外文翻译--三维注射成型流动模拟的研究

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1、附录NumericalFillingSimulationofInjectionMoldingUsingThree—DimensionalModelAbstract：Mostinjectionmoldedpartsarethree-dimensional,withcomplexgeometricalconfigurationsandthick／thinwallsections．A3Dsimulationmodelwillpredictmoreaccuratelythefillingprocessthan

2、a2.5Dmode1.Thispapergivesamathematicalmodelandnumericmethodbasedon3Dmodel，inwhichanequal-ordervelocity-pressureinterpolationmethodisemployedsuccessfully．Therelationbetweenvelocityandpressureisobtainedfromthediscretizedmomentumequationsinordertoderivethe

3、pressureequation．A3Dcontrolvolumeschemeisemployedtotracktheflowfront．Thevalidityofthemodelhasbeentestedthroughtheananalysisoftheflowincavity．Keywords：threedimension；equal-orderinterpolation；simulation；injectionmolding1IntroductionDuringinjectionmolding，

4、thetheologicalresponseofpolymermeltsisgenerallynon-Newtonianandnoisothermalwiththepositionofthemovingflowfront．Becauseoftheseinherentfactors，itisdifficulttoanalyzethefillingprocess．Therefore，simplificationsusuallyareused．Forexample，inmiddle-planetechniq

5、ueanddualdomaintechnique[1],becausethemostinjectionmoldedpartshavethecharacteristicofbeingthinbutgenerallyofcomplexshape，theHele-Shawapproximation[2]isusedwhileananalyzingtheflow,i.e.．Thevariationsofvelocityandpressureinthegapwise(thickness)dimensionare

6、neglected．Sothesetwotechniquesareboth2.5Dmoldfillingmodels，inwhichthefillingofamoldcavitybecomesa2Dprobleminflowdirectionanda1Dprobleminthicknessdirection．However,becauseoftheuseoftheHele-Shawapproximation，theinformationthat2.5Dmodelscangenerateislimite

7、dandincomplete．Thevariationinthegapwise(thickness)dimensionofthephysicalquantitieswiththeexceptionofthetemperature，whichissolvedbyfinitedifferencemethod，isneglected．Withthedevelopmentofmoldingtechniques，molded67partswillhavemoreandmorecomplexgeometryand

8、thedifferenceinthethicknesswillbemoreandmorenotable，sothechangeinthegapwise(thickness)dimensionofthephysicalquantitiescannotbeneglected．Inaddition，theflowsimulatedlooksunrealisticinasmuchasthemeltpolymerflowsonlyonsurfacesofcavit