欢迎来到天天文库
浏览记录
ID:37349644
大小:3.84 MB
页数:102页
时间:2019-05-22
《轻质夹层复合结构稳定性及冲击性能分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
此文档下载收益归作者所有