金屬蒙皮連接抗剪性能的分析研究.pdf

1、Y1039831分類號：丑』三絲密級：——UDc：24學號：Q3Q25⑨東南大學碩士掌位論文金屬蒙皮連接抗剪性能的分析研究研究生姓名：隆娟蝗導師姓名：趕戇壬熬授申請學位級別亟學科專業(yè)名稱結掏王擺論文提交日期星鯉壁壘璺且墨旦論文答辯日期gQQ曼生墨目至曼旦學位授予單位塞畝盍堂學位授予日期星鯉量生縣旦答辯委員會主席蠱塞評閱人2006年05月日摘要SHEARBEHAVIoRoFCoNNECTIoNSINMETALSⅪNDIAPHRAGMGra

2、duate：ChenJuantingSupervisor：ProfShuCanpingSoutheastUniversityABSTRACTWiththedevelopmentofsteelstructuresmetalskindiaphragmstructurehasbeenwidelyusedincivilengineeringAndthestructurestylesarcbecomingmoreandmorediverseThe

3、metalsheetingisconnectedwiththemainstructurebyconnections。TheinplanestifinessofmetalsheetingtakestheeffecfofskindiaphragmintoeffectsFurthermoretheinplanestressstateofmetalskindiaphragminducethattheconnectionsmainlybearth

4、esbear10adThenbasedonconclusionofachievementsofformerresearchersthedissertationmainlystudiedtheshearbehaviorofconnectionsinmetaiskindiaphragmBecauseofthevarietyofconnectionsinskindiaphragmthedissertation，throughcarefuIco

5、mparisonandselection，finallychoosestwotypesofconnection，selftappingscrewconnectionandresistancespotweldconnection，asstudyoNectsforfiniteelementmethodanalyzingThemaiorworkcontainsthefollowing：1Setup3Dsolidmodelstosimulate

6、theconnectionsForselftappingscrewconnection，materialnonlinearandcontactnonlineareffectsareincludedintheanalysisForresistancespotweldconnection，residualstressiscalculatedfirst；thenthefiniteelementanalysisincludingmaterial

7、nonlinearityandcontactnonlinearityiscarriedout2Oblainthefailuremodesofbothtypesofconnectionsbyanalyzinga】a坦enumberofexamplesForselftappingscrewconnection，therearethreefailuremodes：④Theholeinthethinnerplateiselongatedandt

8、heslippagebetweenthetwoplatesismoreseriousroftenfoundinconnectionbetweenathinandathickplate)④Thescrewiswrythesideofplateistilting，andtheedgeofholeissquished(oftenfoundinconnectionbetweentwothinplates)⑧Thescrewbecomesobvi

9、ouslyleanthesideofplatebecomestiltingandthescrewjspulledoutbecauseofthebrokenscrewthread(oftenfoundjoconnectionbetweentwothickplates)Forresistancespotweldconnection，therearealsothreefailuremodes(i3Thethinnerplateistorewi

10、thoutobviousdisplacementordeformationinthemodel(oftenfoundinconnectionbetweenathinplateandathickone)②ThesteelplatefailsbecauseofbendingTheedgeofthenuggetfailsbecauseoftensionandshearingAndthedeformationofthemodelisextrem

11、elysevere(oftenfoundinconnectionbetweentwothinplates)(墨)Thenuggetfailsbecauseofshearingwithcrimpleofthebackedgeandobviousdisplacement陽ftenfoundioconnectionbetweentwothickplates)3Accordingtotwotypesofconnections，loaddefle

12、ctioncur∞s(P—Acurves)withdifferentthicknessplatesanddifferentdiametersnuggetsarcobtainedrespectivelyAndthecurvesshowthatmostmodelspresentductilefailure，andtheconnectionstrengthandstiffiaessincreasewiththethicknessofthepl

13、atesandthediameteroftheconnection4Accordingtotheregularityoftheconnectionstrengthandstifinesscurvesusing1eastsquaremethodandbasedontheoriginalempiricalfommlas，thisdissertationproposesformulasforcalculatingconnectionstren

14、gthandsti確CSS，Theformulashaveaguaranteeratiou口to95percentandthascanbedirectlyusedinpracticalengineerdesignFurthermore，theseformulashaveuniformfotreatsdespiteofthicknessdifiercocesinconnection，whichstronglyembodiesrationa

15、lityandcontinuityInthisdissertationthereare5formulasforselftappingscrewconnectionandresistancespotweldconnectionComparedwithforeignempiricalones，formulasfromthedissertationgainfiniteelementresultsthataremuchclosertothete

16、stdataAnditcanaiseflectsomeregularitythattheyareHaabletoKeywords：metalskindiaphragm，shearbehaviorselftappingscrewconnection，contactanalysis，resistancespotweldconnection，residualstress，connectionstiffness，connectionstreng