船舶結(jié)構(gòu)在流-固沖擊作用下的動(dòng)力屈曲.pdf

1、分類號(hào)：——UDC：——V780122密級(jí)：——編號(hào)：——工學(xué)碩士學(xué)位論文船舶結(jié)構(gòu)在流固沖擊作用下的動(dòng)力屈曲碩士研究生：彭誠洋指導(dǎo)教師：戴仰山教授學(xué)位級(jí)別：工學(xué)碩士學(xué)科、專業(yè)：船舶與海洋結(jié)構(gòu)物設(shè)計(jì)制造所在單位：船舶工程學(xué)院論文提交日期：2005年2月論文答辯日期：2005年2月學(xué)位授予單位：哈爾濱工程大學(xué)哈爾濱J：程大學(xué)碩士學(xué)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