Fretting fatigue behavior of Ti–6Al–4V under seawater environment外文学习资料.pdf

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1、MaterialsScienceandEngineeringA403(2005)281289FrettingfatiguebehaviorofTi6Al4Vunderseawaterenvironment
LewisC.Lietch,HyukjaeLee,ShankarMall∗DepartmentofAeronauticsandAstronautics,AirForceInstituteofTechnology(AFIT/ENY),2950P.St.Bldg.640,Wright-PattersonAFB,OH45433-7765,USA

2、Accepted10May2005AbstractFrettingfatiguebehavioroftitaniumalloy,Ti6Al4V,wasinvestigatedinambientlaboratoryandunderacontrolledenvironmentconsistingofsyntheticseawater.Testswereperformedoverawiderangeofthemaximumaxialstressesrangingfrom380to760MPatoexaminebothlowandhighcycle

3、fatigueregimes.Itwasfoundthatseawaterhadadeleteriouseffectonfrettingfatiguelifeinthelowcyclefatigueregimebutimprovedthelifeinthehighcyclefatigueregime.Thenormalizedtangentialforceshowednegligibledifferencebetweenthetwoconditions.Moredebriswasfoundonthefracturesurfaceofspec

4、imensexposedtoseawater,whichalsoresultedinlargerfrettingscarvolumeascomparedtospecimenstestedundertheambientlaboratorycondition.Analysisoftestsshowedthatbotheffectivestressandacriticalplane-basedmulti-axialfatigueparametercouldbeusedtopredictseawaterfrettingfatiguelifefrom

5、theambientlaboratoryfrettingfatiguelifedatainthehighcyclefatigueregime.©2005ElsevierB.V.Allrightsreserved.Keywords:Frettingfatigue;Titaniumalloy;Corrosion;Fatigueparameters1.Introductionasforgedwingstructuresandlandinggearcomponents.Ti6Al4Visthemostcommonlyusedtitaniumallo

6、ywithinFrettingisthesurfacedamagethatoccurswhencontact-theaerospaceindustryasitexhibitsanexcellentstrengthingsurfacesbetweenmatingbodiesexperienceanoscillatorytoweightratio,highoperationaltemperature,andcorrosionmotionofsmallamplitude.Whenfrettingoccursundercyclicresistant

7、propertiesduetotheprotectivenatureofthesur-loadingconditions,theprocessistermedfrettingfatigue.faceoxidefilm[2].AlthoughmanystudieshavefocusedonFrettingfatigueincreasesthetensileandshearstressesatthethefrettingfatiguebehaviorofTi6Al4Vunderambientcontactsurfaceproducingsurfa

8、cedefectswhichcanactaslaboratorycondition[35],fewstudieshavebeenconductedstressconcentrat