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1、Mar2017MACHINETOOL&HYDRAULICSHydromechatronicsEngineeringVol45No6Received22August2016;revised15October2016;accepted11November2016Correspondingauthor:JingWangEmail:1065560315@qqcomMACHINETOOL&HYDRAULICSHydromechatronics
2、Engineeringhttp://jdyqkscquteducnEmail:jdygcyw@126comStrengthanalysiswithFEAmethodonrubberdiaphragmaccumulatorJingWANG1,JiangFU2,GuichuanHUANG2,QihuZHANG1,YazhouLI2,GangLEI1(1ChongqingUniversityofTechnology,KeyLabor
3、atoryofAdvancedManufacturingtechnologyforAutomobileParts,MinistryofEducation,Chongqing400054,China)(2ChongqingHongjiangmachinerylimitedliabilitycompany,Chongqing402162,China)Abstract:Rubberdiaphragmfailureisthemainfailur
4、emodeofthediaphragmaccumulatorBasedontheworkingprincipleofdiaphragmchamberofgasaccumulator,theaxisymmetricfiniteelementmodelisestablished,inwhichtherubberdiaphragmmaterialbyOgdenconstitutivemodel,andthegasintheaccumulato
5、rusingthefluidelementinABAQUStosimulateCalculatingthestressdistributionunderthemaximumgaspressurethroughtheimplicitnonlinearfiniteelementanalysis,soastoguidereasonablediaphragmdesignKeywords:Rubberdiaphragm,Parameterfitt
6、ing,FEMdoi:103969/jissn1001-3881201706014Documentcode:ACLCnumber:TH131IntroductionAccumulator[1]isakindofenergysavingdeviceinhydraulicpneumaticsystemWhenitisappropriate,theotherenergyinthesystemcanbeconvertedintocompres
7、sionenergytobestored,whenthesystemneeds,andthenthestoredcompressionenergycanbeconvertedintotheenergyrequiredtoreleaseAccordingtothedifferentloadingmode,itcanbesimplyclassifiedintothreecategories:gas,piston,springGasaccum
8、ulatorcanbedividedintononisolatedtype,airbagtypeanddiaphragmtypeInthispaper,thefiniteelementanalysisiscarriedoutfortheanalysisofthediaphragmaccumulatorinthegastypeBecausetherubberdiaphragm[2]islongtermworkintheperiodi
9、cstressstate,itiseasytoproducethefailure,sothemaindamageformoftheaccumulatoristherubberdestructionThereforeitisnecessarytocarryoutthefiniteelementanalysisoftherubberdiaphragmAccordingtotheworkingprocessofdiaphragmofthed
10、iaphragmaccumulator,asimplifiedaxisymmetricstructurefiniteelementmodelisestablished,andthenonlinearfiniteelementanalysisiscarriedoutbyusingtheABAQUSsolver2StructureandworkingprincipleThemaincomponentsofthediaphragmaccum
11、ulatorcomprisetwohemisphericalshellsandarubberdiaphragmTwohousingsaredividedintoagascavityandtheoilcavitybyanintermediaterubberdiaphragm,andtheroleoftherubberdiaphragmistoseparatetheoilandthegas,theupperandlowercasing
12、s,respectively,areprovidedanintakeholeandanoilinletholeThegeometricmodelisshowninFig1TheaccumulatorisbasedonBoyle’slaw,andtheenergyistransformedbycompressedgas,andtheaccumulatorisfirstfilledwithapredeterminedpressureWhe
13、nthesystemoilpressureexceedstheinternalgaspressureoftheaccumulator,theoilcompressedgascanbeconvertedintothegascompressionWhenthesystemoilpressureislowerthantheinternalgaspres萬(wàn)方數(shù)據(jù)thebulkmodulusIfthetermofthestrainenergyd
14、ensityfunctionisignoredintheexpressionofthestrainenergydensityfunction,theMooneyformulaisacompletesecondarytheoryforsmallstrainItcanbeexplainedthatthedeviationoftheGaussstatisticalmodelandtheexperimentaldatainuniaxialte
15、nsiontest,butthesameistheconstantshearmodulus,cannotbemoreaccuratedescriptionofthemechanicalbehaviorofcarbonblackfillervulcanizedrubberOgdenstrainenergyexpression[4]isasfollows:W=∑ni=12uiα2i(λαi1+λαi2+λαi3-3)+∑ni=11Di(J-
16、1)2i(6)Formula(6):λ,λ2,λ3isthemainelongation,uiforelasticparameters,αifortheconstant,andtomeetuiαi>0,Jforvolumedeformation,DiforvolumeparametersOgdenmodelandtheMooneyRivlinmodelareverysimilar,butintheOgdenmodel,coeffic
17、ientofhyperelasticmaterialnotnecessarilyintegers,andthereisn’taconnectionbetweenthepositiveindexandnegativeindex,allowingunpairedindexButconsideringthestabilityofthemodel,theremustbeuiαi>0UsingEvaluatefunctionofABAQUSt
18、ofitthematerialFinally,theparametersofMooneyRivlinmodelare:C10=1268,C01=-12611,D1=0,andOgdenmodelparametersare:μ1=-8902,α1=105,μ2=4150,α2=1466,μ3=4935,α3=056ThefittedcurvesareshowninFig3belowFig3Fittingcurveofrubberma
19、terialTheredlineistheexperimentaldatacurve,theblueistheconstitutivemodelofthefittedcurveoffirstorderMooneyRivlin,andtheyellowisthecurveofthethreeorderOgdenItshowsthatthefittingaccuracyofthetwoorderandthreeorderishighe
20、r,forbetterfittingcurveandimprovingtheaccuracyandreliabilityofthecalculationresults,threeorderOgdenconstitutivemodelischosen4Animplicitnonlinearfiniteelementanalysisofrubberaccumulator41Finiteelementcalculationprinciple
21、ofcavityInABAQUS,whenthefluidelementisusedtosimulatetheairelement,itisconsideredthatthefluidcanbecompressed,andallfluidcavityisassumedtobeanidealgasTherefore,whenthetemperatureisconstanttemperature,pressureforenvironmen
22、talpressure,inthesolidmodeloffluidelementbyelementF3D4/F3D3andcavitysystemmeetstheconditionsthatisP0Vn0=P1Vn1=P2Vn2Inthetwodimensionalmodel,thefluidelementisFax2(inFig4andFig5)Fig4F3D3elementFig5Fax2elementThechangeofth
23、epressureattheworkingtimeofthecavityelementcausesthechangeofthedistancebetweenthenodesoftheFax2elementtothereferencepoint,whichleadstothedeformation,andtheprincipleisshowninFig6Fax2element(Linearelement)andthecavityrefe
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