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SANDIAREPORTSAND2002-0771UnlimitedReleasePrintedMarch2002FATIGUEOFCOMPOSITEMATERIALSANDSUBSTRUCTURESFORWINDTURBINEBLADESJohnF.Mandall,DanielD.Samborsky,DouglasS.CairnsPreparedbySandiaNationalLaboratoriesAlbuquerque,NewMexico87185andLivermore,California94550SandiaisamultiprogramlaboratoryoperatedbySandiaCorporation,aLockheedMartinCompany,fortheUnitedStatesDepartmentofEnergyunderContractDE-AC04-94AL85000.Approvedforpublicrelease;furtherdisseminationunlimited.IssuedbySandiaNationalLaboratories,operatedfortheUnitedStatesDepartmentofEnergybySandiaCorporation.NOTICE:ThisreportwaspreparedasanaccountofworksponsoredbyanagencyoftheUnitedStatesGovernment.NeithertheUnitedStatesGovernment,noranyagencythereof,noranyoftheiremployees,noranyoftheircontractors,subcontractors,ortheiremployees,makeanywarranty,expressorimplied,orassumeanylegalliabilityorresponsibilityfortheaccuracy,completeness,orusefulnessofanyinformation,apparatus,product,orprocessdisclosed,orrepresentthatitsusewouldnotinfringeprivatelyownedrights.Referencehereintoanyspecificcommercialproduct,process,orservicebytradename,trademark,manufacturer,orotherwise,doesnotnecessarilyconstituteorimplyitsendorsement,recommendation,orfavoringbytheUnitedStatesGovernment,anyagencythereof,oranyoftheircontractorsorsubcontractors.TheviewsandopinionsexpressedhereindonotnecessarilystateorreflectthoseoftheUnitedStatesGovernment,anyagencythereof,oranyoftheircontractors.PrintedintheUnitedStatesofAmerica.Thisreporthasbeenreproduceddirectlyfromthebestavailablecopy.AvailabletoDOEandDOEcontractorsfromU.S.DepartmentofEnergyOfficeofScientificandTechnicalInformationP.O.Box62OakRidge,TN37831Telephone:[phone]Facsimile:[phone]E-Mail:[e-mail]::[phone]Facsimile:[phone]E-Mail:[e-mail]:@coe.montana.edu.MilesBuechler,anundergraduatestudent,alsocontributedsignificantlyItoseveralsections.'rlIII1II11:IIIImTableofContentsAbstract...................................................................3Acknowledgements..........................................................4Tableofcontents...........................................................5ListofTables..............................................................10ListofFigures.............................................................13ExecutiveSummary.........................................................211.Introduction.........................................................302.Background.........................................................32PARTA:MATERIALSSTUDIES.............................................393.SelectionofResinMatrixforEnvironmentalResistanceandStructuralIntegrity......393.1.Summary.......................................................393.2.Introduction.....................................................393.3.ExperimentalMethods.............................................403.4.ResultsandDiscussion................................