环肋圆柱壳在水下爆炸冲击下的响应

针对水下非接触爆炸问题过程复杂、计算速度慢的问题,本文以一环肋圆柱壳为例,基于以内嵌的水下爆炸载荷计算方法和声-结构耦合方法为关键技术的水下爆炸分析法(AUA),对其水下爆炸冲击下的响应进行了分析。结果发现,壳板厚度对圆柱壳的水下非接触爆炸响应有较为显著的影响,随着壳板厚度的增加,环肋圆柱壳最大位移减小的幅度逐渐变小。在爆炸初期爆距对环肋圆柱壳冲击响应的影响不大,随时间的推移这种影响逐渐增大,环肋圆柱壳各测点变形随爆距的增大线性减小;当肋骨间距大于0.25倍环肋圆柱壳长时,环肋圆柱壳最大变形量可减小90%;继续减小肋骨间距,环肋圆柱壳最大变形减少量并不明显,说明肋骨对其附近测点和中间的板壳起到了显著的加强作用,肋骨间距为0.25倍环肋圆柱壳长时为最经济的肋骨布置方式。

The response of a stiffened cylindrical shell subjected to underwater explosion

Aiming at the problem of underwater non-contact explosion process is complicated,the calculation speed is slow,this paper takes a ring stiffened cylindrical shell for example,coupled with embedded underwater explosion load calculation method and structure method based on key technology of underwater explosion analysis(AUA),in response to the underwater explosion under the impact of the analysis results show that the shell thickness of the cylindrical shell of the underwater non-contact explosion response has a significant impact,with the increase of the shell thickness,the maximum displacement amplitude of ring stiffened cylindrical shell decreases gradually.Little impact from the response of ring stiffened cylindrical shell shock explosion in the initial explosion,gradually increased with the passage of time effect,ring stiffened cylindrical shell of the measuring point deformation decreases linearly with blast distance increases;when the frame spacing is 0.25 times larger than the ring stiffened cylindrical shell length,the maximum deformation of ring stiffened cylindrical shell can be reduced after 90%.Continued reducing frame spacing,the maximum deformation of ring stiffened cylindrical shell to reduce the amount that is not obvious;the ribs at the measuring point and the middle shell plays a significant role in strengthening;frame spacing is 0.25 times as long as the ring stiffened cylindrical shell with ribs arranged the most economical way.