Comparative Study of Corrosion–Fatigue in Aircraft Materials.pdf

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1、http://www.paper.edu.cnAIAAJOURNALVol.39,No.2,February2001ComparativeStudyofCorrosion–FatigueinAircraftMaterialsQ.Y.Wang,¤R.M.Pidaparti,†andM.J.Palakal‡IndianaUniversity–PurdueUniversityatIndianapolis,Indianapolis,Indiana46202Corrosion–fatigueisoneofthedamagemechanismsaffectingthestructur

2、alintegrityoftheagingaircraft.Simpleanalyticalandprobabilisticmodelsforpredictingpittingcorrosionandcorrosion–fatiguelifeinaluminumalloy2024/T3usedinaircraftstructuresispresented.Thedevelopedmodelincludestheeffectoftheinteractionofcyclicloadandthecorrosiveenvironmentonthefatiguelife,andco

3、nsidersallstagesofthecorrosion–fatigueprocess.Theprobabilisticmodelinvestigatedconsiderstheuncertaintiesininitialpitsize,corrosionpittingcurrent,andmaterialpropertiesduetoscatterfoundintheexperimentaldata.Theanalyticalmodelshowsverygoodquantitativeagreementwiththeexistingexperimentaldataa

4、ndanalyticalmodelsoverawiderangeofparameters.Theresultspredictedthatthecrackinitiationlifevariesapproximately10–40%ascomparedtocrackpropagationlifeincorrosion–fatigueproblems.I.Introductiononsetofcrackgrowth.Inaseriesofpapers,Weietal.4andHarlowandWei5¡7havedevelopedaprobabilisticmodelfort

5、hepredictionATIGUEfailuresmayresultwhenagingaircraftareoperatedinFacorrosiveenvironmentduetonucleation,initiation,andprop-ofcorrosionandcorrosion–fatiguelife.Theirmodelisbasedonagationofcracksatthecorrosionpitsinaircraftmaterials.Scheduledthegrowthofasingledominantawfromapittoasmallsurfac

6、emaintenanceandinspectionofaircraftcomponentsinadvancemaycrackandthenintoathroughcrack.Theyshowedthatprobabilisticpreventsuchfailures.Establishmentofsimpleanalyticalmodelsconceptscouldbeemployedtopredictthepittingcorrosion–fatigueforcorrosion–fatigueishelpfulindesigningamaintenancepro-pro

7、cess.However,intheirmodel,fatiguecracknucleationwasnotconsidered.Rokhlinetal.8developedafracturemechanicsmodelgrambasedontheresiduallifetoavoidfailure.ItiswellknownthatcorrosionpittinghasastrongeffectonfatiguelifeofAlalloysusedforfatiguecrackinitiationandpropagation