium.......................................................................................................9LiteratureReviewonProgressiveFailure..........................................................................................9ObjectivesandScope......................................................................................................................12PROGRESSIVEFAILUREMETHODOLOGY.............................................