Acoustic emission wave propagation in a viscoelastic plate

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1、CompositesScienceandTechnology59(1999)1735±1743AcousticemissionwavepropagationinaviscoelasticplateM.Giordanoa,L.Condellib,L.Nicolaisb,*aInstitutefortheCompositeMaterialsTechnology,NationalResearchCouncil,P.leTecchio80125Naples,ItalybDepartmentofMaterialsandProductionEnginee

2、ring,UniversityofNaples``FedericoII'',P.leTecchio80125Naples,ItalyReceived13October1998;receivedinrevisedform20January1999;accepted5February1999AbstractInloadedmaterialsthestrain-energyreleaseduetomicrostructuralchangesresultsinstress-wavepropagation.Acousticemissiondealswi

3、ththerecognitionofsuchwavesoverthematerialsurfacesandforthisreasontheapplicationofacousticemissiontechni-questothemonitoringofthemechanicalintegrityofmaterialsandstructuresisappropriate.Nevertheless,theuseofsuchtech-niquesinthecaseofpolymer-basedcompositematerialsneedsaclea

4、rerunderstandingoftherelationshipsbetweentherecordedsignal,thedamageprocessandthestructuregeometry.Inthisworkamodelisproposedofthepropagationinaviscoelasticplateofwavesduetoadamageevent.Themicrofailureeventhasbeenrepresentedasapointsourceandraytheoryhasbeenappliedtodevelopt

5、hephysicalmodelofwavepropagation.Thespectralanalysistechniquehasbeenappliedtothesolutionofthewaveequations.Modelcalculationsinthefrequencydomainhavebeencomparedwithexperimentalspectraresultingfrom®berbreak-ageindierent®ber/matrixsystemsfromsingle-®berfragmentationtests.#199

6、9ElsevierScienceLtd.Allrightsreserved.Keywords:A.Polymer-matrixcomposites;C.Damagemechanics;D.Acousticemission;Wavepropagation1.Introductionmechanism,i.e.thefailuremechanism,orthewavepropagationthrougha®nitemedium.AtheoreticalSeveraltypesofmicrofailureeventoccurwhenpoly-mod

7、elneedstoelucidatethein¯uenceofthefailuremercompositestructuresareloaded.Theseinclude®berdynamicsandthepropagationmediumuponthepull-out,®berbreakage,matrixcrackingandinterfacialreceivedacousticsignalfeatures.debonding.ThedamageprocessleadstoadegradationSeveralattemptshavebe

8、enmadeinAEprocessofthemechanicalpropertiesandtocatastrophicfailuremodeling.Startin