水下爆炸作用下多舱室结构的动力响应及损伤特性

The underwater blast tests of multi-cabin structures are conducted to investigate the effects of underwater blast load intensity and blast distance on the damage characteristics of multi-cabin structures under near-surface conditions. The numerical simulation method of S-ALE structured fluid-structure coupling is used to analyze the transfer distribution of flow field pressure load, and the dynamic response and damage characteristics of structures during the near-surface blast. The damage mechanism of underwater blast lioad against multi-cabin structures is claritied based on the numerical simulations of different blast intensities and distances, and the proportion of work done by shock wave and bubble load during the change of blast distance is obtained. The dynamic response characteristics and damage modes of multi-cabin structures under blast load are summarized. The result show that the multi-cabin structure produces the coupled damage forms, such as shear breach, tearing, depression plastic deformation, crush buckling, etc. The damage discontinuity and nonlinear deformation of the structure damage cause the asymmetric expansion motion of explosion bubble, resulting in the pressure distribution in the compartment showing shock wave characteristics and quasi-static characteristics; the shock wave and bubble load together cause the local damage and overall response of multi-cabin structure, and the bubble load induces the structural kinetic energy growth of about 50% or more.