基于高分辨率CT成像的疲劳裂纹扩展行为研究.pdf

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TheResearchontheFatiguecrackPropagationbehaviorbasedonTheHigh-ResolutionCTimagingADissertationSubmittedfortheDegreeo

2、fMasteronInstrumentandMeterEngineeringbyLuPengUndertheSupervisionofAssociateProf.AoBoSchoolofTestingandOpto-ElectronicEngineeringNanchangHangkongUniversity,Nanchang,ChinaJune,2015<=2A50]^_`abcd

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15、∆IAbstract2A50wroughtaluminumalloygetsalargenumberofapplicationsintheaerospaceindustrybecauseofitsgoodplasticityandhighstrengthcharacteris

16、tics.Thestructuresoftheaircrafttendtoproducefatiguecracksunderthebendingloadsandwillthreatenthesafetyduringtheflight.Determiningthecrackinformationistheprerequisiteforthecrackpropagationanalysis,andthecrackpropagationhastypicalthree-dimensionalcharacteristics,whileth

17、econventionalnon-destructivetestingmethodscan’tobtainthree-dimensionalinformationofcracks.Therefore,inthispaper,2A50wroughtaluminummaterialwasselectedastheobjectofthestudy,andthehigh-resolutionCTimagingmethodwasusedtodotheresearchonthree-dimensionalcrackpropagationbe

18、haviorsanddamagecharacterizationunderbendingload.Obtainingthespecimenswithcracksofdifferentstagesofthecrackpropagationbythree-point