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1、Liuetal./JZhejiangUnivSciA20089(7):900-906900JournalofZhejiangUniversitySCIENCEAISSN1673-565X(Print);ISSN1862-1775(Online)www.zju.edu.cn/jzus;www.springerlink.comE-mail:jzus@zju.edu.cn*CalculationsofplasticcollapseloadofpressurevesselusingFEA††‡Peng-feiLIU,Jin-yangZHENG,LiMA,Cun-jianM
2、IAO,Lin-linWU(InstituteofChemicalMachineryandProcessEquipment,ZhejiangUniversity,Hangzhou310027,China)†E-mail:pfliu1980@yahoo.com;jyzh@zju.edu.cnReceivedJan.9,2008;revisionacceptedApr.2,2008Abstract:Thispaperproposesatheoreticalmethodusingfiniteelementanalysis(FEA)tocalculatetheplasti
3、ccollapseloadsofpressurevesselsunderinternalpressure,andcomparestheanalyticalmethodsaccordingtothreecriteriastatedintheASMEBoilerPressureVesselCode.First,afiniteelementtechniqueusingthearc-lengthalgorithmandtherestartanalysisisdevelopedtoconducttheplasticcollapseanalysisofvessels,whic
4、hincludesthematerialandgeometrynon-linearpropertiesofvessels.Second,asthemechanicalpropertiesofvesselsareassumedtobeelastic-perfectlyplastic,thelimitloadanalysisisperformedbyem-ployingtheNewton-Raphsonalgorithm,whilethelimitpressureofvesselsisobtainedbythetwice-elastic-slopemethodandt
5、hetangentintersectionmethodrespectivelytoavoidexcessivedeformation.Finally,theelasticstressanalysisunderworkingpressureisconductedandthestressstrengthofvesselsischeckedbysortingthestressresults.Theresultsarecomparedwiththoseobtainedbyexperimentsandotherexistingmodels.Thisworkprovidesa
6、referencefortheselectionofthefailurecriteriaandthecalculationoftheplasticcollapseload.Keywords:Plasticcollapseload,Pressurevessel,Finiteelementanalysis(FEA),Designbyanalysis(DBA)doi:10.1631/jzus.A0820023Documentcode:ACLCnumber:TH12INTRODUCTIONstressanalysiscriterion.Intheelasticstress
7、analysis,thecalculatedstressesareclassifiedintotheprimary,Theobjectiveofpressurevesseldesignbysecondaryandpeakstresses,whicharealllimitedbyanalysis(DBA)istopreventvariouspossiblefailuresintroducingtheallowablevalues.Thelimitloadandtoensuresafeoperationofvessels.Thisisprac-analysisassu
8、mesth
