彈體毛坯收口工藝有限元分析及反向模擬技術(shù)的探索與研究.pdf

1、重慶大學(xué)碩士學(xué)位論文彈體毛坯收口工藝有限元分析及反向模擬技術(shù)的探索與研究姓名：尹紅靈申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料加工工程指導(dǎo)教師：周杰李先祿20000301取慶人學(xué)碩十學(xué)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