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1、ScienceandTechnologyofAdvancedMaterials4(2003)205212www.elsevier.com/locate/stamEvaluationofinsitufracturetoughnessofceramiccoatingsatelevatedtemperaturebyAEinverseanalysisM.Watanabea,1,T.Okabeb,M.Enokia,*,T.KishicaDepartmentofMaterialsScience,SchoolofEngineering,TheUniversityofTokyo,7-3-1Ho
2、ngo,Bunkyo-ku,Tokyo113-8656,JapanbDepartmentofAdvanceEnergy,GraduateSchoolofFrontierScience,TheUniversityofTokyo,4-6-1Komaba,Meguro-ku,Tokyo153-8904,JapancNationalInstituteforMaterialsScience,1-2-1Sengen,Tsukuba,Ibaraki305-0047,JapanReceived20February2003;accepted25February2003AbstractThispa
3、perdescribesacousticemission(AE)measurementatelevatedtemperaturebylasertechniques.AEsignalsoriginatedfrommicrofractureofAl2O3/SUS304plasmasprayedcoatingsweredetectedusingalaserinterferometerduringthermalcycling.TheradiiofmicrocrackswereevaluatedbytheinverseanalysisofAEsignals.Microcrackradii
4、werealsostudiedbythenumericalanalysisbasedonthedelaminationmodelforcoatingmaterialswithvariousfracturetoughnessandaninitialcracksizeatelevatedtemperature.InsitufracturetoughnessformicrocrackingwasevaluatedbycombiningtheresultsofAEinverseanalysiswiththoseofnumericalanalysis.Thisapproach2revea
5、ledthattheinsitutoughnessofthecoatingsis4050J/m,consistentwiththeresultsofadoublecantileverbeamtest.q2003ElsevierScienceLtd.Allrightsreserved.Keywords:Ceramiccoatings;Acousticemission;Laserinterferometer;Microfracture;Insitufracturetoughness1.Introductionisdifficulttoquantitativelyevaluatethe
6、fracturebehaviorandtheinterfacialpropertieswiththermaltreatment.Thermalbarriercoatings(TBCs)havebeendevelopedTherefore,theinsituevaluationmethodforfractureunderthermalcycleenvironmentisrequired.andutilizedtoimprovetheefficiencyofinternalcombustionMeasurementsofacousticemission(AE)signalsusing
7、aenginesandgasturbine.Inthesecoatings,debondingofwave-guideweretriedtoevaluatethetemperatureofceramiccoatingsbecomessevereproblemandtherearefractureincoatings[9,10].Inthismethodrelativelylongcompellingneedstounderstandandevaluatetheinterfacialwave-