双层壳体在冲击载荷作用下的动力响应分析

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1、西南交通大学硕士学位论文双层壳体在冲击载荷作用下的动力响应分析姓名：王怡月申请学位级别：硕士专业：工程力学指导教师：赵华20070501西南交通大学硕士研究生学位论文第1I页AbstractImpactisalwaysneedtobeconsideredwhiledesigningandanalyzingshellinengineering,soithassignificantpracticingmeaningtostudytheplasticdynamicissueofthedouble-layersshellmodelunderthehigh·speedpulsei

2、mpact．Inthispaper,allexperimentofpulseimpactingonLYl2aluminumalloyunderthehigh-speedhasbeendesignedandimplemented．Theexperimentaldatahasbeencollectedandanalyzed．Thematerialch盯acterisficoftheLYl2aluminumalloyunderthehigh-speedpulseimpactby52m／sor32m／shavebeenobtained．Byintroducingtwotarge

3、t’srigidityandtwobullet’sinitialvelocity52m／sand32m／s，theimitatingcalculationhasbeenmadefortheplasticdynamicissueofthedouble-layersshellmodelunderthehigh-speedpulseimpacting．TheLagrangeanalyzerofexplidtintegralmethodofdynamicLimitedElementsisappliedtothecalculation．Theresultpresentsthere

4、lationsamongthestructuraldisplacement，speed，acceleration，stress，strainandtimeoftheexteriorshell，themiddleshellandtheinsidesolidofdouble·layersshellundertheimpactintheaxis·direction，andshowstheevolvementp／ocessofstructureofdouble—layersshellunderthehigh-speedImpactintheaxis-direction。Afte

5、ranalyzingtheprototype’sstructural，andconsideringthetheoryofenergy’sdissipationofmaterialunderthehigh-speedpulseimpact，theoptimizeddesignofprototype’sstructuralhasbeendesignedtosatisfythedefendinginsidesolidandeconomizematerial．Threestructuremodelshavebeenmadeandtheimitatingcalculationof

6、impactingontwokindsofrigidity’stargethasbeenimplementedforeachofthemundertwohigh—speedpulseimpactsintheaxis·direction．Thestressandsffainvalueandtheirdistributionoftheexteriorshell，themiddleshellandtheinsidesolidundereverytime，achievetherelmionsamongthestructuraldisplacement，speed,西南交通大学硕

7、士研究生学位论文第1ll页accelerationandtimeoftheinsidesolidofthreedouble-layersshellundertheimpactintheaxis-dire圮tionhavebeenobtained．Andthedynamicdevelopmentalprocessofdouble-layersshellmodelunderfourexteriorloadshasbeengained．Byanalyzingandcontrastingtheoutcomeoffourspeciesnumeric