An experimental and analytical investigation is conducted to study the underwater interaction of implosion pressure pulses with large plates. Two plates with stiffnesses significantly apart are investigated experimentally in a large-diameter pressure vessel for their Fluid-Structure Interaction (FSI) phenomena during proximal implosions of thin metallic shells. High-speed photography, in conjunction with 3D Digital Image Correlation (DIC) measurements, is employed to obtain full-field displacements of the plates. Local dynamic pressure histories are also simultaneously recorded to investigate the incident, reflected and transmitted fluid pressures across the plates during dynamic loading. The lesser stiffness plate showed higher deflection, allowed a weaker reflected pressure pulse and allowed a stronger transmitted pressure pulse as compared to the higher stiffness plate. The peak deflections of the plates occurred during the underpressure phase of the implosion event. Four analytical modeling iterations with increasing complexities starting from Taylor's FSI model are considered to assess the response of water backed plates to dynamic pressure pulse loadings. Each iteration is analyzed individually in an experimental context to understand its role as a building block in a final analytical model. The final model developed is based on the classical plate-bending equation and fluid velocity corrected for ‘afterflow’ effects and performed better than Taylor's original model in predicting pressure-time history of the plates’ reflected pressure and transmitted pressure. The plates’ mid-point deflection profiles are also better predicted using this model. Furthermore, the model showed that the response of a plate during a dynamic implosion pressure pulse interaction is weakly dependent on its bending stiffness. Instead, it is observed that for a large plate, its areal mass density is the dominant factor in determining the reflected pressure, the transmitted pressure and the plate mid-point deflection profiles.

进行了实验和分析研究，以研究内爆压力脉冲与大板块的水下相互作用。在大直径压力容器中，对两个刚度明显分开的板进行了实验研究，以了解它们在薄金属壳近端内爆期间的流固耦合（FSI）现象。高速摄影结合3D数字图像相关性（DIC）测量，可用于获得印版的全视场位移。同时还记录局部动态压力历史记录，以研究动态加载过程中穿过板的入射，反射和传输的流体压力。刚度较小的板显示较大的挠度，与较高的刚度板相比，它允许更弱的反射压力脉冲并允许更强的透射压力脉冲。板的峰值挠度发生在内爆事件的负压阶段。从泰勒的FSI模型开始，四个分析模型迭代的复杂性不断提高，以评估背水板对动态压力脉冲载荷的响应。每次迭代均在实验环境中进行单独分析，以了解其在最终分析模型中作为构建块的作用。开发的最终模型基于经典的板弯曲方程式，并针对“余流”效应对流体速度进行了校正，在预测板的反射压力和传递压力的压力-时间历史时，其性能优于泰勒的原始模型。使用此模型还可以更好地预测板的中点偏转曲线。此外，该模型表明，板在动态内爆压力脉冲相互作用过程中的响应在某种程度上取决于其弯曲刚度。取而代之的是，对于一块大板，观察到其面积质量密度是确定反射压力，传递压力和板中点挠曲曲线的主要因素。