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ID:40631952
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页数:7页
时间:2019-08-05
《Fatigue crack propagation monitoring by Acoustic Emission signal analysis》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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、influenceonsafetyassessmentFRPofthesestructures.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
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