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1、SustainableConstructionandDesign2011FAILUREBEHAVIOUROFPRELOADEDAPILINEPIPETHREADEDCONNECTIONSJ.Seys,K.Roeygens,J.VanWittenberghe,T.Galle,P.DeBaetsandW.DeWaeleGhentUniversity,LaboratorySoete,BelgiumAbstract–Thispaperreportsonnumericalandexperimentalworkconcerningthefatiguebehaviouran
2、dsealingcapacityofthreadedpipeconnections(1”APILinePipe).Numericalsimulationsareperformed®©usingAbaqusincombinationwithThreadGen.Thefatiguelifeofathick-walledstandardcouplingisdeterminedusingafour-pointbendingtest.ThecorrespondingS-Ncurveiscomparedtoresultsofpreviousworkonthin-walle
3、dspecimens.Itcanbeconcludedthatthestandardthick-walledconnectionhasahigherfatiguelifethanthin-walledones.Infuturework,thepredictionoffatiguelifeusingestablishedmulti-axialcriteriawillbeevaluated.Further,thesealingcapacityofseveralcouplingswillbeinvestigatedbysubmittingthemtodifferen
4、tcombinationsofinternalpressureandaxialforce.Hereto,aspecifictestsetupisdesigned.Theresultswillthenbepresentedasatestloadenvelope[1].Keywords–Threadedconnections,API,fatigue,four-pointbending,sealinglimit,testloadenvelope,finiteelementanalysis1INTRODUCTIONThreadedpipecouplingsforjoi
5、ningtubularpipeshavebeenusedextensivelyinapplicationssuchasdownholecasing,drillpipestringsandTLPtendons.AnAPIlinepipeconnectionconsistsofamalemember,alsoknownasthepin,whichismadeupintoafemalepart,alsoknownasthebox.Theyhavetheadvantagethattheycanbeeasilycoupledanduncoupled.Inoffshore
6、applications,connectionscanbesubjectedtocyclicloads,e.g.whendrillingdeviatedwellsorduetomovementofoilplatforms.Incaseofrisersanddrillpipes,fatigueisoneofthemostimportantfailuremodes.Sincethehigheststressconcentrationoccursattherootofthelastengagedthread(LET,Figure1)ofthepin,fatiguec
7、rackscommonlyinitiateatthislocation.However,thefundamentalknowledgeontheactualcrackinitiationandpropagationisstillinadequate.Tothatpurpose,studiesofthefracturesurface,basedonthebeachmarkingtechnique,willbecarriedout.Apartfromfatigue,thethreadsealingperformanceofthin-andthick-walledc
8、onnectionswillalsob
