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

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

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。

In order to investigate the elastic-plastic bulking of a submarine,an existent simplified model for a submarine,namely the ring-stiffened cylindrical shell,was chosen as the simulation object,and a fluid-solid coupling model was built by using the nonlinear,explicit transient dynamic code,MSC.Dytran to explore the elastic-plastic bulking of the ring-stiffened cylindrical shell subjected to underwater explosion load.The critical dynamic bulking load was obtained by using the Budiansky-Roth rule and the Southwell method.And the following factors were discussed： load intensity,mesh density,radius-to-thickness ratio,length-to-radius ratio,rib spacing and rib size which influencing the dynamic buckling mode and the critical buckling load of the ring-stiffened cylindrical shell subjected to underwater explosive loading.The simulated results show that the built fluid-solid coupling model can be used to simulate the dynamic bulking of the ring-stiffened cylindrical shell by combining MSC.Dytran.And the model mesh size and the structural parameters have a certain influence on the critical dynamic buckling load,in which the radius-to-thickness ratio has more obvious influence.