資源描述：
《Fatigue crack propagation monitoring by Acoustic Emission signal analysis》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在學術(shù)論文-天天文庫。
1、EngineeringFractureMechanics81(2012)26–32ContentslistsavailableatSciVerseScienceDirectEngineeringFractureMechanicsjournalhomepage:www.elsevier.com/locate/engfracmechFatiguecrackpropagationmonitoringbyAcousticEmissionsignalanalysisP.Antonaci,P.Bocca,D.Masera?Depar
2、tmentofStructuralandGeotechnicalEngineering,PolitecnicodiTorino,CorsoDucadegliAbruzzi24,10129Turin,ItalyarticleinfoabstractKeywords:Acrucialaspectindamageevaluationofmasonrystructuresistheanalysisoflong-termMasonrybehaviourandforthisreasonfatigueanalysishasagreat
3、in?uenceonsafetyassessmentFRPofthesestructures.FatigueAcousticEmission(AE)techniqueisveryeffectiveinidentifyingmicroandmacro-defectsCrackpropagationandtheirtemporalevolutionduetofatigueinseveralmaterials.ThistechniquepermitstoAcousticEmissionestimatethevelocityof
4、ultrasonicwavespropagationandtheamountofenergyreleasedSignalprocessingduringfracturepropagationtoobtaininformationonthecriticalityoftheongoingprocess.BymeansofAEmonitoring,anexperimentalanalysisontwodifferentsetsofreinforcedmasonrywallsunderfatigueloadinghasbeenc
5、arriedout.Duringthesetests,theAEsig-nalswererecorded.TheAEsignalswereanalysedusingFastFourierTransform(FFT)toexaminethefrequencydistributionduringthemicro-andmacro-crackingprocess.TheevolutionofthewavelengthoftheshearcomponentoftheAEsignalwasevaluatedthroughthetw
6、ocharacteristicpeaksintheAEsignalsspectrumandthewavespeedofthePorSwaves.Thiswavelengthevolutioncanprovideinformationonthemicro-crackandmacro-crackprogress.Thisprocedurepermitstoestimatethecharacteristicfracturedimensioninseveralloadingconditionsandfordifferentmas
7、onryreinforcingmethods.ó2011ElsevierLtd.Allrightsreserved.1.IntroductionFromatechnologicalpointofview,sofar,thestrengtheningofmasonrystructureshasbeenaccomplishedadoptingstan-dardmaterials,mainlyreinforcedconcreteandcement-basedorcement-freemortars,sometimesinduc
8、ingachangeinthestaticbehaviourofthestructures.Amongtheseinterventions,oneofthemostcommonistoprovidesingle-ordouble-sidedstructuralmortarlayers.Thistechniqueisc
