摘要
Cold-stretchedpressurevesselsfromausteniticstainlesssteels(ASS)arewidelyusedforstorageandtransportationofliquefiedgases,andhavesuchadvantagesasthinwallandlightweight.Fatigueisanimportantconcerninthesepressurevessels,whicharesubjectedtoalternativeloads.Eventhoughseveralcodesandstandardshaveguidelinesonthesepressurevessels,therearenorelevantdesignmethodsonfatiguefailure.TounderstandthefatiguepropertiesofASS1.4301(equivalentsincludeUNSS30400andAISI304)insolution-annealed(SA)andcold-stretchedconditions(9%strainlevel)andtheresponseoffatiguepropertiestocoldstretching(CS),low-cyclefatigue(LCF)testswereperformedatroomtemperature,withtotalstrainamplitudesrangingfrom-.4%to-.8%.Martensitetransformationsweremeasuredduringthetests.Comparisonsoncyclicstressresponse,cyclicstress-strainbehavior,andfatiguelifewerecarriedoutbetweenSAandCSmaterials.ResultsshowthatCSreducestheinitialhardeningstage,butprolongsthesofteningperiodinthecyclicstressresponse.Martensitetransformationhelpsformastableregimeandsubsequentsecondaryhardening.Thestressesofmonotonicandcyclicstress-straincurvesareimprovedbyCS,whichleadstoalowerplasticstrainandamuchhigherelasticstrain.ThefatigueresistanceoftheCSmaterialisbetterthanthatoftheSAmaterial,whichisapproximately1?03to2?04cycles.TheS-NcurveoftheASMEstandardforASSiscomparedwiththefatiguedataandisjustifiedtobesuitableforthefatiguedesignofcold-stretchedpressurevessels.However,consideringtheCSmaterialhasabetterfatigueresistance,theS-Ncurvewillbemoreconservative.ThepresentstudywouldbehelpfulinmakingfulluseoftheadvantagesofCStodevelopanewS-Ncurveforfatiguedesignofcold-stretchedpressurevessels.
出版日期
2013年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
