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时间:2019-03-14
《Fretting fatigue behavior of Ti–6Al–4V under seawater environment外文学习资料.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、MaterialsScienceandEngineeringA403(2005)281289FrettingfatiguebehaviorofTi6Al4VunderseawaterenvironmentLewisC.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
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