轻质夹层复合结构稳定性及冲击性能分析

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1、西北工业大学硕士学位论文轻质夹层复合结构稳定性及冲击性能分析姓名：李毅申请学位级别：硕士专业：固体力学指导教师：王生楠20070309西北I业大学硕士学位论文AbstractWiththedevelopmentoftechnology,sandwichstructuresal'eabroadusedtoachievelightweightandsoundinsulation．Intrafficfield,honeycombsandwichandfoamsandwichareusedtosupporcthemainforce．Suchas：n圮

2、headclatstofmagnetieallylevitatedtrainismadeupoftwolargesandwicheswithcomplexshapeandjoint，supportedstructuresandthebodycrustisthesalne．Duetohighspeed(300—500km／h)，theaerodynamicpressureontrainislarge,especiallywhentwotrainencounterorgointothetunnel．theinstaneeisworse。Thent

3、hesandwicheswereinpressurefield，SOit’Snecessarytostudythestabilityofsandwiches．Atthesametime，thestonestrikeoffoamsandwichiSserious．11mS，theimpactofsandwichesandthestabilityofsandwichwithdamageshouldbestudied．Accordingtopracticalproblemabove，inthispaperwestudytheclosed-cellf

4、oamsandwich,thecoreofwhichiSPMIfoam；anddiSCusSthelinear,non．1inearstability,theinfluencesoftheelasticmodulusofcore，facesheetandthethicknessratiooffacesheettocore011thebucklingofsandwichshellwithfoamcore；theimpactofsandwich；thestabilityofsandwichwimdamage．Theexploratoryworks

5、inthisPaperarefollowing．i．Accordingtostrengththeoryandstressanalysisofsandwichwellsecompositetheorytogetconstitutiveequationofsandwich。Then．wemodifythestiffnessofshellelement．andweusetheshellelementwithmodifiedstiffnesstoanalyzethestabilityofsandwich．Lastlyweprovethattheshe

6、llelementwithmodifiedstiffnessCallsimulatesandwichwithfoamcoreeffectively．ii．Wjusedtheshenelementwithmodifiedstiffnesstostudythenon．1inearstabilityofsandwichanddiscussedtheinfluencesoftheelasticmodulusofCOre，facesheetandthethicknessratiooffacesheettocoreonthebucklingofsandw

7、ichshellwithfoamcore．Somesuggestionstoenhancethestabilityofsandwichshellwithfoamcorearethendrawnout．iii．WestudiedthestoneimpactofsandwichwithPMIcore．summarizedthespecialdamagesduetoweakcore．DevelopedtheFEmodelofsandwichwitIldamage，andcarriedoutthenon-linearstabilityanalysis

8、ofsandwichwithdamages．Atlast．wediscussedtheinfiuencesofthedamagesonstabilityofsand