彈體毛坯收口工藝有限元分析及反向模擬技術的探索與研究.pdf

1、重慶大學碩士學位論文彈體毛坯收口工藝有限元分析及反向模擬技術的探索與研究姓名：尹紅靈申請學位級別：碩士專業(yè)：材料加工工程指導教師：周杰李先祿20000301取慶人學碩十學何淪史AbstractThedissertationemploysthecomputernumericalanalysismethod————一thefiniteelementmethod(FEM)，combiningthefacmalcharacteristicsof

2、themetalformingprocessesmhightemperature，demonstratesindetailther弛dvisco—plasticfiniteelementme出odinaxisymmetricisothermalfor西ng，andintroducedthebasictheoryofvisco—plasticFEM，thecharacteristicofshellnosing，thedegreeofstr

3、ainandthestressedstateThisdissertationhassimulatedthepresentformingprocessoftheshellnosingbythefinite—dementmethodTheshellwasmanufacturedinsomewhatfactoryThereincludedcreationofFEMmodels，computation，analysisofresults，whi

4、chprovidedtheparametersofprocessfortheproductionoflargeshellsAndanalyzedtheshellnosingandthedefectswhichappearinshellintheoryputforwardtheparameterswhichaffectshellnosingprocessSuchasfrictionfactordeformationvelocityandt

5、emperaturedistributionTheeffectivestressandstraindistributionandthevelocityfieMandformingloadsinshellblankobtainedthroughrigidvisco—plasticFEM，andcanpredictthedefectsthatprobablyappearinshellThereasonableparametersofproc

6、esshaveobtainedTheresultsinstrucmdtheproductionandexperimentoftheshellblankandshortenedthecycleofproductionandexperimentFormoreconsummatingandoptimizationtheprocessparameters，someresearchesandexplorationsaboutbackwardsim

7、NationhavebeencarriedthroughThekeytechnologyofbackwardtracinghasdiscussedTherearcthetreatmentofinitialworkhardening，theselectionanddeterminationofboundarycondiHon，thechoseofpreformconfigurationandthedeterminationofthenum