带裂纹自增强设备的疲劳寿命估算

184199611JournalofSouthwestPetroleumInstituteVol.18No.4Nov1996(),Newman-Raju,,100%;;;;TE09,,,,,,,,,,,,(),,,,,1,Paris,,19950918©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1),,,,[2][3],KI1111NewmanRaju[4]2,NewmanRaju:KI=(St+HSb)a/gF(at,ac,cb,)(1):St,Sb,F,[4]NewmanRaju,,(1),St+HSbPi+RRPi,Ra,,R=0(2),[5][6],,KI:Mg=(1.0+0.122+01963220.3783+0.4234)1/4(2):2=…armt…a=aQ1FQQ=q-0.212(/s)2Q1=1.0-0.1768(/s)2m=ri+ro2,,s,riro(3),Q(1)q,KI::KI=(St+HSb+Pi+R)a/QMgF(3):KI=(St2HSb+Pi+R)a/QMgF(4)471996©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[8-9],,,:KI=M1M2M3a/Q(+Pi+R)(R0)M1M2M3a/Q(+Pi)(R0)(5)[8][9]M1M2M3,[2],F(=M1M2)SchmittKeim[10]:F=1.1+5.20.55(a/b)at(1.8+a/c)(6)M3(2),(5):KI=FMga/Q(+Pi+R)(R0)FMga/Q(+Pi)(R0)(7),,,,,,(3)(4)(7),,,:KI=FMga/Q(+Pi+R)(R0,R=0)(8)F[4](6),Mg(2)3210%25%51.8%81.4%100%Newman-Raju715511337295454718849036Schmitt-Keim6845112002994647992498023,,ri=21mm,ro=47.5mm,K=2.262,a=0.5mm,c=5mm,43CrNi2MVA,[11],[12]Pi=180MPa,,1(8)R,(8),,[13],574:©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=21mm,K=2.262,0.5mm,Pi=180MPa,50%4,100%7,100%3.2,:KI=FMga/Q(+Pi+R)(R0R=0)FNewmanRajuSchmittKeim,SchmittKeimNewmanRaju,SchmittKeim,KI,NewmanRajuKI,,3.3Ra,,,,,111,198421KI1,1985,21(3):1-173,11,1984.1:39-554Newman,Raju1AnEmpricalstress-intensityfactorEquationforthesurfacecrac1Eng.Fract.Mech.1981,15(1-2):185-19251K1,1983.10:26-316,11,1987,4(4):24-317,111984811,1986,15(7):9-11911,1988.1210W.Schmitt,E.Keim1Linearelasticanlysisofsemi-ellipticalaxialsurfacecracksinahollowcylinder,Int.J.Pres.Ves.&Piping,197911,11,1992,14():32-3812,11,1995,23(4):25-3013,11,1996,25(3):7-12671996©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(4):6266Inviewofthefactthatthegasofthestrippedwellshasnotbeendeveloped,thispaperpresentsapreliminaryfeasibilityplanofitsdevelopmentandutilizationbyadoptingthetechniquesofsoliddesulfurizingagent(SDA),pressureswingabsorption(PSA),absorptionnaturalgas(ANG)andnaturalgasvehicle(NGV).Throughanalysis,evaluationandcomparison,itisconsideredpracticalandfeasibletostoreandtransportthegasinsteelcylindersafteritispurgedandabsorbedbyaskid-mountedgaspurificationplant.Thegascanbeusedfuelforvehiclesandindailylife,andasafuelofvehicles,ithasgreatbenefiitsineconomy,society,andenvironmentalprotection.Keywords:Stippedwell;Naturalgas;DevelopmentplanTangXiaodong(Dept.ofChemicalEngineering,SWPI,Sichuan,637001)PreciseCalculationandAnalysisofWorkingAnglesofPDCCutters,JSWPI,1996,18(4):6772AccordingtothecharacteristicsofPDCbitcuttingprocessandtherelevantmetalcuttingtheory,thispapergivesapercisedefinitionofworkingangles,i.e.actualbackrakeandactualsiderakeofPDCcutter,derivestheiraccuratecalculationformulas,andanalyzesthelawoftheeffectsofstructuralparametersonthem,whichisofgreatimportancetothedesign,cuttingforcecalculationandperformanceperdictionofPDCbits.Keywords:Bitteeth;Dipcountion;AnalysisLiShusheng(UniversityofPetroleum,Beijing)EstimationoftheFatigueLifeofAutofrettagedEquipmentwithCracks,JSWPI,1996,18(4):7376Thispaperanalyzestheexpressionofstressintensityfactorofthick-walledcylinderwithcracks,andpointsoutthatNewman-Rajupssolutionoffree-surfaceinfluencecoefficientsistheoptimumexpressionofcalculatingthelifeoffatiquecrackpropagationofthick-walledcylinder.Atthesametime,thispaperindicatesthatthelifeoffatiquecrackpropagationcanbegreatlyincreasedbyautofrettage,andthelongestlifewillbegotwhentheequipmentisautofrettagedby100%overstraindegree.Keywords:Fatiquecrackpropagation;Stressintensityfactor;ResidualstressTaoChunda(Dept.ofMechanicalEngineering,SWPI,Sichuan,637001)PredictionofCasingDamagethroughSequentialFussySyntheticEvaluation,JSWPI,1996,18(4):7780Itisverydifficulttodiagnosethedownholeconditionandpredictthecasingfailureordamage,whichiscausedbysuchfactorsasunclearcircumstancesaroundthewellhole,unknownloadstocasing,complicatedfailuremechanism,fuzzinessofmanyfactors,fuzzyrelationbetweencauseandeffectofcasingdamdge,etc.Onthebasisofanalysisofthesefactors,thispaperestablishesamodeltodealwiththefuzzyrelation,andpresentsanewmethodsequentialfuzzysytheticevaluation(SFSE),whichcanpredictthedown-holeconditionaccordingtothegivendataofthewellandthefield.Thismethodprovidesanewwayforthepredictionoftheservice-lifeofdownholecasing.Keywords:Casingfailure;Life;Prediction;Fuzzyanalysis;EvaluationZhangXiaoyu(Dept.ofMechanicalEngineering,SWPI,Sichuan,637001)321No.4Abstract©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.