超高速碎片云撞击下薄板变形与撕裂建模研究

In order to study the deformation and failure of the thin plate under impact of debris cloud in the multi-layer structure, a series of hypervelocity impact experiments on multi-layer structure are carried out. The experimental results showed that typical failure characteristics of the thin plate under impact of the high-speed debris cloud are central perforation, deflection and petalling. Considering the effect of bending moment and membrane force, an ideal rigid-plastic annular plate deflecting model is established, which can be used to describe large deflection of a thin plate under the strong axisymmetric impact load. The transverse and radial velocity fields of the thin plate under the strong axisymmetric impact load can also be calculated by the established ideal rigid-plastic annular plate deflecting model. With the Grady fragmentation theory, the number of petals can be calculated. The theoretical calculation result is consistent with the experiment. The research results can provide a basic theory for the damage assessment of the multilayer structure under the impact of hypervelocity projectiles.