结构断裂分析的williams单元与其工程应用

《结构断裂分析的williams单元与其工程应用》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、WILLIAMSELEMENTANDITSENGINEERINGAPPLICATIoNGSFoRSTRUCTURALFRACTUREANALYSISABSTRACTMoststructuresarecontainingcracksordefectsinengineeringpractice，applicationoftraditionalstrengththeoryisnolongersufficienttoanalyzethetypeoftheseproblems，itisnecessarytointroducethefractu

2、remechanicstheorytotheanalysisofthestructurewithcracks．Theprimarytaskoflinearelasticfracturemechanicsanalysisistosolvethestressintensityfactogusingtraditionalfiniteelementorsingularelementcalculationofstressintensityfactorneedlargeamountofcalculationandcannotdirectlyob

3、tainSIF．Basedonthese，WilliamselementaboutthemodeIIIandI-IImixedmodecrackproblemshasbeenestablishedandappliedtosolvepracticalengineeringproblems，thestressintensityfactorcanbeobtaineddirectlybythecorrespondingundeterminedparametersinthemodelofWilliamselementThemainresear

4、chWOrkandcontributionofthisthesisareasshowbelow1．Basedonthe1inearelasticfracturemechanicsandfiniteelementmethodofthegeneralizedcoefficients，Williamselementonthestructuralfractureanalysishasbeenestablished，throughtheprogrammingofFortran90proceduretoanalyzedandcalculated

5、themodeIIIandI-IImixedmodecrackproblems，theinfluenceofthethreeimportantparametersonthestressintensityfactorcalcualationaccuracyismainlydiscussed，andtheirrecommendedvaluesaregived2．Theplanestrainmodelhasbeenestablishedtosimulatethesemi—rigidasphaltpavement，stressintensi

6、tyfactorofreflectivecrackiscalculatedbyWilliamselementmethod．Andthen，theimpactofaspaltpavementmaterialparametersonthestressintensityfactorisanalysed，themeasurestosuppressreflectivecrackfurtherexpansionisproposedfinally3．Williamselementisintroducedintotheanalysisofthety

7、peIIIfractureprobleminpiezoelectricmaterials，therelationshipbetweensectiongeometryandstressintensityfactorisdiscussedKEYWORDS：Williamselement；Linearelasticfracturemechanics；Finiteelementwithgeneralizedcoefficients；Stressintensifyfactor；Reflectivecrack；Piezoelectricmate

8、rialsIII目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ABSTRACT⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯1．1引言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．⋯．1．2断裂