彈塑性材料中的空穴膨脹理論及其在侵徹力學(xué)中的應(yīng)用.pdf

1、中國(guó)科學(xué)技術(shù)大學(xué)碩士學(xué)位論文彈塑性材料中的空穴膨脹理論及其在侵徹力學(xué)中的應(yīng)用姓名：周輝申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：工程力學(xué)指導(dǎo)教師：文鶴鳴20040501AbstractAnunderstandingoftheresponseofstructuresubjectedtointensedynamicloadingswhichproducelargeplasticdeformationandfailureisofgreatsignificanc

2、eforsafetycalculationandassessmentinavarietyofengineeringInparticularpenetrationandperforationofsolidsareveryimportantfordefenseandprotectiontechnologiesCavityexpansionapproximationiswidelyusedasanimportanttheoreticalmet

3、hodtosimplifythetargetanalysis，whichcartcombineempirical，analyticalandcomputationalmethodsinpenetrationandperforationproblemsAstudyiscarriedoutonthedynamiccavityexpansionofmetallicmaterials，Differentmaterialsconstitutive

4、relationshipsanddeformationmodesareconsideredandtheirinfluencesonthedynamiccavityexpansionareexaminedInparticulartheeffectofexpansionmodesandmaterialspropertiessuchascompressibilityandplasticstrain—hardeningisdiscussedon

5、dynamiccavityexpansionmodelsandpenetrationanalysisInregardtotheoreticalstudydynamicsphericalandcylindricalcavityexpansiontheoriesbasedonbilinearandtrilinearelastic—plasticmateriallawsarepresentedanddiscussedAccordingtOth

6、ekineticsequations，massandmomentumconversationequationsinregionsandboundaries，theelasicplasticinterfaceexpansionvelocityradialstresssoncavitysurfaceandtheprofileofradialstressintargetsarefirstdeducedbysimilaritytransform

7、ationClosed—formsolutionsareobtainedforincompressiblemodelsanddetailednumericalprocedureisdiscussedforcompressiblemodelsRobustandaccuratecomputationprogramsaredevelopedbasedonAdams—BashforthmethodFinallysolutionsarediscu

8、ssedintermsofthedifferentcavityexpansionmodelsandmaterialsparametersComputationalefficiencyisalsodiscussedfordifferentmodelsobtainedBasedonthecavityexpansionmodels，penetrationandperforationequationsarederivedTheeffectsof

9、projectilenoseshapesarestudiesonthepenetrationandperforationofmetallictargets，anddominantfactorsinthepenetrationandperforationprocessarediscussedComparisonsaremadebetweentheoreticalpredictionandavailableexperimentaldataa