水下爆炸载荷作用下环肋加筋圆柱壳结构的弹塑性动力屈曲

为研究水下爆炸载荷作用下潜艇结构的动力屈曲现象,以潜艇耐压结构的简化模型环肋加筋圆柱壳结构为研究对象,建立流固耦合有限元分析模型,应用瞬态有限元分析程序MSC.Dytran对该结构在水下爆炸冲击载荷作用下的弹塑性动力屈曲行为进行研究,基于Budiansky-Roth准则和Southwell方法确定环肋加筋圆柱壳结构的临界屈曲载荷,讨论结构动力屈曲的影响因素如载荷强度、网格密度、径厚比、长径比、加筋截面间距、加筋尺寸等对环肋加筋圆柱壳结构动屈曲模态和临界屈曲载荷的影响。结果表明:采用建立的流固耦合有限元分析模型,应用动力瞬态有限元软件MSC.Dytran可以对加筋圆柱壳结构的动力屈曲行为进行模拟,模型网格尺寸大小、结构几何参数对结构的动力屈曲临界载荷都有一定的影响,其中加筋圆柱壳结构的径厚比对结构的动力屈曲临界载荷影响最为显著。

Dynamic bulking of a ring-stiffened cylindrical shell subjected to underwater explosive loading

Inordertoinvestigatetheelastic-plasticbulkingofasubmarine,anexistentsimplifiedmodelforasubmarine,namelythering-stiffenedcylindricalshell,waschosenasthesimulationobject,andafluid-solidcouplingmodelwasbuiltbyusingthenonlinear,explicittransientdynamiccode,MSC.Dytrantoexploretheelastic-plasticbulkingofthering-stiffenedcylindricalshellsubjectedtounderwaterexplosionload.ThecriticaldynamicbulkingloadwasobtainedbyusingtheBudiansky-RothruleandtheSouthwellmethod.Andthefollowingfactorswerediscussed:loadintensity,meshdensity,radius-to-thicknessratio,length-to-radiusratio,ribspacingandribsizewhichinfluencingthedynamicbucklingmodeandthecriticalbucklingloadofthering-stiffenedcylindricalshellsubjectedtounderwaterexplosiveloading.Thesimulatedresultsshowthatthebuiltfluid-solidcouplingmodelcanbeusedtosimulatethedynamicbulkingofthering-stiffenedcylindricalshellbycombiningMSC.Dytran.Andthemodelmeshsizeandthestructuralparametershaveacertaininfluenceonthecriticaldynamicbucklingload,inwhichtheradius-to-thicknessratiohasmoreobviousinfluence.