船舶結構在流-固沖擊作用下的動力屈曲.pdf

1、分類號：——UDC：——V780122密級：——編號：——工學碩士學位論文船舶結構在流固沖擊作用下的動力屈曲碩士研究生：彭誠洋指導教師：戴仰山教授學位級別：工學碩士學科、專業(yè)：船舶與海洋結構物設計制造所在單位：船舶工程學院論文提交日期：2005年2月論文答辯日期：2005年2月學位授予單位：哈爾濱工程大學哈爾濱J：程大學碩士學位論文Abstract—Bucklingisonekindofimportantfailurerood@＼ofs

2、hipstructures，whichdeservesnoticeespeciallywhenslammingisinvolvedShipstructuresalwaysbuckleonthefollowingtwooccasionsOneisthebucklingoflocalstructureswhensubjectedtocompressioncausedbyslammingdirectlyTheotheroneistheposs

3、iblebucklingofshipstructuresundertotalstresseswhenshiphullfluttersSofarmostoftheresearchesonshipstructuralbucklingaremadebyassumingthattheloadsactedontheshiparestaticHowevernearlyeverykindofloMtheshipencounteredduringits

4、lifeisdynamicinnature，SOitismorerationaltodiscussshipstructuralstabilitybasedondynamicbucklingtheoriesStaticbucklingisuptothevalueofactingload，whiledynamicbucklingdependsnotonlyonthevalueofloads，butalsoonsomeotherfactors

5、，suchasthefrequencyandthedurationofloading，theinitialimperfectionsandSOonBasedonthebasicequationsofdynamicbuckling，perturbationMethodandGalerkinMethodareadoptedtoanalyzethedynamicelasticbucklingofbeamand蜘堪platesubjectedt

6、osolid—fluidimpactrespectivelyandcomputercodes腿simplifiedmethodisthenproposedtosolvebasedontherelatedpapersTheresultsshowthissimplifiedmethodissimpleandpracticalenoughtoanalyzedynamicelastic—plasticbucklingofbeamWhentheB

7、—Rcriterionofbucklingisapplied，themaximumdisplacementisevaluatedateveryload—stepofdifferentpeakvaluesofimpacts，thenacharacteristiccurveofdynamicbucklingisplottedbasedonthemaximumdisplacement，fromthecurveadynamicbucklingl

8、oadisdeterminedInthispapertheinfluencesofinitialgeometricimperfections，aswellasthedurationofloadingonthedynamicbucklingloads，areinvestigatedandfinallysomeusefulconclusionsarereachedKeywords：DynamicBuckling；SimplifiedMeth