彈塑性材料中的空穴膨脹理論及其在侵徹力學中的應(yīng)用.pdf

1、中國科學技術(shù)大學碩士學位論文彈塑性材料中的空穴膨脹理論及其在侵徹力學中的應(yīng)用姓名：周輝申請學位級別：碩士專業(yè)：工程力學指導(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