Influence of Laser Reconditioning on Fatigue Pr....pdf

《Influence of Laser Reconditioning on Fatigue Pr....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、Availableonlineatwww.sciencedirect.comPhysicsProcedia12(2011)512–518LiM2011InfluenceofLaserReconditioningonFatiguePropertiesofCrankshaftsHenryKoehler*,KnutPartes,ThomasSeefeld,FrankVollertsenBIAS–BremerInstitutfürangewandteStrahltechnik,KlagenfurterSt

2、r.2,D-28359BremenAbstractExpensivemachinepartsoftenarerepairedbyadditiveprocessestolimitcostsandincreaseproductivity.However,repairingmarinedieselenginecrankshaftsfortheseaimsisnotyetapprovedbytheclassificationsocietiessincetheinfluenceonmechanicalpro

3、pertiescanneitherbepredictednorhasbeeninvestigatedsufficiently.Amethodfortestingtheinfluenceoflasercladdingonfatiguepropertiesofmarinecrankshaftsispresented.Testsonflatspecimenindicatedadropinfatiguestrengthinconsequenceoflasercladding.Thenumberofbear

4、ableloadcyclesofcladdedcrankshaftsegmentsat100%fatiguestrengthcalculatedaccordingtoCIMACstandardsdropped.Originsofcrackscouldbetracedbacktocladdedareasaswellastocrankshaftfillets.Keywords:processsensingandcontrolling;surfacetreatment;lasercladding;hig

5、hpowerdiodelasers;marinedieselengines;fatiguestrength1.MotivationTherepairofmachinepartscanbeatimeandcostsavingmethodinmanyapplications.Lasercladdingasareconditioningprocessisalreadyfrequentlyusedforthispurpose.Anoverviewofstateoftheartlasersurfacepro

6、cessingisgivenin[1].Althoughlimitedtoasmallvolume,comparedtoconventionalweldingprocesses,theheatingofthepartsduringprocessingcausesanalteringofthemechanicalproperties.Formechanicallyhighlycriticalcomponentslikemarinecrankshaftsthiscanespeciallyaffectt

7、hefatigueproperties.Astheamountoftheinfluenceoflasercladdingonthefatiguepropertiesofthesescomponentscannotbeestimated,thisprocessisnotapprovedforthisapplication,yet.AnexampleforanapprovaloflasercladdingformarineapplicationsbytheGermanLloydcanbefoundin

8、[2].Afailureanalysisofamarinemainenginecrankshaft,whichcrackedduringoperation,isdescribedin[3].Toidentifyareasonstationarydieselenginecrankshafts,wheredefectshavetobeavoided,asimulationofthedynamicloadinghasbeenmadein[4].Thisarticlepresentsame