不完整殼體的屈曲及其可靠性分析.pdf

1、“————工學碩士學位論文《％：——％一不完整殼體的屈曲及其可靠性分析碩士研究_一指導教師學科、專業(yè)學位論文主審人周勇安偉光教授結(jié)構(gòu)工程干振清教授哈爾濱I程大學2007年5月哈爾濱T稃大學碩十學位論文AbstractIntheprocessingandmanufacturingprocess，therewillinevitablybesomeinitialimperfectioninthemembersoftheactualengine

2、eringstructureAndtherewillbclocaldamagewhentheacturalstructureintheprocessoftheu∞ThestructurewithintialimperfectionandlocalizeddamageisimperfectstructureInthedesignconstructionandu∞ofthestructureitiscrucialthatthestructu

3、rehassufficientstrengthInordertodothis，uncertaintyanalysisofthepastandreliabilityanalysisoftheperfectstructurealenotenou曲WeneedfurtherresearchonimperfectstructuralreliabilityproblemsThisthesiscarriedouttheresearchofiniti

4、alimperfectioninfluenceandlocalizeddamageinfluenceonthinshellstructuralreliabilityBasedonthestudyofanumberofreferences，theanalyticalsolutionofbucklingloadofthinwallcylindershellloadedaxiallywithlocalizedimperfectionWasde

5、rivedBasedonthisanalyticalsolution，thesafetym缸舀nequationofcylindershellwithlocalizedimperfectionWasfoundedAccordingthetypicaldepressionmodelofthecylindershellimpactedorcrashedbythecollisionthesafetymarginequationofcylind

6、ershellwithlocalizeddamageWasfoundedAndthereliabilityanalysisofthecylindershellwithintialimperfectionandlocalizeddamageWascarriedoutInthisthesis，finiteelementmethodWasusedtostudytheultimatestrengthofpressuresphericalshel

7、lsTheultimatestrengthofpressuresphericalshellsunderdifferentthicknessradiusisstudied，aswellastheeffectoftheinitialimperfectionFinallycriticalbucklingsafetymarginofthinhemisphereshellstructurewithinitialimperfectionundere