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基于API579准则对弯管腐蚀数值模拟的分析.docx

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基于API579准则对弯管腐蚀数值模拟的分析 Abstract Corrosionisacommonprobleminpipelines,especiallyinbendingsections,whichleadstoadecreaseinthestrengthandservicelifeofpipelines.Inthispaper,thecorrosionbehaviorinabendingpipeissimulatedbasedonAPI579code.Firstly,thegeometricpropertiesofthebendingpipearemodeledandmeshedusingengineeringsoftware.Secondly,thecorrosiondepthandcorrosionratearedeterminedaccordingtotheinspectiondataofthepipeline.Thirdly,thestressstateofthebendingpipeisanalyzed,andtheeffectofcorrosiononthestructuralperformanceisevaluated.Finally,theremainingstrengthofthebendingpipeispredicted,andthesafetyofthepipelineisassessed. Introduction Pipelinesarewidelyusedfortransportingoil,gas,andotherfluidsinvariousindustries,suchaspetroleum,chemical,andnaturalgas.Pipelinefailuremayleadtoseriousconsequences,includingenvironmentalpollution,personnelinjury,andeconomicloss.Corrosionisoneofthemajorproblemsthataffectthesafetyandintegrityofpipelines.Corrosioninpipelinescanbecausedbyvariousfactors,suchasthecorrosivenessofthefluid,theoperatingconditions,thematerialproperties,andthedesignfeatures. Bendingsectionsofpipelinesareparticularlyvulnerabletocorrosion,asthelocalstressesandstrainsaremuchhigherthaninstraightsections.Thecorrosionmayalsooccurinthewelds,whicharetheweakpointsofthepipeline.Therefore,itisimportanttoassessthecorrosionrateanddepthinbendingsectionsandtoevaluatetheirimpactonthestructuralperformanceofthepipeline. API579isawidelyusedcodeforassessingthefitness-for-serviceofcorrodedpipelines.Itprovidesguidelinesandproceduresforevaluatingthedamagecausedbycorrosion,erosion,andothertypesofdegradation.Inthispaper,weapplyAPI579codetosimulatethecorrosionbehaviorinabendingpipeandtopredicttheremainingstrengthofthepipeline. Methodology Themethodologyforthecorrosionsimulationofthebendingpipeconsistsoffourmainsteps: Step1:Geometricmodelingandmeshing Thegeometricpropertiesofthebendingpipearemodeledusingengineeringsoftware,suchasCADorsolidmodelingsoftware.Thedimensionsandshapeofthepipearespecified,an